Linq nested list select

x2 if you want to output all permutations you could use nested loops like var result = new List<string>(); foreach (var s1 in list1) foreach (var s2 in list2) result.Add($"{s1}{s2}"); Using SelectMany you can do the same operation asc# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;Sep 14, 2018 · C# Linq Contains Method. Csharp Programming Server Side Programming. To check for an element in a string, use the Contains () method. The following is our string array. string [] arr = { "Java", "C++", "Python"}; Now, use Contains () method to find a specific string in the string array. arr.AsQueryable ().Contains (str); Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. Browse other questions tagged c# linq entity-framework ienumerable or ask your own question. The Overflow Blog How sharding a database can make it fasterLinq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...Jul 07, 2009 · 3 LINQ to XML-选择一个强类型对象(VB) - LINQ to XML - select to a strongly typed object (VB) 这不是什么大问题,但困扰了我。 我知道如何选择一个强类型的集合(List(Of T),但是我找不到一个整洁的方法来为不是List的对象执行此操作。 EF Core nested Linq select results in N + 1 SQL queries c# entity-framework-core linq select-n-plus-1 sql-server. Question. I have a data model where a 'Top' object has between 0 and N 'Sub' objects. In SQL this is achieved with a foreign key dbo.Sub.TopId.LINQ Method Syntax. In the previous section, you have learned about LINQ Query Syntax. Here, you will learn about Method syntax. Method syntax (also known as fluent syntax) uses extension methods included in the Enumerable or Queryable static class, similar to how you would call the extension method of any class. Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. The Role of the Subquery. Typically, there are three places I use subqueries when writing SQL. First, in the Select clause, I'll use a subquery to add a new item to the select list. This query adds the total sales in Canada to the information about each Customer in Canada: Select custId, totalPurchases, (Select Sum (totalValue) From Orders ...c# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;Compound from Statements. Here is an example that begins to show the power of LINQ. It uses a compound from statement to access a sequenced member of an object. The select clause is being used to transform the result into a sequence of integers. Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. The Role of the Subquery. Typically, there are three places I use subqueries when writing SQL. First, in the Select clause, I'll use a subquery to add a new item to the select list. This query adds the total sales in Canada to the information about each Customer in Canada: Select custId, totalPurchases, (Select Sum (totalValue) From Orders ...Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. Linq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...LINQ - nested where clause c# entity-framework linq. Question. I have a problem with a project. I’m trying to get a list of companies, but only filter those companies that are located in “Stockholm†. ... Entity Framework Using a Where Clause on a Nested Entity The Select for the borrowers I believe would returning the ...Sep 14, 2018 · C# Linq Contains Method. Csharp Programming Server Side Programming. To check for an element in a string, use the Contains () method. The following is our string array. string [] arr = { "Java", "C++", "Python"}; Now, use Contains () method to find a specific string in the string array. arr.AsQueryable ().Contains (str); int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); Problem: List all customers with their total number of orders. SELECT FirstName, LastName, OrderCount = (SELECT COUNT(O.id) FROM [Order] O WHERE O.CustomerId = C.Id) FROM Customer C. Try it live. This is called a correlated subquery because the subquery references the enclosing query, specifically, the C.Id in the WHERE clause. Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); User369345748 posted I have an organisation structure in a query object called Retval , whos structure I am trying to flatten with linq so that I can get a person's name, id & their manager This is the the source Name A,ID 0 Team [ Name B,ID 1 Team[], Name C,ID 2 Team [Name E,ID 3 Team[] · User665608656 posted Hi Richard, According to your description ...Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. 2. How to directly select the same column from all nested lists within a list? User: Lukas | Viewed: 46,011 Tags: r , nested-lists Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. Compound from Statements. Here is an example that begins to show the power of LINQ. It uses a compound from statement to access a sequenced member of an object. The select clause is being used to transform the result into a sequence of integers. User369345748 posted I have an organisation structure in a query object called Retval , whos structure I am trying to flatten with linq so that I can get a person's name, id & their manager This is the the source Name A,ID 0 Team [ Name B,ID 1 Team[], Name C,ID 2 Team [Name E,ID 3 Team[] · User665608656 posted Hi Richard, According to your description ...LINQ SelectMany is a Category of Query Operator which comes under Projection Operators. SelectMany operator used to select the elements from collection of collection called Nested Collection. SelectMany returns a single result from a nested collection; the result contains the concatenation elements for each source value.Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. c# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. LINQ SelectMany is a Category of Query Operator which comes under Projection Operators. SelectMany operator used to select the elements from collection of collection called Nested Collection. SelectMany returns a single result from a nested collection; the result contains the concatenation elements for each source value.You can break down your query into 3 different parts as shown below -. Filter out the OrgUserIds first. var filteredOrgUserIds = dc.OrgUsers.Where (u => dc.OrgRelations.Where (o =>o.ParentOrgId == 10001).Select (d => d.ChildOrgId).ToList ().Contains (u.OrgId)) .Select (uid => uid.OrgUserId) .Distinct () .ToList (); Compound from Statements. Here is an example that begins to show the power of LINQ. It uses a compound from statement to access a sequenced member of an object. The select clause is being used to transform the result into a sequence of integers. example - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: 2. How to directly select the same column from all nested lists within a list? User: Lukas | Viewed: 46,011 Tags: r , nested-lists var c = from d in CustomerOrders select d.OrderLines.ToList(); IEnumerable<string> b = from q in (c as List<OrderLine>) select q.ProductCode; The first line is fine, but the next one causes an exception becase c is null. I didn't even get to trying to find the distinct values from the list :)I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?Dec 09, 2019 · I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... (sections => sections.SideList.Select ... LINQ - nested where clause c# entity-framework linq. Question. I have a problem with a project. I’m trying to get a list of companies, but only filter those companies that are located in “Stockholm†. ... Entity Framework Using a Where Clause on a Nested Entity The Select for the borrowers I believe would returning the ...Problem: List all customers with their total number of orders. SELECT FirstName, LastName, OrderCount = (SELECT COUNT(O.id) FROM [Order] O WHERE O.CustomerId = C.Id) FROM Customer C. Try it live. This is called a correlated subquery because the subquery references the enclosing query, specifically, the C.Id in the WHERE clause. C# answers related to "c# linq distinct group by nested list" select distinct linq mvc; c# linq select from object list; c# distinct array of objects by values.netstandard distinctby iqueryable; c# distinct comparer multiple properties; c# distinct dictionary; C# .NET Core linq Distinct; select distinct two columns entity framework c#Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... if you want to output all permutations you could use nested loops like var result = new List<string>(); foreach (var s1 in list1) foreach (var s2 in list2) result.Add($"{s1}{s2}"); Using SelectMany you can do the same operation asLinq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...Mar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . The following example shows how to create nested groups in a LINQ query expression. Each group that is created according to student year or grade level is then further subdivided into groups based on the individuals' names. ... The example in this topic uses the Student class and students list from the sample code in Query a collection of objects.Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...LINQ: Flatten nested collections with SelectMany - GameDev<T> Handling data structures, we sometimes have to extract and flatten nested collections into a single one. With LINQ, we can use SelectMany() to do just that. Handling data structures, we sometimes have to extract and flatten nested collections into a single one.var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Oct 20, 2016 · Solution 1. Accept Solution Reject Solution. Just change the conditions that you are querying on. I'm converting your FindAll to a Where clause as I know that works for nested queries. I'm also converting this to a method, since as a property the possibility exists that ddlCertificate has a null value, which will cause an exception if the ... Linq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...Compound from Statements. Here is an example that begins to show the power of LINQ. It uses a compound from statement to access a sequenced member of an object. The select clause is being used to transform the result into a sequence of integers. LINQ SelectMany is a Category of Query Operator which comes under Projection Operators. SelectMany operator used to select the elements from collection of collection called Nested Collection. SelectMany returns a single result from a nested collection; the result contains the concatenation elements for each source value.Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. example - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... Oct 20, 2016 · Solution 1. Accept Solution Reject Solution. Just change the conditions that you are querying on. I'm converting your FindAll to a Where clause as I know that works for nested queries. I'm also converting this to a method, since as a property the possibility exists that ddlCertificate has a null value, which will cause an exception if the ... select from a list with field name and field value with linq (similar to select command) I want to select from a dynamic list where the list field name is for example 'SecName'and the SecName value is equal to for example 'xxx', I know how to create it in sql, but I want to create and use it with entity framework. Like Executing String in sql.Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:Oct 20, 2016 · Solution 1. Accept Solution Reject Solution. Just change the conditions that you are querying on. I'm converting your FindAll to a Where clause as I know that works for nested queries. I'm also converting this to a method, since as a property the possibility exists that ddlCertificate has a null value, which will cause an exception if the ... At the moment via linq I get the Race objects (parent objects) but their nested Odds list are empty. Below is an example of my query results. Friday, August 18, 2017 9:54 AMAt the moment via linq I get the Race objects (parent objects) but their nested Odds list are empty. Below is an example of my query results. Friday, August 18, 2017 9:54 AMAt the moment via linq I get the Race objects (parent objects) but their nested Odds list are empty. Below is an example of my query results. Friday, August 18, 2017 9:54 AMLINQ: Flatten nested collections with SelectMany - GameDev<T> Handling data structures, we sometimes have to extract and flatten nested collections into a single one. With LINQ, we can use SelectMany() to do just that. Handling data structures, we sometimes have to extract and flatten nested collections into a single one.Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. LINQ: Flatten nested collections with SelectMany - GameDev<T> Handling data structures, we sometimes have to extract and flatten nested collections into a single one. With LINQ, we can use SelectMany() to do just that. Handling data structures, we sometimes have to extract and flatten nested collections into a single one.var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); LINQ: Flatten nested collections with SelectMany - GameDev<T> Handling data structures, we sometimes have to extract and flatten nested collections into a single one. With LINQ, we can use SelectMany() to do just that. Handling data structures, we sometimes have to extract and flatten nested collections into a single one.EF Core nested Linq select results in N + 1 SQL queries c# entity-framework-core linq select-n-plus-1 sql-server. Question. I have a data model where a 'Top' object has between 0 and N 'Sub' objects. In SQL this is achieved with a foreign key dbo.Sub.TopId.At the moment via linq I get the Race objects (parent objects) but their nested Odds list are empty. Below is an example of my query results. Friday, August 18, 2017 9:54 AMUser369345748 posted I have an organisation structure in a query object called Retval , whos structure I am trying to flatten with linq so that I can get a person's name, id & their manager This is the the source Name A,ID 0 Team [ Name B,ID 1 Team[], Name C,ID 2 Team [Name E,ID 3 Team[] · User665608656 posted Hi Richard, According to your description ...Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. example - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); User369345748 posted I have an organisation structure in a query object called Retval , whos structure I am trying to flatten with linq so that I can get a person's name, id & their manager This is the the source Name A,ID 0 Team [ Name B,ID 1 Team[], Name C,ID 2 Team [Name E,ID 3 Team[] · User665608656 posted Hi Richard, According to your description ...Feb 25, 2014 · C# - LINQ - Flatten nested Lists Enumerable.SelectMany<TSource, TResult> Method (IEnumerable<TSource>, Func<TSource, IEnumerable<TResult>>) Projects each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence. The Role of the Subquery. Typically, there are three places I use subqueries when writing SQL. First, in the Select clause, I'll use a subquery to add a new item to the select list. This query adds the total sales in Canada to the information about each Customer in Canada: Select custId, totalPurchases, (Select Sum (totalValue) From Orders ...LINQ: Flatten nested collections with SelectMany - GameDev<T> Handling data structures, we sometimes have to extract and flatten nested collections into a single one. With LINQ, we can use SelectMany() to do just that. Handling data structures, we sometimes have to extract and flatten nested collections into a single one.LINQ - nested where clause c# entity-framework linq. Question. I have a problem with a project. I’m trying to get a list of companies, but only filter those companies that are located in “Stockholm†. ... Entity Framework Using a Where Clause on a Nested Entity The Select for the borrowers I believe would returning the ... var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); LINQ - nested where clause c# entity-framework linq. Question. I have a problem with a project. I’m trying to get a list of companies, but only filter those companies that are located in “Stockholm†. ... Entity Framework Using a Where Clause on a Nested Entity The Select for the borrowers I believe would returning the ...LINQ: Flatten nested collections with SelectMany - GameDev<T> Handling data structures, we sometimes have to extract and flatten nested collections into a single one. With LINQ, we can use SelectMany() to do just that. Handling data structures, we sometimes have to extract and flatten nested collections into a single one.if you want to output all permutations you could use nested loops like var result = new List<string>(); foreach (var s1 in list1) foreach (var s2 in list2) result.Add($"{s1}{s2}"); Using SelectMany you can do the same operation asMar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. Sep 11, 2013 · LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax: Linq nested or inner query c# entity-framework-core linq. Question. Suppose I have a list of employees and each employee has several projects. I can get a given employee using: ... EF Core nested Linq select results in N + 1 SQL queries I faced the same problem....The solution what you proposed doesn't work for relatively big tables. ...Linq nested or inner query c# entity-framework-core linq. Question. Suppose I have a list of employees and each employee has several projects. I can get a given employee using: ... EF Core nested Linq select results in N + 1 SQL queries I faced the same problem....The solution what you proposed doesn't work for relatively big tables. ...example - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: example - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:c# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;Jun 26, 2017 · Whenever you hear the word projection while writing LINQ or lambda queries, it is nothing but your Select statement. Conclusion. I hope, this article will be helpful to understand how to write complex queries using LINQ or lambda. Please do comment, whether it’s good or bad. Sharing is valuable. Thank you for reading it. Nested select Linq. 8. Reduce or improve Linq query with nested from-where clauses. 4. Efficiency of nested LINQ foreach loops. 3. LINQ filtering query. 5. Efficiency of a linq query on a nested structure. 1. Filter linq query. Hot Network Questions Can a paladin stack Divine Smite, Thunderous Smite, and Wrathful Smite?C# answers related to "c# linq distinct group by nested list" select distinct linq mvc; c# linq select from object list; c# distinct array of objects by values.netstandard distinctby iqueryable; c# distinct comparer multiple properties; c# distinct dictionary; C# .NET Core linq Distinct; select distinct two columns entity framework c#Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. The following example shows how to create nested groups in a LINQ query expression. Each group that is created according to student year or grade level is then further subdivided into groups based on the individuals' names. ... The example in this topic uses the Student class and students list from the sample code in Query a collection of objects.select from a list with field name and field value with linq (similar to select command) I want to select from a dynamic list where the list field name is for example 'SecName'and the SecName value is equal to for example 'xxx', I know how to create it in sql, but I want to create and use it with entity framework. Like Executing String in sql.At the moment via linq I get the Race objects (parent objects) but their nested Odds list are empty. Below is an example of my query results. Friday, August 18, 2017 9:54 AMAt the moment via linq I get the Race objects (parent objects) but their nested Odds list are empty. Below is an example of my query results. Friday, August 18, 2017 9:54 AMLinq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:LINQ SelectMany is a Category of Query Operator which comes under Projection Operators. SelectMany operator used to select the elements from collection of collection called Nested Collection. SelectMany returns a single result from a nested collection; the result contains the concatenation elements for each source value.int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); LINQ Method Syntax. In the previous section, you have learned about LINQ Query Syntax. Here, you will learn about Method syntax. Method syntax (also known as fluent syntax) uses extension methods included in the Enumerable or Queryable static class, similar to how you would call the extension method of any class. The Role of the Subquery. Typically, there are three places I use subqueries when writing SQL. First, in the Select clause, I'll use a subquery to add a new item to the select list. This query adds the total sales in Canada to the information about each Customer in Canada: Select custId, totalPurchases, (Select Sum (totalValue) From Orders ...I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...example - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: Jun 26, 2017 · Whenever you hear the word projection while writing LINQ or lambda queries, it is nothing but your Select statement. Conclusion. I hope, this article will be helpful to understand how to write complex queries using LINQ or lambda. Please do comment, whether it’s good or bad. Sharing is valuable. Thank you for reading it. var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Oct 20, 2016 · Solution 1. Accept Solution Reject Solution. Just change the conditions that you are querying on. I'm converting your FindAll to a Where clause as I know that works for nested queries. I'm also converting this to a method, since as a property the possibility exists that ddlCertificate has a null value, which will cause an exception if the ... Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Linq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...Jun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. Sep 14, 2018 · C# Linq Contains Method. Csharp Programming Server Side Programming. To check for an element in a string, use the Contains () method. The following is our string array. string [] arr = { "Java", "C++", "Python"}; Now, use Contains () method to find a specific string in the string array. arr.AsQueryable ().Contains (str); Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:Mar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . Nov 09, 2016 · Converting nested Dictionary into nested List in linq statementRSS. 1 reply Last post Nov 11, 2016 01:46 ... .Select(x => new Top3Item {Title = x.Key.Description, C# LINQ find duplicates in List. The easiest way to solve the problem is to group the elements based on their value, and then pick a representative of the group if there are more than one element in the group. In LINQ, this translates to: var query = lst.GroupBy (x => x) .Where (g => g.Count () > 1) .Select (y => y.Key) .ToList (); LINQ Method Syntax. In the previous section, you have learned about LINQ Query Syntax. Here, you will learn about Method syntax. Method syntax (also known as fluent syntax) uses extension methods included in the Enumerable or Queryable static class, similar to how you would call the extension method of any class. I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...Mar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . Dec 09, 2019 · I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... (sections => sections.SideList.Select ... Linq: How to flatten a nested list In this post we will see how to flatten collections with nested elements. Let´s imagine that we are developing an application for some kind of learning center: the center offers various class, and every class is imparted by a teacher.Sep 14, 2018 · C# Linq Contains Method. Csharp Programming Server Side Programming. To check for an element in a string, use the Contains () method. The following is our string array. string [] arr = { "Java", "C++", "Python"}; Now, use Contains () method to find a specific string in the string array. arr.AsQueryable ().Contains (str); Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:Browse other questions tagged c# linq entity-framework ienumerable or ask your own question. The Overflow Blog How sharding a database can make it fasterBrowse other questions tagged c# linq entity-framework or ask your own question. The Overflow Blog Getting through a SOC 2 audit with your nerves intact (Ep. 426)Linq: How to flatten a nested list In this post we will see how to flatten collections with nested elements. Let´s imagine that we are developing an application for some kind of learning center: the center offers various class, and every class is imparted by a teacher.I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); Dec 09, 2019 · I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... (sections => sections.SideList.Select ... select from a list with field name and field value with linq (similar to select command) I want to select from a dynamic list where the list field name is for example 'SecName'and the SecName value is equal to for example 'xxx', I know how to create it in sql, but I want to create and use it with entity framework. Like Executing String in sql.First, you'll access the current grouped value as Key in your Select clause:.Select("new (Key as Group, Sum(Value) as TotalValue)"); That should make your query work. The harder question is how to turn the returned objects, which will have a dynamically generated type that inherits from DynamicClass, into a static type. int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); Linq: How to flatten a nested list In this post we will see how to flatten collections with nested elements. Let´s imagine that we are developing an application for some kind of learning center: the center offers various class, and every class is imparted by a teacher.LINQ Method Syntax. In the previous section, you have learned about LINQ Query Syntax. Here, you will learn about Method syntax. Method syntax (also known as fluent syntax) uses extension methods included in the Enumerable or Queryable static class, similar to how you would call the extension method of any class. Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?LINQ SelectMany is a Category of Query Operator which comes under Projection Operators. SelectMany operator used to select the elements from collection of collection called Nested Collection. SelectMany returns a single result from a nested collection; the result contains the concatenation elements for each source value.Mar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . You can break down your query into 3 different parts as shown below -. Filter out the OrgUserIds first. var filteredOrgUserIds = dc.OrgUsers.Where (u => dc.OrgRelations.Where (o =>o.ParentOrgId == 10001).Select (d => d.ChildOrgId).ToList ().Contains (u.OrgId)) .Select (uid => uid.OrgUserId) .Distinct () .ToList (); Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...Jun 26, 2017 · Whenever you hear the word projection while writing LINQ or lambda queries, it is nothing but your Select statement. Conclusion. I hope, this article will be helpful to understand how to write complex queries using LINQ or lambda. Please do comment, whether it’s good or bad. Sharing is valuable. Thank you for reading it. Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... Sql server getting nested results from linq to sql,sql-server,linq,linq-to-sql,Sql Server,Linq,Linq To Sql,my data looks like this in the table: ID Name Parent ID --- ---- ----- 1 Mike null 2 Steve 1 3 George null 4 Jim 1 I can't figure out how to write a linq to sql query that will return the results with the parent rows grouped with their child rows. Sep 14, 2018 · C# Linq Contains Method. Csharp Programming Server Side Programming. To check for an element in a string, use the Contains () method. The following is our string array. string [] arr = { "Java", "C++", "Python"}; Now, use Contains () method to find a specific string in the string array. arr.AsQueryable ().Contains (str); Browse other questions tagged c# linq entity-framework ienumerable or ask your own question. The Overflow Blog How sharding a database can make it fasterI was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?Mar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . Linq nested or inner query c# entity-framework-core linq. Question. Suppose I have a list of employees and each employee has several projects. I can get a given employee using: ... EF Core nested Linq select results in N + 1 SQL queries I faced the same problem....The solution what you proposed doesn't work for relatively big tables. ...C# answers related to "c# linq distinct group by nested list" select distinct linq mvc; c# linq select from object list; c# distinct array of objects by values.netstandard distinctby iqueryable; c# distinct comparer multiple properties; c# distinct dictionary; C# .NET Core linq Distinct; select distinct two columns entity framework c#Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:Nov 20, 2007 · LINQ to Objects: Nested Queries. Posted on November 20, 2007. November 20, 2007. by Pete. LINQ allows us to query our object tree (s) in a much easier and more readable manner than using traditional looping/iteration mechanisms of the past. In this example, I have a Role object which contains a Dictionary (Of Type, List (Of IPermission)) which ... EF Core nested Linq select results in N + 1 SQL queries c# entity-framework-core linq select-n-plus-1 sql-server. Question. I have a data model where a 'Top' object has between 0 and N 'Sub' objects. In SQL this is achieved with a foreign key dbo.Sub.TopId.The following example shows how to create nested groups in a LINQ query expression. Each group that is created according to student year or grade level is then further subdivided into groups based on the individuals' names. ... The example in this topic uses the Student class and students list from the sample code in Query a collection of objects.Browse other questions tagged c# linq entity-framework ienumerable or ask your own question. The Overflow Blog How sharding a database can make it fasterMar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . C# answers related to "c# linq distinct group by nested list" select distinct linq mvc; c# linq select from object list; c# distinct array of objects by values.netstandard distinctby iqueryable; c# distinct comparer multiple properties; c# distinct dictionary; C# .NET Core linq Distinct; select distinct two columns entity framework c# Linq: How to flatten a nested list In this post we will see how to flatten collections with nested elements. Let´s imagine that we are developing an application for some kind of learning center: the center offers various class, and every class is imparted by a teacher.Browse other questions tagged c# linq entity-framework ienumerable or ask your own question. The Overflow Blog How sharding a database can make it fasterexample - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: C# answers related to "c# linq distinct group by nested list" select distinct linq mvc; c# linq select from object list; c# distinct array of objects by values.netstandard distinctby iqueryable; c# distinct comparer multiple properties; c# distinct dictionary; C# .NET Core linq Distinct; select distinct two columns entity framework c#c# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); c# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;Linq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); select from a list with field name and field value with linq (similar to select command) I want to select from a dynamic list where the list field name is for example 'SecName'and the SecName value is equal to for example 'xxx', I know how to create it in sql, but I want to create and use it with entity framework. Like Executing String in sql.int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); Browse other questions tagged c# linq entity-framework or ask your own question. The Overflow Blog Getting through a SOC 2 audit with your nerves intact (Ep. 426)Browse other questions tagged c# linq entity-framework ienumerable or ask your own question. The Overflow Blog How sharding a database can make it fasterFirst, you'll access the current grouped value as Key in your Select clause:.Select("new (Key as Group, Sum(Value) as TotalValue)"); That should make your query work. The harder question is how to turn the returned objects, which will have a dynamically generated type that inherits from DynamicClass, into a static type. Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?Feb 25, 2014 · C# - LINQ - Flatten nested Lists Enumerable.SelectMany<TSource, TResult> Method (IEnumerable<TSource>, Func<TSource, IEnumerable<TResult>>) Projects each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence. Nov 09, 2016 · Converting nested Dictionary into nested List in linq statementRSS. 1 reply Last post Nov 11, 2016 01:46 ... .Select(x => new Top3Item {Title = x.Key.Description, Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... Linq nested or inner query c# entity-framework-core linq. Question. Suppose I have a list of employees and each employee has several projects. I can get a given employee using: ... EF Core nested Linq select results in N + 1 SQL queries I faced the same problem....The solution what you proposed doesn't work for relatively big tables. ...Feb 25, 2014 · C# - LINQ - Flatten nested Lists Enumerable.SelectMany<TSource, TResult> Method (IEnumerable<TSource>, Func<TSource, IEnumerable<TResult>>) Projects each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence. I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... var s1 = SectionList.Select(sections => sections.SideList.Select(sides => sides.PositionList.Where ... Linq query for nested list in C#. How can I add a nested class in a class list?LINQ SelectMany is a Category of Query Operator which comes under Projection Operators. SelectMany operator used to select the elements from collection of collection called Nested Collection. SelectMany returns a single result from a nested collection; the result contains the concatenation elements for each source value.var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...Mar 23, 2016 · Using the two LINQ methods, this can be implemented as follows. var result = first .Zip(second, (f, s) => new Type[] {a, b}) .SelectMany(x => x); As you can see, we first use Zip to take one element from each of the lists, and combine them into a small array of two elements, and then flatten all those arrays using SelectMany . Dec 09, 2019 · I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... (sections => sections.SideList.Select ... Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); The Role of the Subquery. Typically, there are three places I use subqueries when writing SQL. First, in the Select clause, I'll use a subquery to add a new item to the select list. This query adds the total sales in Canada to the information about each Customer in Canada: Select custId, totalPurchases, (Select Sum (totalValue) From Orders ...select from a list with field name and field value with linq (similar to select command) I want to select from a dynamic list where the list field name is for example 'SecName'and the SecName value is equal to for example 'xxx', I know how to create it in sql, but I want to create and use it with entity framework. Like Executing String in sql.example - select linq c# list Выберите выделение, используя linq (3) На этот вопрос уже есть ответ: Sql server getting nested results from linq to sql,sql-server,linq,linq-to-sql,Sql Server,Linq,Linq To Sql,my data looks like this in the table: ID Name Parent ID --- ---- ----- 1 Mike null 2 Steve 1 3 George null 4 Jim 1 I can't figure out how to write a linq to sql query that will return the results with the parent rows grouped with their child rows. LINQ: Flatten nested collections with SelectMany - GameDev<T> Handling data structures, we sometimes have to extract and flatten nested collections into a single one. With LINQ, we can use SelectMany() to do just that. Handling data structures, we sometimes have to extract and flatten nested collections into a single one.First, you'll access the current grouped value as Key in your Select clause:.Select("new (Key as Group, Sum(Value) as TotalValue)"); That should make your query work. The harder question is how to turn the returned objects, which will have a dynamically generated type that inherits from DynamicClass, into a static type. The following example shows how to create nested groups in a LINQ query expression. Each group that is created according to student year or grade level is then further subdivided into groups based on the individuals' names. ... The example in this topic uses the Student class and students list from the sample code in Query a collection of objects.Linq: How to flatten a nested list In this post we will see how to flatten collections with nested elements. Let´s imagine that we are developing an application for some kind of learning center: the center offers various class, and every class is imparted by a teacher.Browse other questions tagged c# linq entity-framework or ask your own question. The Overflow Blog Getting through a SOC 2 audit with your nerves intact (Ep. 426)C# LINQ find duplicates in List. The easiest way to solve the problem is to group the elements based on their value, and then pick a representative of the group if there are more than one element in the group. In LINQ, this translates to: var query = lst.GroupBy (x => x) .Where (g => g.Count () > 1) .Select (y => y.Key) .ToList (); Sep 16, 2019 · LINQ query to filter the movies by selected genres. First, I added a filter for the selected genres (a string array) in Figure 2. The GetMovies () method returns a list of movies. In this case, it’s a just a small collection created within the method, but it could have been retrieved from a database. Next, the genre from the list of movies is ... At the moment via linq I get the Race objects (parent objects) but their nested Odds list are empty. Below is an example of my query results. Friday, August 18, 2017 9:54 AMJun 06, 2021 · Extend python lists operations using .NET's LINQ syntax for clean and fast coding. - GitHub - avilum/linqit: Extend python lists operations using .NET's LINQ syntax for clean and fast coding. Sql server getting nested results from linq to sql,sql-server,linq,linq-to-sql,Sql Server,Linq,Linq To Sql,my data looks like this in the table: ID Name Parent ID --- ---- ----- 1 Mike null 2 Steve 1 3 George null 4 Jim 1 I can't figure out how to write a linq to sql query that will return the results with the parent rows grouped with their child rows. LINQ Method Syntax. In the previous section, you have learned about LINQ Query Syntax. Here, you will learn about Method syntax. Method syntax (also known as fluent syntax) uses extension methods included in the Enumerable or Queryable static class, similar to how you would call the extension method of any class. Show activity on this post. LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax:if you want to output all permutations you could use nested loops like var result = new List<string>(); foreach (var s1 in list1) foreach (var s2 in list2) result.Add($"{s1}{s2}"); Using SelectMany you can do the same operation asc# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;Nested select Linq. 8. Reduce or improve Linq query with nested from-where clauses. 4. Efficiency of nested LINQ foreach loops. 3. LINQ filtering query. 5. Efficiency of a linq query on a nested structure. 1. Filter linq query. Hot Network Questions Can a paladin stack Divine Smite, Thunderous Smite, and Wrathful Smite?2. How to directly select the same column from all nested lists within a list? User: Lukas | Viewed: 46,011 Tags: r , nested-lists The Role of the Subquery. Typically, there are three places I use subqueries when writing SQL. First, in the Select clause, I'll use a subquery to add a new item to the select list. This query adds the total sales in Canada to the information about each Customer in Canada: Select custId, totalPurchases, (Select Sum (totalValue) From Orders ...Dec 09, 2019 · I was some nested list, and I would like to extract complexe information, but I don't know how write the linq expression. ... (sections => sections.SideList.Select ... User369345748 posted I have an organisation structure in a query object called Retval , whos structure I am trying to flatten with linq so that I can get a person's name, id & their manager This is the the source Name A,ID 0 Team [ Name B,ID 1 Team[], Name C,ID 2 Team [Name E,ID 3 Team[] · User665608656 posted Hi Richard, According to your description ...EF Core nested Linq select results in N + 1 SQL queries c# entity-framework-core linq select-n-plus-1 sql-server. Question. I have a data model where a 'Top' object has between 0 and N 'Sub' objects. In SQL this is achieved with a foreign key dbo.Sub.TopId.You can break down your query into 3 different parts as shown below -. Filter out the OrgUserIds first. var filteredOrgUserIds = dc.OrgUsers.Where (u => dc.OrgRelations.Where (o =>o.ParentOrgId == 10001).Select (d => d.ChildOrgId).ToList ().Contains (u.OrgId)) .Select (uid => uid.OrgUserId) .Distinct () .ToList (); Sep 11, 2013 · LINQ expressions can have multiple nested from clauses: // nested from clauses var names = from c1 in myClass1List from c2 in c1.Class2List where c2.Name == "something" from c3 in c2.Class3List select c3.Name; For completeness, here are two variants using method syntax: The following example shows how to create nested groups in a LINQ query expression. Each group that is created according to student year or grade level is then further subdivided into groups based on the individuals' names. ... The example in this topic uses the Student class and students list from the sample code in Query a collection of objects.var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Jun 26, 2017 · Whenever you hear the word projection while writing LINQ or lambda queries, it is nothing but your Select statement. Conclusion. I hope, this article will be helpful to understand how to write complex queries using LINQ or lambda. Please do comment, whether it’s good or bad. Sharing is valuable. Thank you for reading it. User369345748 posted I have an organisation structure in a query object called Retval , whos structure I am trying to flatten with linq so that I can get a person's name, id & their manager This is the the source Name A,ID 0 Team [ Name B,ID 1 Team[], Name C,ID 2 Team [Name E,ID 3 Team[] · User665608656 posted Hi Richard, According to your description ...Linq on a nested List - select all Id's. Ask Question Asked 10 years, 6 months ago. Modified 4 years, 5 months ago. Viewed 43k times 26 8. I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } ...var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...2. How to directly select the same column from all nested lists within a list? User: Lukas | Viewed: 46,011 Tags: r , nested-lists int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); C# LINQ find duplicates in List. The easiest way to solve the problem is to group the elements based on their value, and then pick a representative of the group if there are more than one element in the group. In LINQ, this translates to: var query = lst.GroupBy (x => x) .Where (g => g.Count () > 1) .Select (y => y.Key) .ToList (); I'm not sure what exactly your asking about, but List<T> does implement IEnumerable<T> (which is just an interface for an enumerable sequence).. A code that will do your projection and have Things be a List instead of an IEnumerable would use the ToList() operator, which creates a List<T> from any IEnumerable<T> this:. MyClass myClass = (from MyClassTable mct in this.Context.MyClassTableSet ...C# answers related to "c# linq distinct group by nested list" select distinct linq mvc; c# linq select from object list; c# distinct array of objects by values.netstandard distinctby iqueryable; c# distinct comparer multiple properties; c# distinct dictionary; C# .NET Core linq Distinct; select distinct two columns entity framework c#int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); C# LINQ find duplicates in List. The easiest way to solve the problem is to group the elements based on their value, and then pick a representative of the group if there are more than one element in the group. In LINQ, this translates to: var query = lst.GroupBy (x => x) .Where (g => g.Count () > 1) .Select (y => y.Key) .ToList (); c# linq distinct group by nested list; linq select max value from list; c# find element in list of list; c# check if array contains value; c# get distinct values all fields from list; array reduce c#; c# object is in object list; export list to excel c#; listbox1.remove item c#; c# bubble sort;Compound from Statements. Here is an example that begins to show the power of LINQ. It uses a compound from statement to access a sequenced member of an object. The select clause is being used to transform the result into a sequence of integers. LINQ SelectMany is a Category of Query Operator which comes under Projection Operators. SelectMany operator used to select the elements from collection of collection called Nested Collection. SelectMany returns a single result from a nested collection; the result contains the concatenation elements for each source value.Apr 03, 2022 · LINQ has Enuemerable.Select, does Java have any equivalent?. Say I have some class Record with three fields id, price, itemsSold and a list of these records from which I want to filter out the most popular item measured by which product sold the most items. int[] allRoomIds = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.Room.Id) .ToArray(); If you will need the list of object: List<Room> allRooms = Hotels.SelectMany(h => h.RoomType) .GroupBy(rt => rt.Room.Id) .Select(room => room.First()) .ToList(); Mar 06, 2013 · First select all attributes from all attribute groups, then only select the ones with your property. IEnumerable<Attribute> attributes = myClassInstance .AttributeGroups .SelectMany(x => x.Attributes) .Where(x => x.SomeProperty == 'A'); var distinctUsers = allUsers .GroupBy(x => x.UserId) .Select(x => x.First()) .ToList(); Select operator selects values from a collection whereas SelectMany Operator selects values from multiple collection or nested collection. SelectMany Operator selects values from multiple or nested collection and flatten the result. You can understand Select and SelectMany Operator in LINQ more clearly when you will see the programming example.The following example shows how to create nested groups in a LINQ query expression. Each group that is created according to student year or grade level is then further subdivided into groups based on the individuals' names. ... The example in this topic uses the Student class and students list from the sample code in Query a collection of objects.2. How to directly select the same column from all nested lists within a list? User: Lukas | Viewed: 46,011 Tags: r , nested-lists 2. How to directly select the same column from all nested lists within a list? User: Lukas | Viewed: 46,011 Tags: r , nested-lists select from a list with field name and field value with linq (similar to select command) I want to select from a dynamic list where the list field name is for example 'SecName'and the SecName value is equal to for example 'xxx', I know how to create it in sql, but I want to create and use it with entity framework. Like Executing String in sql.