Groups the elements of a sequence. Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The elements of each group are projected by using a specified function.

The following example uses the GroupBy method to return objects that are grouped by PersonID. var results = persons.GroupBy(x => x.PersonID) .Select(x => (PersonID: x.Key, Cars: x.Select(p => p.car).ToList()) ).ToList();

What is LINQ GroupBy Method in C#? The LINQ GroupBy method is a powerful feature in .NET that allows us to organize elements of a collection into groups based on a specified key value. The GroupBy Method groups elements that share a common attribute, allowing us to perform operations on each group.

May 31, 2024 · Grouping is one of the most powerful capabilities of LINQ. The following examples show how to group data in various ways: By a single property. By the first letter of a string property. By a computed numeric range. By Boolean predicate or …

In this tutorial, you'll learn how to use the LINQ GroupBy() method to group the elements of a sequence based on a key.

Apr 7, 2022 · GroupBy is a LINQ functionality which allows to group items from a collection based on a given key. It’s an equivalent to SQL’s GROUP BY clause. In this article we’ll show various examples of usage, starting from the simplest grouping by one key, through grouping by multiple keys, custom result selector and all of that in two variants ...

Group by works by taking whatever you are grouping and putting it into a collection of items that match the key you specify in your group by clause. If you have the following data: And the following query. group m by m.GroupCode into membersByGroupCode. select membersByGroupCode; The group by will return the following results:

Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Keys are compared by using a specified comparer and the elements of each group are projected by using a specified function.

Mar 8, 2011 · var newList = list .GroupBy(x => new {x.School, x.Friend, x.FavoriteColor}) .Select(y => new ConsolidatedChild() { FavoriteColor = y.Key.FavoriteColor, Friend = y.Key.Friend, School = y.Key.School, Children = y.ToList() } );

In LINQ (Language-Integrated Query), you can use the GroupBy method to group elements in a collection based on one or more keys. This approach is useful when organizing data based on a combination of properties. The GroupBy Method in LINQ (Language Integrated Query) allows us to group sequence elements based on a specified key.