GroupBy<TSource,TKey,TElement>(IIndexedSource<TSource>,Expression<Func<TSource,TKey>>,Expression<Func<TSource,TElement>>) Method

In This Topic

Groups the elements of a collection according to a specified key selector function and projects the elements for each group by using a specified function.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Shared Function GroupBy
    (Of TSource,TKey,TElement)( _
   ByVal source As IIndexedSource(Of TSource), _
   ByVal keySelector As System.Linq.Expressions.Expression(Of Func(Of TSource,TKey)), _
   ByVal elementSelector As System.Linq.Expressions.Expression(Of Func(Of TSource,TElement)) _
) As IIndexedSource(Of IGrouping(Of TKey,TElement))

public static IIndexedSource<IGrouping<TKey,TElement>> GroupBy<TSource,TKey,TElement>( 
   IIndexedSource<TSource> source,
   System.Linq.Expressions.Expression<Func<TSource,TKey>> keySelector,
   System.Linq.Expressions.Expression<Func<TSource,TElement>> elementSelector
)

Parameters

source: An C1.LiveLinq.Indexing.IIndexedSource<T> whose elements to group
keySelector: A function to extract the key for each element.
elementSelector: A function to map each source element to an element in the System.Linq.IGrouping`2.

Type Parameters

TSource: The type of the elements of source.
TKey: The type of the key returned by keySelector.
TElement: The type of the elements in the System.Linq.IGrouping`2.

Return Value

A collection of System.Linq.IGrouping`2 objects each containing a collection of objects of type TElement and a key.

Reference

IndexedQueryExtensions Class
IndexedQueryExtensions Members
Overload List