SelectMany<TSource,TCollection,TResult>(IIndexedSource<TSource>,Expression<Func<TSource,IEnumerable<TCollection>>>,Expression<Func<TSource,TCollection,TResult>>) Method

In This Topic

Projects each element of a collection to a sequence of collections, flattens the resulting collections into one collection, and invokes a result selector function on each element therein.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Shared Function SelectMany
    (Of TSource,TCollection,TResult)( _
   ByVal source As IIndexedSource(Of TSource), _
   ByVal collectionSelector As Expression(Of Func(Of TSource,IEnumerable(Of TCollection))), _
   ByVal resultSelector As Expression(Of Func(Of TSource,TCollection,TResult)) _
) As IIndexedSource(Of TResult)

public static IIndexedSource<TResult> SelectMany<TSource,TCollection,TResult>( 
   IIndexedSource<TSource> source,
   Expression<Func<TSource,IEnumerable<TCollection>>> collectionSelector,
   Expression<Func<TSource,TCollection,TResult>> resultSelector
)

Parameters

source: A collection of values to project.
collectionSelector: A transform function to apply to each element of the input collection.
resultSelector: A transform function to apply to each element of the intermediate sequence.

Type Parameters

TSource: The type of the elements of source.
TCollection: The type of the intermediate elements collected by collectionSelector.
TResult: The type of the elements of the resulting collection.

Return Value

An IIndexedSource<TResult> whose elements are the result of invoking the one-to-many transform function collectionSelector on each element of source and then mapping each of those sequence elements and their corresponding source element to a result element.

Reference

IndexedQueryExtensions Class
IndexedQueryExtensions Members
Overload List