SelectMany(TSource, TResult) Method (ParallelQuery(TSource), Func(TSource, Int32, IEnumerable(TResult)))

ParallelEnumerable.SelectMany<TSource, TResult> Method (ParallelQuery<TSource>, Func<TSource, Int32, IEnumerable<TResult>>)

 

Projects in parallel each element of a sequence to an IEnumerable<T>, and flattens the resulting sequences into one sequence. The index of each source element is used in the projected form of that element.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

public static ParallelQuery<TResult> SelectMany<TSource, TResult>(
	this ParallelQuery<TSource> source,
	Func<TSource, int, IEnumerable<TResult>> selector
)

Parameters

source
Type: System.Linq.ParallelQuery<TSource>

A sequence of values to project.

selector
Type: System.Func<TSource, Int32, IEnumerable<TResult>>

A transform function to apply to each element.

Return Value

Type: System.Linq.ParallelQuery<TResult>

A sequence whose elements are the result of invoking the one-to-many transform function on each element of the input sequence.

Type Parameters

TSource

The type of elements of source.

TResult

The type of the elements of the sequence returned by selector.

Exception Condition
ArgumentNullException

source or selector is a null reference (Nothing in Visual Basic).

OperationCanceledException

The query was canceled with the token passed in through WithCancellation.

OverflowException

More than MaxValueelements are enumerated by the query.

AggregateException

One or more exceptions occurred during the evaluation of the query.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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