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

Projects in parallel each element of a sequence into a new form by incorporating the element's index.

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

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

Type Parameters

TSource

The type of the elements of source.

TResult

The type of elements resturned by selector.

Parameters

source
Type: System.Linq.ParallelQuery<TSource>

A sequence of values to invoke a transform function on.

selector
Type: System.Func<TSource, Int32, 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 transform function on each element of source, based on the index supplied to selector.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

ExceptionCondition
ArgumentNullException

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

OperationCanceledException

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

AggregateException

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

OverflowException

More than MaxValue elements are enumerated by the query. This condition might occur in streaming scenarios.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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