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ParallelEnumerable.Average(Of TSource) Method (ParallelQuery(Of TSource), Func(Of TSource, Nullable(Of Decimal)))

Computes in parallel the average of a sequence of values that are obtained by invoking a transform function on each element of the input sequence.

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

'Declaration
<ExtensionAttribute> _
Public Shared Function Average(Of TSource) ( _
	source As ParallelQuery(Of TSource), _
	selector As Func(Of TSource, Nullable(Of Decimal)) _
) As Nullable(Of Decimal)

Type Parameters

TSource

The type of elements of source.

Parameters

source
Type: System.Linq.ParallelQuery(Of TSource)

A sequence of values that are used to calculate an average.

selector
Type: System.Func(Of TSource, Nullable(Of Decimal))

A transform function to apply to each element.

Return Value

Type: System.Nullable(Of Decimal)
The average of the sequence of values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery(Of 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
OperationCanceledException

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

ArgumentNullException

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

AggregateException

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

InvalidOperationException

source contains no elements.

OverflowException

(Thrown as inner exception in an AggregateException). The selector function returns a value greater than MaxValue for the element type.

.NET Framework

Supported in: 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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