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ParallelEnumerable.Average Method (ParallelQuery<Nullable<Double>>)

Computes in parallel the average of a sequence of values.

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

public static Nullable<double> Average(
	this ParallelQuery<Nullable<double>> source


Type: System.Linq.ParallelQuery<Nullable<Double>>

The source sequence.

Return Value

Type: System.Nullable<Double>
Returns 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<Nullable<Double>>. 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).


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


A sequence of values that are used to calculate an average.The average of the sequence of values.source is a null reference (Nothing in Visual Basic).


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


source contains no elements.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1
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