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ParallelEnumerable.Max(Of TSource) Method (ParallelQuery(Of TSource), Func(Of TSource, Nullable(Of Double)))

Invokes in parallel a transform function on each element of a sequence and returns the maximum value.

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

<ExtensionAttribute> _
Public Shared Function Max(Of TSource) ( _
	source As ParallelQuery(Of TSource), _
	selector As Func(Of TSource, Nullable(Of Double)) _
) As Nullable(Of Double)

Type Parameters


The type of elements of source.


Type: System.Linq.ParallelQuery(Of TSource)

A sequence of values to determine the maximum value of.

Type: System.Func(Of TSource, Nullable(Of Double))

A transform function to apply to each element.

Return Value

Type: System.Nullable(Of Double)
The maximum value in the sequence.

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).


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


source or selector 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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