ParallelEnumerable.ThenBy<TSource, TKey> Method (OrderedParallelQuery<TSource>, Func<TSource, TKey>, IComparer<TKey>)

Performs in parallel a subsequent ordering of the elements in a sequence in ascending order by using a specified comparer.

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

public static OrderedParallelQuery<TSource> ThenBy<TSource, TKey>(
	this OrderedParallelQuery<TSource> source,
	Func<TSource, TKey> keySelector,
	IComparer<TKey> comparer
)

Type Parameters

TSource

The type of elements of source.

TKey

The type of the key returned by keySelector.

Parameters

source
Type: System.Linq.OrderedParallelQuery<TSource>
An OrderedParallelQuery{TSource} that contains elements to sort.
keySelector
Type: System.Func<TSource, TKey>
A function to extract a key from an element.
comparer
Type: System.Collections.Generic.IComparer<TKey>
An IComparer{TKey} to compare keys.

Return Value

Type: System.Linq.OrderedParallelQuery<TSource>
An OrderedParallelQuery{TSource} whose elements are sorted according to a key.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type OrderedParallelQuery<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 keySelector 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.

In contrast to the sequential implementation, this is not a stable sort. See the remarks for OrderBy for an approach to implementing a stable sort.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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