OrderBy(TSource, TKey) Method (ParallelQuery(TSource), Func(TSource, TKey))

Sorts in parallel the elements of a sequence in ascending order according to a key.

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

Syntax

Visual Basic (Declaration)
Public Shared Function OrderBy(Of TSource, TKey) ( _ source As ParallelQuery(Of TSource), _ keySelector As Func(Of TSource, TKey) _ ) As OrderedParallelQuery(Of TSource)

C#
public static OrderedParallelQuery<TSource> OrderBy<TSource, TKey>( ParallelQuery<TSource> source, Func<TSource, TKey> keySelector )

source: Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
A sequence of values to order.

keySelector: Type: System..::.Func<(Of <(TSource, TKey>)>)
A function to extract a key from an element.

An OrderedParallelQuery{TSource} whose elements are sorted according to a key.

In contrast to the sequential implementation, this is not a stable sort. To achieve a stable sort, change a query of the form:

	Copy Code
var ordered = source.OrderBy((e) => e.k);

to instead be formed as:

	Copy Code
var ordered = source.Select((e,i) => new { E=e, I=i }).OrderBy((v) => v.i).Select((v) => v.e);

Exception	Condition
System..::.ArgumentNullException	source or keySelector is a null reference (Nothing in Visual Basic).