ParallelEnumerable.SelectMany<TSource, TResult> Method (ParallelQuery<TSource>, Func<TSource, Int32, IEnumerable<TResult>>)
Projects in parallel each element of a sequence to an IEnumerable<T>, and flattens the resulting sequences into one sequence. The index of each source element is used in the projected form of that element.
Assembly: System.Core (in System.Core.dll)
public static ParallelQuery<TResult> SelectMany<TSource, TResult>( this ParallelQuery<TSource> source, Func<TSource, int, IEnumerable<TResult>> selector )
The type of elements of source.
The type of the elements of the sequence returned by selector.
- Type: System.Linq.ParallelQuery<>
A sequence of values to project.
Return ValueType: System.Linq.ParallelQuery<>
A sequence whose elements are the result of invoking the one-to-many transform function on each element of the input sequence.
Usage NoteIn Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery<>. 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).
source or selector is a null reference (Nothing in Visual Basic).
The query was canceled with the token passed in through WithCancellation.
More than MaxValue elements are enumerated by the query.
One or more exceptions occurred during the evaluation of the query.
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