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 )
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.
The type of elements of source.
The type of the elements of the sequence returned by selector.
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.
Available since 8
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 8.1