Projects each element of a sequence to an IEnumerable{T},
flattens the resulting sequences into one sequence, and invokes a result selector
function on each element therein.
Namespace:
System.Linq
Assembly:
System.Threading (in System.Threading.dll)
Syntax
| Visual Basic (Declaration) |
|---|
Public Shared Function SelectMany(Of TSource, TCollection, TResult) ( _
source As ParallelQuery(Of TSource), _
collectionSelector As Func(Of TSource, IEnumerable(Of TCollection)), _
resultSelector As Func(Of TSource, TCollection, TResult) _
) As ParallelQuery(Of TResult) |
| C# |
|---|
public static ParallelQuery<TResult> SelectMany<TSource, TCollection, TResult>(
ParallelQuery<TSource> source,
Func<TSource, IEnumerable<TCollection>> collectionSelector,
Func<TSource, TCollection, TResult> resultSelector
)
|
Parameters
- source
- Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
A sequence of values to project.
- collectionSelector
- Type: System..::.Func<(Of <(TSource, IEnumerable<(Of <(TCollection>)>)>)>)
A transform function to apply to each source element;
the second parameter of the function represents the index of the source element.
- resultSelector
- Type: System..::.Func<(Of <(TSource, TCollection, TResult>)>)
A function to create a result element from an element from
the first sequence and a collection of matching elements from the second sequence.
Type Parameters
- TSource
- The type of elements of source.
- TCollection
- The type of the intermediate elements collected by collectionSelector.
- TResult
Return Value
A sequence whose elements are the result of invoking the one-to-many transform
function
collectionSelector on each element of
source and then mapping
each of those sequence elements and their corresponding source element to a result element.
Exceptions
| Exception | Condition |
|---|
| System..::.ArgumentNullException |
source or collectionSelector or
resultSelector is a null reference (Nothing in Visual Basic).
|
See Also
