Observable.SelectMany<TSource, TCollection, TResult> Method (IObservable<TSource>, Func<TSource, IObservable<TCollection>>, Func<TSource, TCollection, TResult>)
Projects each element of an observable sequence to an observable sequence and flattens the resulting observable sequences into one observable sequence.
Namespace: System.Reactive.Linq
Assembly: System.Reactive (in System.Reactive.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function SelectMany(Of TSource, TCollection, TResult) ( _
source As IObservable(Of TSource), _
collectionSelector As Func(Of TSource, IObservable(Of TCollection)), _
resultSelector As Func(Of TSource, TCollection, TResult) _
) As IObservable(Of TResult)
'Usage
Dim source As IObservable(Of TSource)
Dim collectionSelector As Func(Of TSource, IObservable(Of TCollection))
Dim resultSelector As Func(Of TSource, TCollection, TResult)
Dim returnValue As IObservable(Of TResult)
returnValue = source.SelectMany(collectionSelector, _
resultSelector)
public static IObservable<TResult> SelectMany<TSource, TCollection, TResult>(
this IObservable<TSource> source,
Func<TSource, IObservable<TCollection>> collectionSelector,
Func<TSource, TCollection, TResult> resultSelector
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TCollection, typename TResult>
static IObservable<TResult>^ SelectMany(
IObservable<TSource>^ source,
Func<TSource, IObservable<TCollection>^>^ collectionSelector,
Func<TSource, TCollection, TResult>^ resultSelector
)
static member SelectMany :
source:IObservable<'TSource> *
collectionSelector:Func<'TSource, IObservable<'TCollection>> *
resultSelector:Func<'TSource, 'TCollection, 'TResult> -> IObservable<'TResult>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type of source.
- TCollection
The type of collection.
- TResult
The type of result.
Parameters
- source
Type: System.IObservable<TSource>
An observable sequence of elements to project.
- collectionSelector
Type: System.Func<TSource, IObservable<TCollection>>
A transform function to apply to each element.
- resultSelector
Type: System.Func<TSource, TCollection, TResult>
A transform function to apply to each element of the intermediate sequence.
Return Value
Type: System.IObservable<TResult>
An observable sequence whose elements are the result of invoking the one-to-many transform function collectionSelector on each element of the input sequence and then mapping each of those sequence elements and their corresponding source element to a result element.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .