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Observable.SelectMany(Of TSource, TResult) Method (IObservable(Of TSource), Func(Of TSource, IEnumerable(Of 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)

'Declaration
<ExtensionAttribute> _
Public Shared Function SelectMany(Of TSource, TResult) ( _
	source As IObservable(Of TSource), _
	selector As Func(Of TSource, IEnumerable(Of TResult)) _
) As IObservable(Of TResult)
'Usage
Dim source As IObservable(Of TSource)
Dim selector As Func(Of TSource, IEnumerable(Of TResult))
Dim returnValue As IObservable(Of TResult)

returnValue = source.SelectMany(selector)

Type Parameters

TSource

The type of source.

TResult

The type of result.

Parameters

source
Type: System.IObservable(Of TSource)
An observable sequence of elements to project.
selector
Type: System.Func(Of TSource, IEnumerable(Of TResult))
A transform function to apply to each element.

Return Value

Type: System.IObservable(Of TResult)
An observable sequence whose elements are the result of invoking the one-to-many transform function on each element of the input sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable(Of TSource). When you use instance method syntax to call this method, omit the first parameter. For more information, see http://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or http://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.
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