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

JScript does not support generic types and methods.

Type Parameters


The type of source.


The type of result.


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

Return Value

Type: System.IObservable(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(TSource). When you use instance method syntax to call this method, omit the first parameter. For more information, see https://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.