ObservableExtensions.Subscribe<TSource> Method (IObservable<TSource>, Action<TSource>, Action)

Subscribes an element handler and a completion handler to an observable sequence.

Namespace:  System
Assembly:  System.Reactive (in System.Reactive.dll)


<ExtensionAttribute> _
Public Shared Function Subscribe(Of TSource) ( _
    source As IObservable(Of TSource), _
    onNext As Action(Of TSource), _
    onCompleted As Action _
) As IDisposable
Dim source As IObservable(Of TSource)
Dim onNext As Action(Of TSource)
Dim onCompleted As Action
Dim returnValue As IDisposable

returnValue = source.Subscribe(onNext, _
public static IDisposable Subscribe<TSource>(
    this IObservable<TSource> source,
    Action<TSource> onNext,
    Action onCompleted
generic<typename TSource>
static IDisposable^ Subscribe(
    IObservable<TSource>^ source, 
    Action<TSource>^ onNext, 
    Action^ onCompleted
static member Subscribe : 
        source:IObservable<'TSource> * 
        onNext:Action<'TSource> * 
        onCompleted:Action -> IDisposable 
JScript does not support generic types and methods.

Type Parameters

  • TSource


  • onNext
    Type: System.Action<TSource>
    Action to invoke for each element in the observable sequence.
  • onCompleted
    Type: System.Action
    Action to invoke upon graceful termination of the observable sequence.

Return Value

Type: System.IDisposable
IDisposable object used to unsubscribe from the observable 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 or .

See Also


ObservableExtensions Class

Subscribe Overload

System Namespace