Qbservable.Do<TSource> Method (IQbservable<TSource>, Expression<Action<TSource>>, Expression<Action<Exception>>)

Invokes an action for each element in the queryable observable sequence and invokes an action upon exceptional termination of the queryable observable sequence.

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


<ExtensionAttribute> _
Public Shared Function Do(Of TSource) ( _
    source As IQbservable(Of TSource), _
    onNext As Expression(Of Action(Of TSource)), _
    onError As Expression(Of Action(Of Exception)) _
) As IQbservable(Of TSource)
Dim source As IQbservable(Of TSource)
Dim onNext As Expression(Of Action(Of TSource))
Dim onError As Expression(Of Action(Of Exception))
Dim returnValue As IQbservable(Of TSource)

returnValue = source.Do(onNext, onError)
public static IQbservable<TSource> Do<TSource>(
    this IQbservable<TSource> source,
    Expression<Action<TSource>> onNext,
    Expression<Action<Exception>> onError
generic<typename TSource>
static IQbservable<TSource>^ Do(
    IQbservable<TSource>^ source, 
    Expression<Action<TSource>^>^ onNext, 
    Expression<Action<Exception^>^>^ onError
static member Do : 
        source:IQbservable<'TSource> * 
        onNext:Expression<Action<'TSource>> * 
        onError:Expression<Action<Exception>> -> IQbservable<'TSource> 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.


Return Value

Type: System.Reactive.Linq.IQbservable<TSource>
The source sequence with the side-effecting behavior applied.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .

See Also


Qbservable Class

Do Overload

System.Reactive.Linq Namespace