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

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

Namespace:  System.Reactive.Linq
Assembly:  System.Reactive.Providers (in System.Reactive.Providers.dll)
'Declaration
<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)), _
	onCompleted As Expression(Of Action) _
) As IQbservable(Of TSource)
'Usage
Dim source As IQbservable(Of TSource)
Dim onNext As Expression(Of Action(Of TSource))
Dim onError As Expression(Of Action(Of Exception))
Dim onCompleted As Expression(Of Action)
Dim returnValue As IQbservable(Of TSource)

returnValue = source.Do(onNext, onError, _
	onCompleted)

Type Parameters

TSource

The type of source.

Parameters

source
Type: System.Reactive.Linq.IQbservable(Of TSource)
The source sequence.
onNext
Type: System.Linq.Expressions.Expression(Of Action(Of TSource))
The action to invoke for each element in the queryable observable sequence.
onError
Type: System.Linq.Expressions.Expression(Of Action(Of Exception))
The action to invoke upon exceptional termination of the queryable observable sequence.
onCompleted
Type: System.Linq.Expressions.Expression(Of Action)
The action to invoke upon graceful termination of the queryable observable sequence.

Return Value

Type: System.Reactive.Linq.IQbservable(Of 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(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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