Qbservable.PublishLast(Of TSource, TResult) Method

Returns a queryable observable sequence that is the result of invoking the selector on a connectable queryable observable sequence that shares a single subscription to the underlying sequence containing only the last notification.

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

<ExtensionAttribute> _
Public Shared Function PublishLast(Of TSource, TResult) ( _
	source As IQbservable(Of TSource), _
	selector As Expression(Of Func(Of IObservable(Of TSource), IObservable(Of TResult))) _
) As IQbservable(Of TResult)
Dim source As IQbservable(Of TSource)
Dim selector As Expression(Of Func(Of IObservable(Of TSource), IObservable(Of TResult)))
Dim returnValue As IQbservable(Of TResult)

returnValue = source.PublishLast(selector)

Type Parameters


The type of source.


The type of result.


Type: System.Reactive.Linq.IQbservable(Of TSource)
The source sequence whose elements will be multicasted through a single shared subscription.
Type: System.Linq.Expressions.Expression(Of Func(Of IObservable(Of TSource), IObservable(Of TResult)))
The selector function which can use the multicasted source sequence as many times as needed, without causing multiple subscriptions to the source sequence.

Return Value

Type: System.Reactive.Linq.IQbservable(Of TResult)
A queryable observable sequence that contains the elements of a sequence produced by multicasting the source sequence within a selector function.

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 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.