Observable

Observable.PublishLast<TSource, TResult> Method (IObservable<TSource>, Func<IObservable<TSource>, IObservable<TResult>>)

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

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

Syntax

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

returnValue = source.PublishLast(selector)
public static IObservable<TResult> PublishLast<TSource, TResult>(
    this IObservable<TSource> source,
    Func<IObservable<TSource>, IObservable<TResult>> selector
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TResult>
static IObservable<TResult>^ PublishLast(
    IObservable<TSource>^ source, 
    Func<IObservable<TSource>^, IObservable<TResult>^>^ selector
)
static member PublishLast : 
        source:IObservable<'TSource> * 
        selector:Func<IObservable<'TSource>, IObservable<'TResult>> -> IObservable<'TResult> 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.

  • TResult
    The type of result.

Parameters

  • source
    Type: System.IObservable<TSource>
    The source sequence whose elements will be multicasted through a single shared subscription.

  • selector
    Type: System.Func<IObservable<TSource>, IObservable<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.IObservable<TResult>
An 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 IObservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .

See Also

Reference

Observable Class

PublishLast Overload

System.Reactive.Linq Namespace