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 .