Qbservable::Publish<TSource, TResult> Method (IQbservable<TSource>, Expression<Func<IObservable<TSource>, IObservable<TResult>>>, TSource)

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

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

generic<typename TSource, typename TResult>
static IQbservable<TResult>^ Publish(
	IQbservable<TSource>^ source, 
	Expression<Func<IObservable<TSource>^, IObservable<TResult>^>^>^ selector, 
	TSource initialValue

Type Parameters


The type of source.


The type of result.


Type: System.Reactive.Linq::IQbservable<TSource>
The source sequence whose elements will be multicasted through a single shared subscription.
Type: System.Linq.Expressions::Expression<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.
Type: TSource
The initial value received by observers upon subscription.

Return Value

Type: System.Reactive.Linq::IQbservable<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<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.