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Observable.Any(Of TSource) Method (IObservable(Of TSource))

Determines whether an observable sequence contains any elements.

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

'Declaration
<ExtensionAttribute> _
Public Shared Function Any(Of TSource) ( _
	source As IObservable(Of TSource) _
) As IObservable(Of Boolean)
'Usage
Dim source As IObservable(Of TSource)
Dim returnValue As IObservable(Of Boolean)

returnValue = source.Any()

Type Parameters

TSource

The type of source.

Parameters

source
Type: System.IObservable(Of TSource)
An observable sequence to check for non-emptiness.

Return Value

Type: System.IObservable(Of Boolean)
True if an observable sequence contains any elements; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable(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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