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Observable.Any<TSource> Method (IObservable<TSource>)

Determines whether an observable sequence contains any elements.

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


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

returnValue = source.Any()
public static IObservable<bool> Any<TSource>(
    this IObservable<TSource> source
generic<typename TSource>
static IObservable<bool>^ Any(
    IObservable<TSource>^ source
static member Any : 
        source:IObservable<'TSource> -> IObservable<bool> 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.


  • source
    Type: System.IObservable<TSource>
    An observable sequence to check for non-emptiness.

Return Value

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

See Also


Observable Class

Any Overload

System.Reactive.Linq Namespace