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)
Syntax
'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()
public static IObservable<bool> Any<TSource>(
this IObservable<TSource> source
)
[ExtensionAttribute]
public:
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.
Parameters
- 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 .