Observable.Count<TSource> Method
Returns a Int32 that represents the total number of elements in an observable sequence.
Namespace: System.Reactive.Linq
Assembly: System.Reactive (in System.Reactive.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function Count(Of TSource) ( _
source As IObservable(Of TSource) _
) As IObservable(Of Integer)
'Usage
Dim source As IObservable(Of TSource)
Dim returnValue As IObservable(Of Integer)
returnValue = source.Count()
public static IObservable<int> Count<TSource>(
this IObservable<TSource> source
)
[ExtensionAttribute]
public:
generic<typename TSource>
static IObservable<int>^ Count(
IObservable<TSource>^ source
)
static member Count :
source:IObservable<'TSource> -> IObservable<int>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type of source.
Parameters
- source
Type: System.IObservable<TSource>
An observable sequence that contains elements to be counted.
Return Value
Type: System.IObservable<Int32>
A Int32 that represents the total number of elements in an observable sequence.
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 .