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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 .

See Also

Reference

Observable Class

System.Reactive.Linq Namespace