Observable

Observable.LongCount<TSource> Method

Returns a Int64 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 LongCount(Of TSource) ( _
    source As IObservable(Of TSource) _
) As IObservable(Of Long)
'Usage
Dim source As IObservable(Of TSource)
Dim returnValue As IObservable(Of Long)

returnValue = source.LongCount()
public static IObservable<long> LongCount<TSource>(
    this IObservable<TSource> source
)
[ExtensionAttribute]
public:
generic<typename TSource>
static IObservable<long long>^ LongCount(
    IObservable<TSource>^ source
)
static member LongCount : 
        source:IObservable<'TSource> -> IObservable<int64> 
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<Int64>
A Int64 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