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Reactive Extensions
Reactive Extensions Class Library
System.Reactive.Linq
Observable Class
Observable Methods
Aggregate Method
All(TSource) Method
Amb Method
And(TLeft, TRight) Method
Any Method
AsObservable(TSource) Method
Average Method
Buffer Method
Cast(TResult) Method
Catch Method
CombineLatest(TFirst, TSecond, TResult) Method
Concat Method
Contains Method
Count(TSource) Method
Create Method
DefaultIfEmpty Method
Defer(TValue) Method
Delay Method
Dematerialize(TSource) Method
Distinct Method
DistinctUntilChanged Method
Do Method
ElementAt(TSource) Method
ElementAtOrDefault(TSource) Method
Empty Method
Finally(TSource) Method
First Method
FirstOrDefault Method
ForEach(TSource) Method
FromAsyncPattern Method
FromEvent Method
FromEventPattern Method
Generate Method
GetEnumerator(TSource) Method
GroupBy Method
GroupByUntil Method
GroupJoin(TLeft, TRight, TLeftDuration, TRightDuration, TResult) Method
IgnoreElements(TSource) Method
Interval Method
Join(TLeft, TRight, TLeftDuration, TRightDuration, TResult) Method
Last Method
LastOrDefault Method
Latest(TSource) Method
LongCount(TSource) Method
Materialize(TSource) Method
Max Method
MaxBy Method
Merge Method
Min Method
MinBy Method
MostRecent(TSource) Method
Multicast Method
Never(TResult) Method
Next(TSource) Method
ObserveOn Method
OfType(TResult) Method
OnErrorResumeNext Method
Publish Method
PublishLast Method
Range Method
RefCount(TSource) Method
Repeat Method
Replay Method
Retry Method
Return Method
Sample Method
Scan Method
Select Method
SelectMany Method
SequenceEqual Method
Single Method
SingleOrDefault Method
Skip(TSource) Method
SkipLast(TSource) Method
SkipUntil(TSource, TOther) Method
SkipWhile Method
Start Method
StartWith Method
Subscribe Method
SubscribeOn Method
Sum Method
Switch(TSource) Method
Synchronize Method
Take(TSource) Method
TakeLast(TSource) Method
TakeUntil(TSource, TOther) Method
TakeWhile Method
Then(TSource, TResult) Method
Throttle Method
Throw Method
TimeInterval Method
Timeout Method
Timer Method
Timestamp Method
ToArray(TSource) Method
ToAsync Method
ToDictionary Method
ToEnumerable(TSource) Method
ToEvent Method
ToEventPattern(TEventArgs) Method
ToList(TSource) Method
ToLookup Method
ToObservable Method
Using(TSource, TResource) Method
When Method
Where Method
Window Method
Zip Method
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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)
C#
C++
F#
JScript
VB
Copy 
public static IObservable<int> Count<TSource>(
	this IObservable<TSource> source
)

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 http://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or http://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.
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