SipSubscription.BeginSubscribe(AsyncCallback, Object) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Creates an subscribe request body and puts the workItem in queue to invoke Subscribe.
public:
IAsyncResult ^ BeginSubscribe(AsyncCallback ^ userCallback, System::Object ^ state);public IAsyncResult BeginSubscribe (AsyncCallback userCallback, object state);member this.BeginSubscribe : AsyncCallback * obj -> IAsyncResultPublic Function BeginSubscribe (userCallback As AsyncCallback, state As Object) As IAsyncResultParameters
- userCallback
- AsyncCallback
The method to be called when the asynchronous operation is completed.
- state
- Object
A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.
Returns
An IAsyncResult that references the asynchronous operation.
Exceptions
Thrown if event package is "vnd-microsoft-roaming-self" and RealTimeEndpoint already have a subscription for this event.
Remarks
Multiple subscription for the event "vnd-microsoft-roaming-self" are not allowed from same endpoint, so establishing another subscription session for this event will cause InvalidOperationException.