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PublishSubscribeSession.BeginSubscribe Method

Begins an asynchronous operation to subscribe to the presence session.

Namespace:  Microsoft.Rtc.Collaboration.Presence
Assembly:  Microsoft.Rtc.Collaboration (in Microsoft.Rtc.Collaboration.dll)

public virtual IAsyncResult BeginSubscribe(
	AsyncCallback userCallback,
	Object state
)

Parameters

userCallback
Type: System.AsyncCallback
The method to be called when the asynchronous operation is completed.
state
Type: System.Object
A user-provided object that distinguishes this particular asynchronous operation from other asynchronous operations.

Return Value

Type: System.IAsyncResult
An IAsyncResult that references the asynchronous operation.

ExceptionCondition
InvalidOperationException

Thrown when the subscription is not in a valid state.

UCMA allows subscription to be reused. Hence, the application can re-subscribe to the same subscription after it has been unsubscribed.

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