BeginSubscribe Method

Creates a subscribe request body and puts the workItem in queue to invoke Subscribe.

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

Syntax

'Declaration
Public Function BeginSubscribe ( _
    userCallback As AsyncCallback, _
    state As Object _
) As IAsyncResult
'Usage
Dim instance As SipSubscription
Dim userCallback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult

returnValue = instance.BeginSubscribe(userCallback, _
    state)
public IAsyncResult BeginSubscribe(
    AsyncCallback userCallback,
    Object state
)

Parameters

Return Value

Type: System..::..IAsyncResult
An [IAsyncResult] state object representing the operation.

Exceptions

Exception Condition
InvalidOperationException

Thrown when the Subscribe/BeginSubscribe operation to this SipSubscription had already been called.

-or-

Thrown when the endpoint is terminating.

-or-

Thrown if the event package is "vnd-microsoft-roaming-self" and sipendpoint already have a subscription for this event.

Remarks

Because multiple subscriptions for the event "vnd-microsoft-roaming-self" are not allowed from same endpoint, establishing another subscription session for this event causes [InvalidOperationException].

See Also

Reference

SipSubscription Class

SipSubscription Members

Microsoft.Rtc.Signaling Namespace