private void ShutdownContactSubscription(AsyncTask task, object state)
{
if (m_contactGroupServices.CurrentState != CollaborationSubscriptionState.Subscribed)
{
task.Complete(null);
return;
}
m_contactGroupServices.NotificationReceived -= this.ContactGroupServices_NotificationReceived;
task.DoOneStep(
delegate()
{
Logger.Log(Logger.LogLevel.Info, "Starting contact unsubscription.");
m_contactGroupServices.BeginUnsubscribe(
delegate(IAsyncResult ar)
{
task.DoFinalStep(
delegate()
{
m_contactGroupServices.EndUnsubscribe(ar);
Logger.Log(Logger.LogLevel.Info, "Started contact unsubscription.");
});
},
null);
});
}
// Callback method referred to in the call to BeginUnsubscribe on the ContactGroupServices instance.
private void ContactGroupUnsubscribeCB(IAsyncResult ar)
{
ContactGroupServices services = ar.AsyncState as ContactGroupServices;
try
{
services.EndUnsubscribe(ar);
}
// A production application should have catch blocks for a number
// of other exceptions, including InvalidOperationException and PublishSubscribeException.
catch (RealTimeException exception)
{
Console.WriteLine("Contact Group Unsubscription failed due to exception: {0}",
exception.ToString());
}
}