Vista - Tearing Down a Callback 'Event' if the client has aborted

Hi

I'm playing with the WCF and have created an eventing mechanism whereby the
server makes 'callback' events to the client. The client subscribes and
unsubscribes nicely with the server, so that a simple Timer event from the
service can notify client accordingly.

My question lies with the 'loss' of the client (say a crash) before
unsubscribing. When the server makes the callback to the now non-existent
client, a CommunicationObjectAbortedException is thrown. Does anyone know how
I remove the delegate to my non-existent client callback?

Thanks

Enclosed is a code extract from my 'Timer Service:


void tickTimer_Elapsed(object unused)
{
lock (this)
{
if (tick != null)
{
try
{
tick(null, EventArgs.Empty);
}
catch (CommunicationObjectAbortedException e)
{
// Remove eventhandler here as I have to assume the
Client has aborted!
// ************* ????????? ***************
}
}
}
}

/// <summary>
///
/// </summary>
public void Subscribe()
{
ITick subscriber =
OperationContext.Current.GetCallbackChannel<ITick>();
tick += subscriber.OnTick;
}

/// <summary>
///
/// </summary>
public void Unsubscribe()
{
lock (this)
{
ITick subscriber =
OperationContext.Current.GetCallbackChannel<ITick>();
tick -= subscriber.OnTick;
}
}

Even worse case when callback IsOneWay ( common use for callbacks) , I don't
receive notification up to the next retry.
The only way I can propose : to check Tcp table for client's port.
Arkady

"Jon" <Jon@discussions.microsoft.com> wrote in message
news:722F1587-BBF5-40D6-9268-9FE130648817@microsoft.com...
> Hi
>
> I'm playing with the WCF and have created an eventing mechanism whereby
> the
> server makes 'callback' events to the client. The client subscribes and
> unsubscribes nicely with the server, so that a simple Timer event from the
> service can notify client accordingly.
>
> My question lies with the 'loss' of the client (say a crash) before
> unsubscribing. When the server makes the callback to the now non-existent
> client, a CommunicationObjectAbortedException is thrown. Does anyone know
> how
> I remove the delegate to my non-existent client callback?
>
> Thanks
>
> Enclosed is a code extract from my 'Timer Service:
>
>
> void tickTimer_Elapsed(object unused)
> {
> lock (this)
> {
> if (tick != null)
> {
> try
> {
> tick(null, EventArgs.Empty);
> }
> catch (CommunicationObjectAbortedException e)
> {
> // Remove eventhandler here as I have to assume the
> Client has aborted!
> // ************* ????????? ***************
> }
> }
> }
> }
>
> /// <summary>
> ///
> /// </summary>
> public void Subscribe()
> {
> ITick subscriber =
> OperationContext.Current.GetCallbackChannel<ITick>();
> tick += subscriber.OnTick;
> }
>
> /// <summary>
> ///
> /// </summary>
> public void Unsubscribe()
> {
> lock (this)
> {
> ITick subscriber =
> OperationContext.Current.GetCallbackChannel<ITick>();
> tick -= subscriber.OnTick;
> }
> }
>