""Jeffrey Tan[MSFT]"" wrote:

> Hi,
>
> Sorry for letting you wait.
>
> I finally found out the root cause. The OnStop method of ServiceBase is
> triggerred by ServiceBase.DeferredStop method. Using Reflector, we can see
> the source code like this:
>
> private unsafe void DeferredStop()
> {
> fixed (NativeMethods.SERVICE_STATUS* service_statusRef1 =
> &this.status)
> {
> int num1 = this.status.currentState;
> this.status.checkPoint = 0;
> this.status.waitHint = 0;
> this.status.currentState = 3;
> NativeMethods.SetServiceStatus(this.statusHandle,
> service_statusRef1);
> try
> {
> this.OnStop();
> this.WriteEventLogEntry(Res.GetString("StopSuccessful"));
> this.status.currentState = 1;
> NativeMethods.SetServiceStatus(this.statusHandle,
> service_statusRef1);
> }
> catch (StackOverflowException)
> {
> throw;
> }
> catch (OutOfMemoryException)
> {
> throw;
> }
> catch (ThreadAbortException)
> {
> throw;
> }
> catch (Exception exception1)
> {
> this.WriteEventLogEntry(Res.GetString("StopFailed", new
> object[] { exception1.ToString() }), EventLogEntryType.Error);
> this.status.currentState = num1;
> }
> }
> }
> As you can see, the DeferredStop method catched all the exceptions, so the
> exception in the OnStop method will not trigger our
> AppDomain.UnhandledException event. So was DeferredPause for OnPause
> method.
>
> Hope this helps.
>
> Best regards,
> Jeffrey Tan
> Microsoft Online Community Support
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