private static SensLogonEventHandler UnregisterEvent(SensLogonEventHandler original,
SensLogonEventHandler oldDel)
{
original = original - oldDel;
if (original == null)
{
registerCount--;
if (registerCount == 0)
{
//unregister for those events.
SensLogon.eventCatcher.Dispose();
SensLogon.eventCatcher = null;
}
}
return(original);
}
private static SensLogonEventHandler RegisterEvent(SensLogonEventHandler original,
SensLogonEventHandler newDel)
{
bool shouldRegister = (original == null);
original = original + newDel;
if (shouldRegister)
{
if (registerCount <= 0)
{
if (SensLogon.eventCatcher == null)
{
SensLogon.eventCatcher = new SensLogonInterop();
}
registerCount = 1;
}
else
{
//Just count them.
registerCount++;
}
}
return(original);
}