public virtual void DoExecute(object param)
{
// Invoke the executing command, allowing the command to be cancelled.
CancelCommandEventArgs args = new CancelCommandEventArgs()
{
Parameter = param, Cancel = false
};
InvokeExecuting(args);
// If the event has been cancelled, bail now.
if (args.Cancel)
{
return;
}
// Call the action or the parameterized action, whichever has been set.
InvokeAction(param);
// Call the executed function.
InvokeExecuted(new CommandEventArgs()
{
Parameter = param
});
}
protected void InvokeExecuting(CancelCommandEventArgs args)
{
CancelCommandEventHandler executing = Executing;
// Call the executed event.
if (executing != null)
{
executing(this, args);
}
}
public override void DoExecute(object param)
{
// If we are already executing, do not continue.
if (IsExecuting)
{
return;
}
// Invoke the executing command, allowing the command to be cancelled.
CancelCommandEventArgs args = new CancelCommandEventArgs()
{
Parameter = param, Cancel = false
};
InvokeExecuting(args);
// If the event has been cancelled, bail now.
if (args.Cancel)
{
return;
}
// We are executing.
IsExecuting = true;
// Store the calling dispatcher.
#if !SILVERLIGHT
callingDispatcher = Dispatcher.CurrentDispatcher;
#else
callingDispatcher = System.Windows.Application.Current.RootVisual.Dispatcher;
#endif
// Run the action on a new thread from the thread pool (this will therefore work in SL
// and WP7 as well).
ThreadPool.QueueUserWorkItem(
(state) =>
{
// Invoke the action.
InvokeAction(param);
// Fire the executed event and set the executing state.
ReportProgress(
() =>
{
// We are no longer executing.
IsExecuting = false;
// If we were cancelled, invoke the cancelled event - otherwise invoke executed.
if (IsCancellationRequested)
{
InvokeCancelled(new CommandEventArgs()
{
Parameter = param
});
}
else
{
InvokeExecuted(new CommandEventArgs()
{
Parameter = param
});
}
// We are no longer requesting cancellation.
IsCancellationRequested = false;
}
);
}
);
}
