dispatcher

I'm building a chat client and am not 100% sure on how to use the dispatcher . So the question is I have a method as such: public void LostConnection() { myGUI.chatBox.AppendText("Lost connection to room: "+ myGUI.UsernameText.ToString() + "\r\n"); } Do i need to surrond the statement within (myGUI.chatBox... ) with a Dispatcher.Invoke ? I appreciate any help. Ricibob Your app has a main UI thread (usually ManagedThreadId==1 ). Typically in a chat app your events will come in on other threads (either dedicated socket listen threads or thread pool threads from listening code). If you want to

I've used volatile where I'm not sure it is necessary. I was pretty sure a lock would be overkill in my situation. Reading this thread (Eric Lippert comment) make me anxious on my usage of volatile: When should the volatile keyword be used in c# ? I used volatile because my variable is use in a Multithreaded context where this variable could be accessed/modified concurrently, but where I can loose an addition without any hurts (see code). I added "volatile" to make sure that there is no miss alignment occurring: reading only 32 bits of the variable and the other 32 bits on another fetch which

I'm supposed to be able to access the Dispatcher that belongs to the View I need to pass it to the ViewModel. But the View should not know anything about the ViewModel, so how do you pass it? Introduce an interface or instead of passing it to the instances create a global dispatcher singleton that will be written by the View? How do you solve this in your MVVM applications and frameworks? EDIT: Note that since my ViewModels might be created in background threads I can't just do Dispatcher.Current in the constructor of the ViewModel. Matthias I have abstracted the Dispatcher using an interface

I'm having trouble getting the Dispatcher to run a delegate I'm passing to it when unit testing. Everything works fine when I'm running the program, but, during a unit test the following code will not run: this.Dispatcher.BeginInvoke(new ThreadStart(delegate { this.Users.Clear(); foreach (User user in e.Results) { this.Users.Add(user); } }), DispatcherPriority.Normal, null); I have this code in my viewmodel base class to get a Dispatcher: if (Application.Current != null) { this.Dispatcher = Application.Current.Dispatcher; } else { this.Dispatcher = Dispatcher.CurrentDispatcher; } Is there

I tried to use the below code to make a 2 second delay before navigating to the next window. But the thread is invoking first and the textblock gets displayed for a microsecond and landed into the next page. I heard a dispatcher would do that. Here is my snippet: tbkLabel.Text = "two mins delay"; Thread.Sleep(2000); Page2 _page2 = new Page2(); _page2.Show(); Phil The call to Thread.Sleep is blocking the UI thread. You need to wait asynchronously. Method 1: use a DispatcherTimer tbkLabel.Text = "two seconds delay"; var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(2) }; timer

What event system for Python do you use? I'm already aware of pydispatcher , but I was wondering what else can be found, or is commonly used? I'm not interested in event managers that are part of large frameworks, I'd rather use a small bare-bones solution that I can easily extend. Wrapping up the various event systems that are mentioned in the answers here: The most basic style of event system is the 'bag of handler methods', which is a simple implementation of the Observer pattern . Basically, the handler methods (callables) are stored in an array and are each called when the event 'fires'.