Question

I working on a project(C# & WPF) where some servers are added to a listbox this way:

ObservableCollection<ServerObjects> servers;
ServerObjects so = getServers();
servers->add(so);

My problem is that this function is blocking and while items are added to my listbox, I can’t select any only after the generating is done(also the program frezes).

So any idee what should I do to make this function asynk?

Thanks.

Answer 1

void addServers(ObservableCollection<ServerObjects> ACollection)
{
    //For Common szenarios dont use new Thread() use instead ThreadPool.QueueUserWorkItem(..) or  the TaskFactory
    Task.Factory.StartNew(()=> this.LoadServer());
}

void MyThreadMethod(Object obj)
{
    ServerObjects so = getServers();

    // The invoke is important, because only the UI Thread should update controls or datasources which are bound to a Control
    UIDispatcher.Invoke(new Action(()=> (obj as ObservableCollection).add(so));
}

You can do is also on RX return an IObservable subscribe on TaskScheduler and observing on Dispatcher.

-> Threadpool vs.s Creating own Thread
-> Build More Responsive Apps With The Dispatcher