Question

I started programming just few month ago so I am a pure beginner
but I needed a math app with Heavy probability calculation and an UI to view/interact so I searched around and found C#.net was the best way… fantastic power…

It will help me a lot to progress if I am able do this :

Wpf window with textbox, in textbox a number is printed each time the calculation is done but the Ui should respond everytime

I tried to do it using latest net 4.5 because the app need to be fast (so use the most recent tech and not timer or background task)

and it work but the Ui is stuck and cannot move (because of my bad access to the text box I think)

If guys could help me it will be great and I thank you all because I learned a lot with your posts!

Here is my wrong newbie code

private Random rng;
public MainWindow()
{
    rng = new Random();
    InitializeComponent();
    Task.Run((Func<Task>) Calc);
}
private async Task Calc()
{
    while (true)
    {
        textBox1.Dispatcher.Invoke
             (DispatcherPriority.Normal
              , new Action(delegate() 
                 { 
                     textBox1.Text = rng.NextDouble().ToString(); 
                 }
                          )
              );
    }
}

Answer 1

You’re tightlooping, admittedly in a non-UI-thread, but adding a bazillion delegates to invoke in the UI thread… so your UI is just too busy.

All your work is basically going on in the UI thread at the moment – you’re not even computing rng.NextDouble() in the background thread.

Also note that you’ve got an async method without an await expression, which should have triggered a compiler warning – you should take heed of that.

You say you don’t want to use a “background task” – but that’s exactly what you are doing by calling Task.Run.

Now I’m assuming your real code doesn’t actually just need to create random numbers. What does your real calculation code look like, and which thread does it occur in?