Changing the text of Label won't update the terminal

Changing the text of Label won’t update the terminal unless I move the mouse around in the console frame.

And I don’t find and update methods like label.Update() or label.Refresh().

OS: windows 10, terminal: CMD

[qdwang]

Updating contents in Application.MainLoop.Invoke works for me. Thanks, problem is solved.

[tznind]

I have had a little look. The following minimum example works but if you remove Application.DoEvents() then it doesn’t work (requires the mouse to move before it will update). BDisp was it always like this or is this a regression/deliberate change?

static void Main(string[] args)
{
    Application.Init();

    var w = new Window();
    var lbl = new Label();
    w.Add(lbl);

    var t = new Task(()=>
    {
        while(true)
        {
            lbl.Text = DateTime.Now.ToString();
            lbl.SetNeedsDisplay();
            Application.DoEvents();
            Task.Delay(1000).Wait();
        }
    });

    t.Start();

    Application.Run(w);

    Application.Shutdown();


}

Update: I have checked the previous nuget version and behavior is consistent so it is not a regression. The following also works (and may be more correct). I think invoking on the main loop is the most thread safe way to update UIs in general especially for more complicated controls like TableView where you absolutely want to avoid changing the data in the view during redraw:

var t = new Task(()=>
{
    while(true)
    {
        Application.MainLoop.Invoke(()=>{
            lbl.Text = DateTime.Now.ToString();
            lbl.SetNeedsDisplay();
        });
        Task.Delay(1000).Wait();
    }
});

In fact you can even get rid of SetNeedsDisplay(); in the above example and it still works.