Change WPF mainwindow label from another class and separate thread

dispatcher, mainwindow, wpf

Solution

I resolved my question, hope somebody will need this. But don't know whether this is the optimized way.

In my mainWindow.xaml.cs :

    public  MainWindow()
    {
      main = this;
    }

    internal static MainWindow main;
    internal string Status
    {
        get { return status_lable.Content.ToString(); }
        set { Dispatcher.Invoke(new Action(() => { status_lable.Content = value; })); }
    }

from my SignIn.cs class

 MainWindow.main.Status = "Irantha has signed in successfully";

This works fine for me. You can find more details from here, Change WPF window label content from another class and separate thread

cheers!!

Problem

Im working on a WPF application. I have a label called "Status_label" in `MainWindow.xaml`. and I want to change its content from a different class (signIn.cs). Normally I'm able to do this ``` var mainWin = Application.Current.Windows.Cast<Window>().FirstOrDefault(window => window is MainWindow) as MainWindow; mainWin.status_lable.Content = "Irantha signed in"; ``` But my problem is,when I'm trying to access it via different thread in signIn.cs class, it gives an error: ``` The calling thread cannot access this object because a different thread owns it. ``` Can I solve this by using `Dispatcher.Invoke(new Action(() =>{..........` or something else? EDIT: I'm gonna call this label change action from different class as-well-as separate thread MainWindow.xaml ``` <Label HorizontalAlignment="Left" Margin="14,312,0,0" Name="status_lable" Width="361"/> ``` SignIn.cs ``` internal void getStudentAttendence() { Thread captureFingerPrints = new Thread(startCapturing); captureFingerPrints.Start(); } void mySeparateThreadMethod() { var mainWin = Application.Current.Windows.Cast<Window>().FirstOrDefault(window => window is MainWindow) as MainWindow; mainWin.status_lable.Dispatcher.Invoke(new Action(()=> mainWin.status_lable.Content ="Irantha signed in")); } ``` line var mainWin return error`The calling thread cannot access this object because a different thread owns it.` Please guide me, Thank you

Original source