WPF C# – Share Function across pages

July 9, 2024

So i have been banging my head around this problem for about 26 hrs now, and tried a lot of different situations and cant seem to find a solution.

MainWindow

        public async void StatusBox(string data)
        {
                await Task.Delay(500);
                blk_status.Text = data;
                await Task.Delay(3000);
                blk_status.Text = "";
        }

So im looking to call this function from another page so i can send test to that textbox.

Any Ideas? Thanks

Ive tried the Binding with the xaml and MVVM with no results.

>Solution :

You need to get a reference to the MainWindow instance from the page one way or another to begin with.

The easiest way is probably to use the Application.Current.Windows property:

var mainWindow = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
if (mainWindow != null)
    mainWindow.StatusBox("...");

If you use MVVM and bindings, you would typically bind to a command of a parent view model that executes the method. But there is nothing MVVM about your StatusBox method.