C# wpf multiple windows on task bar

Question

I created a C# project which have multiple windows. When I do some other stuff, some of the windows are lost focus. Then I have to bring them to front by clicking the task bar one by one.

I am wondering is there are OnTaskBarClick Event on C# wpf window?

Then What I need to do is to set all sub windows with "ShowInTaskbar="False"". Then when ever my mainwindow is clicked on the task bar, I bring all the windows to the front.

Answer 1

You'll want to use the Window.Activated event to detect when your application's window is brought into focus:

From the documentation:

A window is activated (becomes the foreground window) when:

• The window is first opened.

• A user switches to a window by selecting it with the mouse, pressing ALT+TAB, or from Task Manager.

• A user clicks the window's taskbar button.

Or you could use the Application.Activated event.

Clicking on a control of an already active window can also cause the Window.Activated event to fire, so if the issue is that it's firing too often, you'll probably want to watch for when the application toggles between being active and deactive.

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        Application.Current.Activated += CurrentOnActivated;
        Application.Current.Deactivated += CurrentOnDeactivated;

    }

    private bool isDeactivated = true;

    private void CurrentOnDeactivated(object sender, EventArgs eventArgs)
    {
        isDeactivated = true;
        //handle case where another app gets focus
    }

    private void CurrentOnActivated(object sender, EventArgs eventArgs)
    {
        if (isDeactivated)
        {
            //Ok, this app was in the background but now is in the foreground,
            isDeactivated = false;

            //TODO: bring windows to forefont                
            MessageBox.Show("activated");

        }
    }
}