Why does unloaded event of window do not fire in WPF?

Question

In my WPF application I have created a window and show it as a dialog by calling it by the method ShowDialog(). But when I close the window by Close() method the Unloaded ev

Answer 1

I stumbled on this work-around by accident. I happened to create another window in my code and therefore did not see the issue of Unloaded Event not firing in WPF.

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();

        new Window(); //<-- this will make Unloaded Event to trigger in WPF
    }
}

The work-around also works in MVVM pattern!

Ignore the rest of the code below if you don't do MVVM pattern.

XAML (Requires reference to System.Windows.Interactivity)

Code behind

    public ICommand WindowUnLoadEventHandler
    {
        get
        {
            if (_windowUnload == null)
            {
                _windowUnload = new MyDelegateCommand(ExecuteWindowUnLoadEventHandler);
            }
            return _windowUnload;
        }
    }

    private void ExecuteWindowUnLoadEventHandler(object parameter)
    {
        //Do your thing
    }

MyDelegateCommand

public class MyDelegateCommand : ICommand
{
    private readonly Action