How to close dialog window from viewmodel (Caliburn+WPF)?

Question

I haveViewModel1 and View1 associated with it. I start dialog window from ViewModel2 (some another viewmodel) using IWindowManager object. The code from ViewModel2 class:

windowManager.ShowDialog(new ViewModel());

So, I have Dialog Window with View1 user control.

My answer is next - I can close that dialog window using red close button, but how to close it using my specific button (contained in View1 user control), something like "Cancel" button with close command (Command={Binding CancelCommand}), CancelCommand of course is contained in ViewModel1 class.

Answer 1

It's even easier if your view model extends Caliburn.Micro.Screen:

TryClose();

Answer 2

You can get the current view (in your case the dialog window) with implementing the IViewAware interface on your ViewModel. Then you can call Close on the the view (the Window created as the dialog) when your command is executed.

The easiest why is to derive from ViewAware:

public class DialogViewModel : ViewAware
{
    public void ExecuteCancelCommand()
    {
        (GetView() as Window).Close();
    }
}

If you are not allowed to derive you can implement it yourself:

public class DialogViewModel : IViewAware
{
    public void ExecuteCancelCommand()
    {
        dialogWindow.Close();
    }

    private Window dialogWindow;
    public void AttachView(object view, object context = null)
    {
        dialogWindow = view as Window;
        if (ViewAttached != null)
            ViewAttached(this, 
               new ViewAttachedEventArgs(){Context = context, View = view});
    }

    public object GetView(object context = null)
    {
        return dialogWindow;
    }

    public event EventHandler<ViewAttachedEventArgs> ViewAttached;
}

Note: I've used Caliburn.Micro 1.3.1 for my sample.