Give some command to View in MVVM

Question

Let\'s imagine I have some user control. The user control has some child windows. And user control user wants to close child windows of some type. There is a method in user

Answer 1

One way to achieve this would be for the view-model to request that the child windows should be closed:

public class ExampleUserControl_ViewModel
{
    public Action ChildWindowsCloseRequested;

    ...
}

The view would then subscribe to its view-model's event, and take care of closing the windows when it's fired.

public class ExampleUserControl : UserControl
{
    public ExampleUserControl()
    {
        var viewModel = new ExampleUserControl_ViewModel();
        viewModel.ChildWindowsCloseRequested += OnChildWindowsCloseRequested;

        DataContext = viewModel;
    }

    private void OnChildWindowsCloseRequested()
    {
        // ... close child windows
    }

    ...
}

So here the view-model can ensure the child windows are closed without having any knowledge of the view.