CODEWITHSUNDEEP
wpfmvvmviewmodelmahapps.metro
eYe
eYe

Reputation: 1733

How to access ShowMessageAsync method of MetroWindow from ViewModel

I am using MahApps.metro WPF library with MVVM. I have a ViewModel from which I need to display a Dialog. The MetroWindow has ShowMessageAsync. But what is the proper way to access it from the ViewModel? As I understand I need a View instance but passing that into the ViewModel doesn't seem like a good approach.

Upvotes: 1

Views: 911

Answers (1)

Nitin Joshi
Nitin Joshi

Reputation: 1668

Use following approach:

  1. Take an Action<T> ShowMessageAsync in your ViewModel which you are binding with window.

  2. Now create a behaviour for Window and use following code in behaviour

    protected override void OnAttached()
{
    base.OnAttached();
    this.AssociatedObject.Loaded += AssociatedObject_Loaded;
}

void AssociatedObject_Loaded(object sender, RoutedEventArgs e)
{
    if (this.AssociatedObject.DataContext is WindowViewModel)
    {
        WindowViewModel vm = this.AssociatedObject.DataContext as WindowViewModel;

        vm.ShowMessageAsync = OnShowMessageAsync;
    }
}

private void OnShowMessageAsync(T param)
{ 
         //Write your logic to call ShowMessageAsync method.
}

Now in this way, from the ViewModel of your MainWindow you will have ability to open another child window.

Upvotes: 1

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