c# - How to hide a window using MVVM

Question

I have two windows, I want to hide the one that is executing the opening of the 2nd window.

ViewModel:

public class MainWindowViewModel : INotifyPropertyChanged
{
    private bool _isVisible;
    public bool isVisible
    {
        get { return _isVisible; }
        set
        {
            _isVisible = value;
            NotifyOfPropertyChange("isVisible");
        }
    }

    public MainWindowViewModel()
    {            
        Window1 X = new Window1();
        isVisible = false;
        X.Show();
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected void NotifyOfPropertyChange(string name)
    {           
        PropertyChangedEventHandler handler = PropertyChanged;

        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }
}

The XAML:

<Window.Resources>
    <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"></BooleanToVisibilityConverter>
</Window.Resources>
<Window.Visibility>
    <Binding Path="isVisible" Converter="{StaticResource BooleanToVisibilityConverter}" />
</Window.Visibility>

The new window is showing however the one that is supposed to get hidden is still there and I can't manage to understand why it's happening.

Answer 1

To fix your problem, you must set Mode=TwoWay when binding the Visibility. I don't know why WPF need an explicit declaration like that but I tested and worked.

<Window.Visibility>
    <Binding Path="isVisible" Mode="TwoWay" Converter="{StaticResource BooleanToVisibilityConverter}" />
</Window.Visibility>