WPF MVVM: How to close a window

Question

I have a Button that closes my window when it\'s clicked:

Ok

Answer 1

I have following solution in Silverlight. Would also be in WPF.

ChildWindowExt.cs:

namespace System.Windows.Controls
{
    public class ChildWindowExt : ChildWindow
    {
        public static readonly DependencyProperty IsOpenedProperty =
          DependencyProperty.Register(
          "IsOpened",
          typeof(bool),
          typeof(ChildWindowExt),
          new PropertyMetadata(false, IsOpenedChanged));

        private static void IsOpenedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if ((bool)e.NewValue == false)
            {
                ChildWindowExt window = d as ChildWindowExt;
                window.Close();
            }
            else if ((bool)e.NewValue == true)
            {
                ChildWindowExt window = d as ChildWindowExt;
                window.Show();
            }
        }

        public bool IsOpened
        {
            get { return (bool)GetValue(IsOpenedProperty); }
            set { SetValue(IsOpenedProperty, value); }
        }

        protected override void OnClosing(ComponentModel.CancelEventArgs e)
        {
            this.IsOpened = false;
            base.OnClosing(e);
        }

        protected override void OnOpened()
        {
            this.IsOpened = true;
            base.OnOpened();
        }
    }
}

ItemWindow.xaml:

ItemViewModel.cs:

private bool _IsOpened;
public bool IsOpened
{
    get
    {
        return _IsOpened;
    }
    set
    {
        if (!Equals(_IsOpened, value))
        {
            _IsOpened = value;
            RaisePropertyChanged("IsOpened");
        }
    }
}

private RelayCommand _UpdateCommand;
/// 

/// Insert / Update data entity
/// 
public RelayCommand UpdateCommand
{
    get
    {
        if (_UpdateCommand == null)
        {
            _UpdateCommand = new RelayCommand(
                () =>
                {
                    // Insert / Update data entity
                    ...

                    IsOpened = false;
                },
                () =>
                {
                    return true;
                });
        }
        return _UpdateCommand;
    }
}

ItemsViewModel.cs:

    private RelayCommand _InsertItemCommand;
    /// 

    /// 
    /// 
    public RelayCommand InsertItemCommand
    {
        get
        {
            if (_InsertItemCommand == null)
            {
                _InsertItemCommand = new RelayCommand(
                    () =>
                    {
                        ItemWindow itemWin = new ItemWindow();
                        itemWin.DataContext = new ItemViewModel();
                        itemWin.Show();

                        // OR

                        // ItemWindow itemWin = new ItemWindow();
                        // ItemViewModel newItem = new ItemViewModel();
                        // itemWin.DataContext = newItem;
                        // newItem.IsOpened = true;

                    },
                    () =>
                    {
                        return true;
                    });
            }
            return _InsertItemCommand;
        }
    }

MainPage.xaml:

I wish you all good ideas and projects ;-)