Binding Command to ApplicationCommands.New : ApplicationCommand « Windows Presentation Foundation « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows Presentation Foundation
3. ApplicationCommand

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="CommandHandling" Height="300" Width="300"
    >
    <DockPanel>
      <Menu DockPanel.Dock="Top">
        <MenuItem Header="_File">
          <MenuItem Command="New" />
        </MenuItem>
      </Menu>
      <TextBox x:Name="inputBox" TextChanged="OnTextboxTextChanged" />
    </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;


namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        bool unsavedChanges = false;
        
        public Window1()
        {
            InitializeComponent();

            CommandBinding cmdBindingNew = new CommandBinding(ApplicationCommands.New);
            cmdBindingNew.Executed += NewCommandHandler;
            CommandBindings.Add(cmdBindingNew);
        }

        void NewCommandHandler(object sender, ExecutedRoutedEventArgs e)
        {
            if (unsavedChanges)
            {
                MessageBoxResult result = MessageBox.Show(this,"Save changes to existing document?", "New",MessageBoxButton.YesNoCancel);

                if (result == MessageBoxResult.Cancel){
                    return;
                }
                if (result == MessageBoxResult.Yes){
                    SaveChanges();
                }
            }
            inputBox.Clear();
        }
        private void OnTextboxTextChanged(object sender, RoutedEventArgs e){
            unsavedChanges = true;
            Console.WriteLine("changed");
        }

        private void SaveChanges(){
            unsavedChanges = false;
            Console.WriteLine("saved");
        }

    }
}

24.137.ApplicationCommand
	24.137.1.	Bind ApplicationCommand to a handler
	24.137.2.	Assign ApplicationCommands.Open to Button
	24.137.3.	Binding command to ApplicationCommands.Redo
	24.137.4.	Binding Command to ApplicationCommands.New
	24.137.5.	Bind CanExecute to ApplicationCommands.Save
	24.137.6.	Binding ApplicationCommands.New Command to your own handler
	24.137.7.	Change ApplicationCommands.New.Text
	24.137.8.	Call ApplicationCommands.New.Execute to execute the command directly
	24.137.9.	Use CommandBinding to bind ApplicationCommands.New in code
	24.137.10.	Use CommandBinding to Bind to ApplicationCommands
	24.137.11.	Add ApplicationCommands.Cut to TextBox with TextBox.CommandBindings