File Menu, new MenuItem : Command « Windows Presentation Foundation « C# / CSharp Tutorial






<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");
        }

    }
}
WPF Text Box Text Changed Event








24.135.Command
24.135.1.Built-In Command BindingsBuilt-In Command Bindings
24.135.2.Help commandHelp command
24.135.3.Button CommandTarget BindingButton CommandTarget Binding
24.135.4.Creating CommandBinding and attaching an Executed and CanExecute handlerCreating CommandBinding and attaching an Executed and CanExecute handler
24.135.5.Creating a KeyBinding between the Open command and Ctrl-RCreating a KeyBinding between the Open command and Ctrl-R
24.135.6.Command Handler Command Binding in XamlCommand Handler Command Binding in Xaml
24.135.7.Command Handler Key BindingCommand Handler Key Binding
24.135.8.Bind the Button to a CommandBind the Button to a Command
24.135.9.Command EnablingCommand Enabling
24.135.10.Using CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler methodUsing CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler method
24.135.11.Create CommandBindings in Xaml and bind to ButtonCreate CommandBindings in Xaml and bind to Button
24.135.12.Bind TextBox save command to CommandBindingBind TextBox save command to CommandBinding
24.135.13.Use TextBox.CommandBindingst to bind commandUse TextBox.CommandBindingst to bind command
24.135.14.Parse command line arguments and make them available to an application.Parse command line arguments and make them available to an application.
24.135.15.Handle a Button Click with Shared button click handlerHandle a Button Click with Shared button click handler
24.135.16.File Menu, new MenuItemFile Menu, new MenuItem
24.135.17.Cancel an eventCancel an event
24.135.18.Bind the command to the event handlers with CommandBindings