Binding Command to ApplicationCommands.New : ApplicationCommands « Windows Presentation Foundation « VB.Net

1. VB.Net
2. Windows Presentation Foundation
3. ApplicationCommands

Binding Command to ApplicationCommands.New

     

<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.vb
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes


Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Private unsavedChanges As Boolean = False

    Public Sub New()
      InitializeComponent()

      Dim cmdBindingNew As New CommandBinding(ApplicationCommands.[New])
      AddHandler cmdBindingNew.Executed, AddressOf NewCommandHandler
      CommandBindings.Add(cmdBindingNew)
    End Sub

    Private Sub NewCommandHandler(sender As Object, e As ExecutedRoutedEventArgs)
      If unsavedChanges Then
        Dim result As MessageBoxResult = MessageBox.Show(Me, "Save changes to existing document?", "New", MessageBoxButton.YesNoCancel)

        If result = MessageBoxResult.Cancel Then
          Return
        End If
        If result = MessageBoxResult.Yes Then
          SaveChanges()
        End If
      End If
      inputBox.Clear()
    End Sub
    Private Sub OnTextboxTextChanged(sender As Object, e As RoutedEventArgs)
      unsavedChanges = True
      Console.WriteLine("changed")
    End Sub

    Private Sub SaveChanges()
      unsavedChanges = False
      Console.WriteLine("saved")
    End Sub

  End Class
End Namespace

   
    
    
    
    
  

Related examples in the same category

1.	Without focus scope
2.	Bind ApplicationCommand to a handler
3.	Assign ApplicationCommands.Open to Button
4.	Menu with Application command: cut, copy, paste
5.	Binding command to ApplicationCommands.Redo
6.	Bind CanExecute to ApplicationCommands.Save
7.	Binding ApplicationCommands.New Command to your own handler
8.	Change ApplicationCommands.New.Text
9.	Call ApplicationCommands.New.Execute to execute the command directly
10.	Use CommandBinding to bind ApplicationCommands.New in code
11.	Use CommandBinding to Bind to ApplicationCommands
12.	Add ApplicationCommands.Cut to TextBox with TextBox.CommandBindings