Command Enabling : Command « Windows Presentation Foundation « VB.Net

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

Command Enabling

      

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="CommandEnabling" Height="300" Width="300"
    >
  <Grid>
    <Menu VerticalAlignment="Top">
      <MenuItem Header="_Edit">
        <MenuItem Command="Redo" />
      </MenuItem>
    </Menu>
  </Grid>
</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 System.Windows.Window
    Public Sub New()
      InitializeComponent()

      Dim redoCommandBinding As New CommandBinding(ApplicationCommands.Redo)
      AddHandler redoCommandBinding.CanExecute, AddressOf RedoCommandCanExecute
      CommandBindings.Add(redoCommandBinding)
    End Sub

    Private Sub RedoCommandCanExecute(sender As Object, e As CanExecuteRoutedEventArgs)
      e.CanExecute = DateTime.Now.Second Mod 2 > 1
    End Sub
  End Class
End Namespace

   
    
    
    
    
    
  

Related examples in the same category

1.	Invoking Copy command with a Button
2.	Button CommandTarget Binding
3.	Creating CommandBinding and attaching an Executed and CanExecute handler
4.	Command Handler Command Binding in Xaml
5.	Property changed callback
6.	Using CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler method
7.	Create CommandBindings in Xaml and bind to Button
8.	Bind TextBox save command to CommandBinding
9.	Press F1 to get help
10.	Help command