StackPanel PreviewTextInput and PreviewKeyDown

  


<Window x:Class="RoutedEvents.OnlyNumbers"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Only Numbers" Height="300" Width="300">
    <StackPanel Margin="5" PreviewTextInput="pnl_PreviewTextInput" PreviewKeyDown="pnl_PreviewKeyDown">
        <TextBox Margin="3" AcceptsTab="False"></TextBox>
        <TextBox Margin="3"></TextBox>
        <TextBox Margin="3"></TextBox>
    </StackPanel>
    
</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 RoutedEvents
{
    public partial class OnlyNumbers : System.Windows.Window
    {
        public OnlyNumbers()
        {
            InitializeComponent();
        }
        private void pnl_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            short val;
            if (!Int16.TryParse(e.Text, out val))
            {
                e.Handled = true;
            }            
        }

        private void pnl_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Space)
            {
                e.Handled = true;
            }
        }
    }
}

1.	Query Left / Right control key
2.	Query Left / Right Shift key
3.	Is Key.CapsLock Toggled
4.	Keyboard.IsKeyToggled
5.	Query Number lock key
6.	Use Keyboard.Focus to set the focus to a Text Field
7.	Programmatically Extract an Element's Style with DefaultStyleKeyProperty
8.	Provide Quick Keyboard Access to Buttons
9.	Reading keyboard modifiers
10.	Reading individual key state with Keyboard.IsKeyDown
11.	Suppress Keyboard and Mouse Events
12.	Use KeyBinding to bind Key event to TextBox.InputBindings
13.	If input is not a number do not handle the key event
14.	On Key Down Handler

StackPanel PreviewTextInput and PreviewKeyDown : Key Event « Windows Presentation Foundation « C# / C Sharp

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