重写Windows基类，自定义WPF窗口，实现改回车键为TAB

在WinForm时，可以定义一个基类继承自Form，从而在基类中重写和添加功能，要在WPF中实现类似方法要分为三步：

１.　自定义一个基类MyWindow继承自Window.

2.　将窗口的CS继承自MyWindow。

3.　在XAML中引用MyWindow命名空间，并在使用其别名自定义WPF窗口。

如下例重写Windows基类，自定义WPF窗口，实现改回车键为TAB：

XAML

<DecorationMS:DMSbase x:Class="DecorationMS.MainWindow"
        xmlns:DecorationMS="clr-namespace:DecorationMS.WindowsBase" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="TEST" Height="700" Width="1000">
    <Grid Name="MainGrid">
      
    </Grid>
</DecorationMS:DMSbase>

    public partial class MainWindow : WindowsBase.DMSbase
    {
        public MainWindow()
        {
            InitializeComponent(); 

        }
     }

自定义基类

 1 using System.Windows;
 2 using System.Windows.Input;
 3 
 4 namespace DecorationMS.WindowsBase
 5 {
 6    public class DMSbase : Window
 7     {
 8         protected override void OnKeyDown(KeyEventArgs e)
 9         {
10             if (e.Key == Key.Enter)
11             {
12                 // MoveFocus takes a TraveralReqest as its argument. 
13                 TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Next);
14 
15                 // Gets the element with keyboard focus. 
16                 UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
17 
18                 // Change keyboard focus. 
19                 if (elementWithFocus != null)
20                 {
21                     elementWithFocus.MoveFocus(request);
22                 }
23                 e.Handled = true;
24             }
25             base.OnKeyDown(e);
26         } 
27 
28 
29     }
30 }