WPF 窗体基类实现的体验及实现回车到下一控件

1、窗体基类实现参考

http://weblogs.asp.net/psheriff/archive/2009/11/02/creating-a-base-window-class-in-wpf.aspx

2、基类不能像WinForm窗体一样写Loaded事件（写了也是不执行的）

没办法只好写一个方法让所有继承者调用了

3、回车键改为TAB的实现

        /// <summary>
        /// 将回车改为TAB
        /// </summary>
        /// <param name="e"></param>
        protected override void OnKeyDown(System.Windows.Input.KeyEventArgs e)
        {
            if (e.Key == System.Windows.Input.Key.Enter)
            {
                // MoveFocus takes a TraveralReqest as its argument.
                TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Next);
                // Gets the element with keyboard focus.
                UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
                // Change keyboard focus.
                if (elementWithFocus != null)
                {
                    elementWithFocus.MoveFocus(request);
                }
                e.Handled = true;
            }
            base.OnKeyDown(e);
        }

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