WPf 使用KeyDown後屏蔽方向鍵導致的焦點移動

    private void MainWindows_KeyDown(object sender, KeyEventArgs e)
        {

            if (e.KeyStates == Keyboard.GetKeyStates(Key.Left))
            {

                Last_Click(null, null);
                //取消該事件不然會移動焦點
                e.Handled = true;      

            }
            else

            if (e.KeyStates == Keyboard.GetKeyStates(Key.Right))
            {
                Next_Click(null , null);
                //取消該事件,不然會移動焦點
                e.Handled = true;       
               
            }
        }

 KeyDown="MainWindows_KeyDown"