WPf 使用KeyDown后屏蔽方向键导致的焦点移动

    private void MainWindows_KeyDown(object sender, KeyEventArgs e)
        {

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

                Last_Click(null, null);
                //取消该事件不然会移动焦点
                e.Handled = true;      

            }
            else

            if (e.KeyStates == Keyboard.GetKeyStates(Key.Right))
            {
                Next_Click(null , null);
                //取消该事件,不然会移动焦点
                e.Handled = true;       
               
            }
        }

 KeyDown="MainWindows_KeyDown"