在winform中捕获上下左右键等控制键的按键事件

重写Control的ProcessDialogKey方法，此处以winform表单为例：

protected override bool ProcessDialogKey(Keys keyData)
        {
            Control control = this.GetFocusedControl();
            this.MoveControlByKeys(keyData, control);
            return base.ProcessDialogKey(keyData);
        }
        /// <summary>
        /// 根据keyData的值移动控件control
        /// </summary>
        /// <param name="keyData"></param>
        /// <param name="control"></param>
        private void MoveControlByKeys(Keys keyData, Control control)
        {
            if (keyData == Keys.Left)
            {
                if (control.Location.X > 0)
                {
                    control.Location = new Point(control.Location.X - 1, control.Location.Y);
                }
            }
            else if (keyData == Keys.Right)
            {
                control.Location = new Point(control.Location.X + 1, control.Location.Y);
            }
            else if (keyData == Keys.Up)
            {
                if (control.Location.Y > 0)
                {
                    control.Location = new Point(control.Location.X, control.Location.Y - 1);
                }
            }
            else if (keyData == Keys.Down)
            {
                control.Location = new Point(control.Location.X, control.Location.Y + 1);
            }
        }

        //API声明：获取当前焦点控件句柄    
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Winapi)]
        internal static extern IntPtr GetFocus();
        ///获取 当前拥有焦点的控件
        private Control GetFocusedControl()
        {
            Control focusedControl = null;
            // To get hold of the focused control:
            IntPtr focusedHandle = GetFocus();
            if (focusedHandle != IntPtr.Zero)
                //focusedControl = Control.FromHandle(focusedHandle);
                focusedControl = Control.FromChildHandle(focusedHandle);
            return focusedControl;
        }