c# 如何使Form的内部控件(Control)响应整个Form的按键消息(Event) KeyWord: IMessageFilter

使控件继承IMessageFilter, 随后在IMessageFilter.PreFilterMessage中可以处理WM_KEYDOWN 这类Windows消息
代码类似如下:

  bool IMessageFilter.PreFilterMessage(ref Message m)
        {
            if (m.Msg == (int)norlib.Native.WM.WM_KEYDOWN && m.WParam == (IntPtr)0x11)//0x11 VK_CONTROL
            {
                _controling = false;               
            }
            else if (m.Msg == (int)norlib.Native.WM.WM_KEYUP && m.WParam == (IntPtr)0x11)//0x11 VK_CONTROL
            {
                _controling = true;          
            }
            return false;
        }

最后在控件的构造函数中调用: Application.AddMessageFilter(this);
代码类似如下:

  public PriceLadderTractorControl()
        {
            InitializeComponent();
            Application.AddMessageFilter(this);
            ......
        }