C# WINFORM中捕捉界面中按键ESC

//直接复制此代码到FORM代码下面即可
    protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) //激活回车键
    {
      int WM_KEYDOWN = 256;
      int WM_SYSKEYDOWN = 260;

      if (msg.Msg == WM_KEYDOWN | msg.Msg == WM_SYSKEYDOWN)
      {
        switch (keyData)
        {
          case Keys.Escape:
            bTryLineDraw = false;
            break;
          default:
            break;
        }
      }
      return false;
    }

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