C# 连接SerialPort 报错：已关闭安全控制代码

Question

//调用checkPort("COM1")
   
     public bool checkPort(string ComPort)
        {
            SerialPort comport = new SerialPort();
            comport.PortName = ComPort;
            try
            {
                comport.Open();
                comport.Encoding = Encoding.GetEncoding("GB2312");
                return true;
            }
            catch
            {
                return false;
            }
        }
系统提示：已关闭安全控制代码不知道各位高手是否有遇到这种情况，谢谢！

Answer 1

只看到 comport.Open();没看到close()
出现错误前先close掉
http://hi.baidu.com/jackeyrain/blog/item/f757488b45c6e2dbfc1f10eb.html