(求助)串口 winform 调用目标发生异常

Question

sp.DataBits = Form2.DataBits;
            sp.PortName = Form2.PortName;
            if (Form2.StopBits == "1")
            {
                sp.StopBits = StopBits.One;
            }
            if (Form2.StopBits == "1.5")
            {
                sp.StopBits = StopBits.OnePointFive;
            }
            if (Form2.StopBits == "2")
            {
                sp.StopBits = StopBits.Two;
            }
            int[] BaudRate = new int[6];
            BaudRate[0] = 4800;
            BaudRate[1] = 9600;
            BaudRate[2] = 38400;
            BaudRate[3] = 57600;
            BaudRate[4] = 19200;
            BaudRate[5] = 115200;            for (int i = 0; i < 6; i++)
            {
                sp.BaudRate = BaudRate[i];
                for (int n = 0; n < 3; n++)
                {
                    if (n == 0)
                    {
                        sp.Parity = Parity.None;
                    }
                    if (n == 1)
                    {
                        sp.Parity = Parity.Even;
                    }
                    if (n == 2)
                    {
                        sp.Parity = Parity.Odd;
                    }
                    
                        
                        try
                        {
                            sp.Open();
                            toolStripButton1.Text = "串口关闭";                            sp.Write("@#R00000000<");
                            char[] buffer = new char[9];
                            Thread.Sleep(1000);
                            sp.Read(buffer, 0, buffer.Length);
                            if (buffer[0] == 'W')
                            {
                                string xs = sp.PortName + "," + BaudRate[i].ToString() + "," + sp.Parity.ToString() + "," + sp.DataBits + "," + sp.StopBits;
                                toolStripStatusLabel3.Text = xs;
                                MessageBox.Show("检测到电台");
                                qd = buffer;
                                return;
                            }
                            
                        }
                        catch
                        {
                            
                            sp.Close();                        }
                   
                }
            }
            
                MessageBox.Show("未检测到电台");----在这里出现"调用目标发生异常"的信息                toolStripButton1.Text = "串口打开";
                return;
}           
这个问题相当怪,有时出错,有时不会的

Answer 1

你在catch上加Exception参数，然后看ex.Message可能对你有帮助，至少能知道是执行那一步时出错，时好时坏很可能与你的串口设备有关

Answer 2

catch(Exception ex)
{
      MessageBox.Show(ex.ToString());       
      sp.Close();}