前一段时间为了测试硬件产品，发现，串口转发不太方便，于是自己写了一个简单的串口中继小程序，是基于C#开发的，可以将两个串口互通，方便自己在程序的使用，目前看起来应用还可以，现在把源码放这里，供大家参考。

串口使用的是C#提供的控件，直接拖动的控件，实现了相关的事件，界面如图：

核心代码也很简单

        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            Thread.Sleep(200);
            byte[] byteRead = new byte[serialPort1.BytesToRead];
            serialPort1.Read(byteRead, 0, byteRead.Length);
            setText1( "接收数据：" + ToHexStrFromByte(byteRead));
            if (serialPort2.IsOpen == true)
            {
                serialPort2.Write(byteRead, 0, byteRead.Length);
                setText2( "发送数据：" + ToHexStrFromByte(byteRead));
            }
        }

        private void serialPort2_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            Thread.Sleep(200);
            byte[] byteRead = new byte[serialPort2.BytesToRead];
            serialPort2.Read(byteRead, 0, byteRead.Length);
            setText2( "接收数据：" + ToHexStrFromByte(byteRead));
            if (serialPort1.IsOpen == true)
            {
                serialPort1.Write(byteRead, 0, byteRead.Length);
                setText1("发送数据：" + ToHexStrFromByte(byteRead));
            }
        }

为了打印使用的一个小函数：

        /// <summary>
        /// 字节数组转16进制字符串：空格分隔
        /// </summary>
        /// <param name="byteDatas"></param>
        /// <returns></returns>
        public string ToHexStrFromByte(byte[] byteDatas)
        {
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < byteDatas.Length; i++)
            {
                builder.Append(string.Format("{0:X2} ", byteDatas[i]));
            }
            return builder.ToString().Trim();
        }