解决串口接收中文乱码问题

定义：

SerialPort ComDevice = new SerialPort();

在开启串口前 设置前后文本转换的字符编码 

代码：ComDevice.Encoding = System.Text.Encoding.GetEncoding("GB2312");//此行非常重要 可解决接收中文乱码问题

接收代码：

    #region   串口相关操作

        SerialPort ComDevice = new SerialPort();
        private void GetComList()
        {
            //获取可用串口列表
            string[] ports = SerialPort.GetPortNames();
            foreach (string port in ports)
            {
                cbbComList.Properties.Items.Add(port);
            }
            if (cbbComList.Properties.Items.Count > 0)
            {
                cbbComList.SelectedIndex = 0;
                cbbComList.Enabled = true;
            }
        }

        private void btnComOpen_Click(object sender, EventArgs e)
        {
            if (btnComOpen.Tag.ToString() == "0")
            {
                ComDevice.PortName = cbbComList.SelectedItem.ToString();
                ComDevice.BaudRate = 115200;
                ComDevice.Parity = (Parity)0;
                ComDevice.DataBits = 8;
                ComDevice.StopBits = (StopBits)1;
                ComDevice.Encoding = System.Text.Encoding.GetEncoding("GB2312");//此行非常重要 可解决接收中文乱码问题
                try
                {
                    ComDevice.Open();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
                btnComOpen.Text = "关 闭";
                btnComOpen.Tag = "1";
                picComStatus.Image = Properties.Resources.green;
                ComDevice.DataReceived += new SerialDataReceivedEventHandler(ComDevice_DataReceived);
            }
            else
            {
                try
                {
                    ComDevice.Close();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                btnComOpen.Text = "打 开";
                btnComOpen.Tag = "0";
                picComStatus.Image = Properties.Resources.red;
            }
        }

        /// <summary>
        /// 发送数据 ---此代码在发送时都是转换成十六进制进行发送
        /// </summary>
        private void Send(string cmd, bool HexCmd)
        {
            if (cmd == null)
                return;
            if (cmd.Length > 0)
            {
                if (ComDevice.IsOpen == true)
                {
                    byte[] SendBytes = null;
                    string SendData = cmd;
                    if (HexCmd == true)
                    { //16进制发送
                        try
                        {
                            //剔除所有空格
                            SendData = SendData.Replace(" ", "");
                            if (SendData.Length % 2 == 1)
                            {//奇数个字符
                                SendData = SendData.Remove(SendData.Length - 1, 1);//去除末位字符
                            }
                            List<string> SendDataList = new List<string>();
                            for (int i = 0; i < SendData.Length; i = i + 2)
                            {
                                SendDataList.Add(SendData.Substring(i, 2));
                            }
                            SendBytes = new byte[SendDataList.Count];
                            for (int j = 0; j < SendBytes.Length; j++)
                            {
                                SendBytes[j] = (byte)(Convert.ToInt32(SendDataList[j], 16));
                            }
                        }
                        catch
                        {
                            XtraMessageBox.Show("请输入正确的16进制数据！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        }
                    }
                    else
                    {
                        System.Text.Encoding chs = System.Text.Encoding.GetEncoding("gb2312");
                        byte[] bytes = chs.GetBytes(cmd);
                        string str = "";
                        for (int i = 0; i < bytes.Length; i++)
                        {
                            str += string.Format("{0:X2}", bytes[i]);
                        }
                        List<string> SendDataList = new List<string>();
                        for (int i = 0; i < str.Length; i = i + 2)
                        {
                            SendDataList.Add(str.Substring(i, 2));
                        }
                        SendDataList.Add("0D");
                        SendBytes = new byte[SendDataList.Count];
                        for (int j = 0; j < SendBytes.Length; j++)
                        {
                            SendBytes[j] = (byte)(Convert.ToInt32(SendDataList[j], 16));
                        }
                    }
                    ComDevice.Write(SendBytes, 0, SendBytes.Length);//发送数据
                }
                else
                {
                    XtraMessageBox.Show("请打开串口！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }


        #region 接收数据
        private void ComDevice_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
           UpdateRecevie(ComDevice.ReadExisting());
        }

        public delegate void UpdateString(object NewData);
        public void UpdateRecevie(object NewData)
        {
            if (this.InvokeRequired)//等待异步
            {
                UpdateString _myInvoke = new UpdateString(UpdateRecevie);
                this.Invoke(_myInvoke, new object[] { NewData });
            }
            else
            {
                txtComReceive.AppendText(NewData.ToString());
                txtComReceive.SelectionStart = txtComReceive.Text.Length - 1;
                txtComReceive.ScrollToCaret();
            }
        }
        #endregion