C# serial port Chinese GBK or UTF-8 normal serial port assistant source code to receive the whole data of the MCU

Set the encoding method in the serial port initialization:

mycomm.Encoding = System.Text.Encoding.GetEncoding("UTF-8");//Choose UTF-8 or GB2312 according to the actual situation
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Windows.Forms.DataVisualization.Charting;
using System.Drawing.Drawing2D;
using SerialCommDemo.Properties;
using System.Threading;
namespace SerialCommDemo
{
    public partial class Form1 : Form
    {
        //public string fileName = "配置.txt";
        public Form1()
        {
            InitializeComponent();
        }
        public Boolean SendByte(byte b)
        {
            if (!mycomm.IsOpen)
            {
                MessageBox.Show("串口没有打开，请打开串口！");
                return false;
            }
            byte[] package = { b };
            mycomm.Write(package, 0, package.Length);//向串口发送一包的数据 
            return false;
        }
        public Boolean SendArr(byte[] package)
        {
            if (!mycomm.IsOpen)
            {
                MessageBox.Show("串口没有打开，请打开串口！");
                return false;
            }
            mycomm.Write(package, 0, package.Length);//向串口发送一包（18字节）的数据 
            return false;
        }
        public byte[] hexConvertToByteArray(String str)
        {
            str = str.Replace(" ", "");
            byte[] b = new byte[str.Length / 2];
            for (int i = 0; i < str.Length; i = i + 2)
            {
                b[i / 2] = (byte)Convert.ToInt32(str.Substring(i, 2), 16);   //将十六进制“10”转换为十进制i
            }
            return b;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //this.SendArr(hexConvertToByteArray(textBoxSend.Text));//十六进制
            mycomm.Write(textBoxSend.Text); //字符
        }

        private void comm_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            Thread.Sleep(1000);//这个延时非常重要 等整条数据接收完
            if (mycomm.BytesToRead > 0)
            {
                //因为要访问ui资源，所以需要使用invoke方式同步ui。
                this.Invoke((EventHandler)(delegate
                {
                    //byte[] bytes = new byte[mycomm.BytesToRead];
                    //mycomm.Read(bytes, 0, bytes.Length);
                    //textBoxRx.Text = "" + System.Text.Encoding.Default.GetString(bytes);

                     textBoxRx.Text=(mycomm.ReadExisting());    //汉字正常了 字符模式

                    //十六进制
                    //byte[] data = new byte[mycomm.BytesToRead];                                //定义缓冲区，因为串口事件触发时有可能收到不止一个字节
                    //mycomm.Read(data, 0, data.Length);
                    //foreach (byte Member in data)                                                   //遍历用法
                    //{
                    //    string str = Convert.ToString(Member, 16).ToUpper();
                    //    textBoxRx.AppendText("0x" + (str.Length == 1 ? "0" + str : str) + " ");
                    //}




                }));
            }
        }

        private void btnOpen_Click(object sender, EventArgs e)
        {
            if (mycomm.IsOpen)
            {
                mycomm.Close();
                btnOpen.Text = "打开串口";
                uartStatus();//(false);
            }
            else
            {
                try
                {
                    mycomm.PortName = comboBoxPortSelect.Text;
                    mycomm.ReadTimeout = 32;
                    mycomm.Encoding = System.Text.Encoding.GetEncoding("UTF-8");//根据实际情况选择UTF-8还是GB2312

                    mycomm.Open();
                    btnOpen.Text = "关闭串口";//按钮打开
                    uartStatus();//(true);
                }
                catch
                {
                    btnOpen.Text = "打开串口";
                    MessageBox.Show("没有发现串口或串口已被占用！");
                    uartStatus();//(false);
                }
            }
        }

        private void comboBoxPortSelect_SelectedIndexChanged(object sender, EventArgs e)
        {
            mycomm.Close();
            mycomm.PortName = comboBoxPortSelect.Text;
            btnOpen_Click(null,null); //重新打开
        }
        private void uartStatus()
        {
            if (mycomm.IsOpen)
            {
                Settings.Default.comIndex = comboBoxPortSelect.SelectedIndex; //保存上次成功打开的端口
                Properties.Settings.Default.Save();//使用Save方法保存更改
                pictureBox1.Image = Properties.Resources.LED_OnR;
            }
            else
                pictureBox1.Image = Properties.Resources.LED_OffR;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            textBoxInterval.Text = Settings.Default.interval;
            string[] ports = SerialPort.GetPortNames();
            Array.Sort(ports);
            comboBoxPortSelect.Items.AddRange(ports);
            if (Settings.Default.comIndex >= ports.Length)
            {
                //默认选中第一个
                comboBoxPortSelect.SelectedIndex = 0;
            }
            else
                comboBoxPortSelect.SelectedIndex = Settings.Default.comIndex;


           // btnOpen_Click(null, null);//打开本计算机的串口  
            //添加事件注册
            mycomm.DataReceived += comm_DataReceived;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {

            if (mycomm.IsOpen)
            {
                //timer1.Interval = Convert.ToInt32(this.textBoxInterval.Text);//设置timer1的timer1_Tick实践执行周期为N毫秒
                this.SendArr(hexConvertToByteArray(textBoxSend.Text));
            }
            else
            {
                timer1.Enabled = false;
            }
        }

        private void buttonAuto_Click(object sender, EventArgs e)
        {
            buttonAuto.Enabled = false;
            timer1.Interval = Convert.ToInt32(this.textBoxInterval.Text);//设置timer1的timer1_Tick实践执行周期为N毫秒
            timer1.Enabled = true;//设置为truetimer1_Tick实践就会执行，开始计时
        }

        private void buttonDoor1_Click(object sender, EventArgs e)
        {
            textBoxSend.Text = "{\"cmd\":\"control\",\"smartId\":\"6359\",\"smartChannel\":\"1\",\"sensorId\":\"6361\",\"sensorChannel\":\"1\",\"para\":\"1\"}";
            button1_Click(null, null);
        }

        private void buttonDoor2_Click(object sender, EventArgs e)
        {
            textBoxSend.Text = "{\"cmd\":\"control\",\"smartId\":\"6359\",\"smartChannel\":\"1\",\"sensorId\":\"6362\",\"sensorChannel\":\"3\",\"para\":\"1\"}";
            button1_Click(null,null);
        }

        private void buttonUPSOpen_Click(object sender, EventArgs e)
        {
            textBoxSend.Text = "{\"cmd\":\"control\",\"smartId\":\"6358\",\"smartChannel\":\"1\",\"sensorId\":\"6437\",\"sensorChannel\":\"1\",\"para\":\"1\"}";
            button1_Click(null, null);
        }

        private void buttonUPSClose_Click(object sender, EventArgs e)
        {
            textBoxSend.Text = "{\"cmd\":\"control\",\"smartId\":\"6358\",\"smartChannel\":\"0\",\"sensorId\":\"6437\",\"sensorChannel\":\"0\",\"para\":\"0\"}";
            button1_Click(null, null);
        }


    }
}