第一步：加入串口控件

第二步：加入模块

using System.IO.Ports;

第三步：编写相关函数功能

获取所有串口资源

SerialPort.GetPortNames();

设置和打开

serialPort1.PortName = comboBox1.Text;
serialPort1.BaudRate = Convert.ToInt32(comboBox2.Text);
serialPort1.DataBits = Convert.ToInt32(comboBox3.SelectedItem.ToString());
serialPort1.StopBits = (StopBits)Convert.ToInt32(comboBox4.SelectedItem.ToString());
serialPort1.Parity = (Parity)Convert.ToInt32(comboBox5.SelectedIndex.ToString());

关闭串口

serialPort1.Close();

发送字符串（string）

serialPort1.WriteLine(data[i].ToString());

发送byte

serialPort1.Write(data, 0, 13);

提示

• 参数1:pointer to a byte array
• 参数2:offset
• 参数3:number of these bytes

检查串口状态

if (serialPort1.IsOpen == true)
{
    ...
}

接受byte

//receive data
byte[] rbuf=new byte[13];
serialPort1.Read(rbuf, 0, 13);

查询所有可用串口

RegistryKey keyCom = Registry.LocalMachine.OpenSubKey("Hardware\\DeviceMap\\SerialComm");
if (keyCom != null)
{
    string[] sSubKeys = keyCom.GetValueNames();
    scom.Items.Clear();
    foreach (string sName in sSubKeys)
    {
      string sValue = (string)keyCom.GetValue(sName);
       scom.Items.Add(sValue);
     }
}