C# 串口收发的 例子

//下面是新建的类

using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;
using System.Windows.Forms;

namespace ComTest
{
public class myComC
{
public SerialPort mySerialPort = new SerialPort();
public bool ComOpen()
{
mySerialPort.PortName = "COM0";
mySerialPort.BaudRate = 115200;
mySerialPort.Parity = Parity.None;
mySerialPort.DataBits = 8;
mySerialPort.StopBits = StopBits.One;
mySerialPort.Open();
return mySerialPort.IsOpen ;
}

public void ComClose()
{
mySerialPort.Close();
}

public void ComWrite(byte[] Data, int Length)
{
mySerialPort.Write(Data, 0, Length);
}

public void ComWriteStr(string str)
{
mySerialPort.WriteLine(str);
}

public void ComWriteCommand(byte[] Data)
{
int Length = Data.GetLength(0);
mySerialPort.Write(Data, 0, Length);
}

public void ComWriteStr(String str)
{
mySerialPort.Write(System.Text.Encoding.Default.GetBytes(str), 0, System.Text.Encoding.Default.GetByteCount(str));
}

}
}

用事件触发 串口读
public Form1()
{
InitializeComponent();
myCom.mySerialPort.DataReceived += new SerialDataReceivedEventHandler(myCom_DataReceived);
myCom.mySerialPort.ReceivedBytesThreshold = 1; //指定事件服务程序 并初始话 serialport 事件状态
}

void myCom_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
int n = myCom.mySerialPort.BytesToRead;//先记录下来，避免某种原因，人为的原因，操作几次之间时间长，缓存不一致
byte[] buf = new byte[n];//声明一个临时数组存储当前来的串口数据
received_count += n;//增加接收计数
myCom.mySerialPort.Read(buf, 0, n);//读取缓冲数据

ASCIIEncoding encoding = new ASCIIEncoding();
String constructedString = encoding.GetString(buf, 0, 2);

MessageBox.Show(constructedString);

}