本文共 1540 字，大约阅读时间需要 5 分钟。

该文中使用的串口接收数据方法不会造成cpu占用过高等问题

源码地址：

demo效果图：

1.首先声明一个Serial变量

SerialPort serialPort1 = new SerialPort();

2.进行串口连接

public void opencom(){    try    {        //波特率        serialPort1.BaudRate = 9600;        //数据位        serialPort1.DataBits = 8;        serialPort1.PortName = comboBox1.Text;        //两个停止位        serialPort1.StopBits = System.IO.Ports.StopBits.One;        //无奇偶校验位        serialPort1.Parity = System.IO.Ports.Parity.None;        serialPort1.ReadTimeout = 100;        serialPort1.Open();        if (!serialPort1.IsOpen)        {            MessageBox.Show("端口打开失败");            return;        }        else        {            richTextBox1.AppendText("端口" + comboBox1.Text + "打开成功\r\n");        }        serialPort1.DataReceived += serialPort1_DataReceived;    }    catch (Exception ex)    {        serialPort1.Dispose();        richTextBox1.AppendText(ex.Message);    }}

3.串口接收数据事件

private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e){    Thread.Sleep(50);  //（毫秒）等待一定时间，确保数据的完整性 int len            int len = serialPort1.BytesToRead;    string receivedata = string.Empty;    if (len != 0)    {        byte[] buff = new byte[len];        serialPort1.Read(buff, 0, len);        receivedata = Encoding.Default.GetString(buff);                    }    richTextBox1.AppendText(receivedata + "\r\n");}

4.串口发送数据

serialPort1.Write(textBox1.Text);

5.断开串口

serialPort1.Dispose();

6.附赠方法，得到可用串口号

String[] portnames = SerialPort.GetPortNames();foreach (var item in portnames){    comboBox1.Items.Add(item);}

转载地址：http://xuulf.baihongyu.com/