C#中COM串口连接、发送、接收数据

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：https://download.csdn.net/download/horseroll/10756130

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);
}

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