該文中使用的串列埠接收資料方法不會造成cpu佔用過高等問題

原始碼地址：https://download.csdn.net/download/horseroll/10756130

demo效果圖：

1.首先宣告一個Serial變數

SerialPort serialPort1 = new SerialPort();

2.進行串列埠連線

public void opencom()
{
    try
    {
        //波特率
        serialPort1.BaudRate = 9600;
        //資料位
        serialPort1.DataBits = 8;
        serialPort1.PortName = comboBox1.Text;
        //兩個停止位
        serialPort1.StopBits = System.IO.Ports.StopBits.One;
        //無奇偶校驗位
        serialPort1.Parity = System.IO.Ports.Parity.None;
        serialPort1.ReadTimeout = 100;
        serialPort1.Open();
        if (!serialPort1.IsOpen)
        {
            MessageBox.Show("埠開啟失敗");
            return;
        }
        else
        {
            richTextBox1.AppendText("埠" + comboBox1.Text + "開啟成功\r\n");
        }
        serialPort1.DataReceived += serialPort1_DataReceived;
    }
    catch (Exception ex)
    {
        serialPort1.Dispose();
        richTextBox1.AppendText(ex.Message);
    }
}
 

3.串列埠接收資料事件

private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    Thread.Sleep(50);  //（毫秒）等待一定時間，確保資料的完整性 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.串列埠傳送資料

serialPort1.Write(textBox1.Text);

5.斷開串列埠

serialPort1.Dispose();

6.附贈方法，得到可用串列埠號

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