SerialPort serialPort1 = new SerialPort(“COM5”, 115200, Parity.None, 8, StopBits.One); //初始化串口设置
//定义委托
public delegate void Displaydelegate(byte[] InputBuf);
Byte[] OutputBuf = new Byte[8];
public Displaydelegate disp_delegate;

//接收数据委托
disp_delegate = new Displaydelegate(DispUI);
serialPort1.DataReceived += new SerialDataReceivedEventHandler(Comm_DataReceived);

//串口读取数据处理函数
public void Comm_DataReceived(object sender, SerialDataReceivedEventArgs e)
{

Byte[] InputBuf = new Byte[8];

try
{
serialPort1.Read(InputBuf, 0,6); //读取缓冲区的数据,每次读取6个字节的数据
System.Threading.Thread.Sleep(100);
this.BeginInvoke(disp_delegate, InputBuf);//disp_delegate是定义的委托事件，在委托事件中调用修改UI的程序
}
catch (TimeoutException ex) //超时处理
{
MessageBox.Show(ex.ToString());
}

}

//更新UI界面
public void DispUI(byte[] InputBuf)
{

string str = System.Text.Encoding.Default.GetString(InputBuf);
// Console.WriteLine(str);
string strW = str.Substring(0, 2);//截取str的子串，从index=0开始截取长度为2的字符串
int OutStrW = int.Parse(strW);
string strS = str.Substring(2, 2);//截取str的子串，从index=2开始截取长度为2的字符串
int OutStrS = int.Parse(strS);
OutstrWen = (OutStrW - 4).ToString();
textBox8.Text = strW;
textBox9.Text = (OutStrW - 4).ToString();
textBox10.Text = strS;
textBox11.Text = (OutStrS - 10).ToString();
}