1         /// <summary>
 2         /// 串口读取数据
 3         /// </summary>
 4         private void port_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
 5         {
 6             Thread.Sleep(100);            
 7             if (false == this.port.IsOpen) return;
 8             byte firstByte = Convert.ToByte(port.ReadByte());
 9             if (firstByte == 0x02)
10             {
11                 int bytesRead = port.ReadBufferSize;
12                 byte[] bytesData = new byte[bytesRead];
13                 byte byteData;
14 
15                 for (int i = 0; i < bytesRead - 1; i++)
16                 {
17                     byteData = Convert.ToByte(port.ReadByte());
18                     if (byteData == 0x03)//结束
19                     {
20                         break;
21                     }
22                     bytesData[i] = byteData;
23                 }
24                 strReceive = Encoding.Default.GetString(bytesData);
25             }
26             tbWeight.Invoke(new EventHandler(delegate { tbWeight.Text = GetWeightOfPort(strReceive); }));
27         }
28 
29         /// <summary>
30         /// 返回串口读取的重量
31         /// </summary>
32         /// <param name="?"></param>
33         /// <returns></returns>
34         private string GetWeightOfPort(string weight)
35         {
36             if (string.IsNullOrEmpty(weight) || weight.IndexOf("+") < 0 || weight.Length < 6)
37             {
38                 return "0.000";
39             }
40             weight = weight.Replace("+", "");
41             weight = int.Parse(weight.Substring(0, 3)).ToString() + "." + weight.Substring(3, 3);
42             return weight;
43         }