.NET WinForm读取扫描枪从COM口传过来的数据，显示在TextBox中，并做其他操作。

 1   private string portName = "";   //串口
 2         private int baudRate = 0;         //速率
 3         private int dataBits = 0;         //数据位        
 4         int scanNum = 0;
 5         int noRead = 0;
 6         string strReceive = "";
 7         string serialNumber = "";
 8         string url = "";
 9         int SocketPort = 0;
10         bool isDispose = false;//是否在处理COM数据,true为正在处理，false空闲
11         private void DataReceived(object sender, SerialDataReceivedEventArgs e)
12         {
13             try
14             {
15                 strReceive = ReadCOM.serialport.ReadExisting();
16                 if (string.IsNullOrEmpty(strReceive))
17                 {
18                     return;
19                 }
20                 else
21                 {
22                     if (!isDispose)
23                     {
24                         BackgroundWorker bgWorker = new BackgroundWorker();
25                         bgWorker.DoWork += new DoWorkEventHandler(bgWorker_DoWork);
26                         bgWorker.RunWorkerAsync(strReceive);
27                         return;
28                     }
29                 }
30             }
31             catch (System.Exception ex)
32             {
33                 throw new Exception(ex.Message);
34             }
35 
36         }
37         private void bgWorker_DoWork(object sender, DoWorkEventArgs e)
38         {
39             isDispose = true;
40             this.Invoke((EventHandler)(delegate
41             {
42                 this.txtGlassID.Text = strReceive;
43                 this.txtGlassID.Refresh();
44                 KeyEventArgs ev = new KeyEventArgs(Keys.Enter);
45                 txtGlassID_KeyDown(sender, ev);
46                 isDispose = false;
47 
48             }));
49         }
50         private void OpenPort()
51         {
52             if (ReadCOM.serialport.IsOpen)
53             {
54                 ReadCOM.serialport.Close();
55             }
56             ReadCOM.serialport.PortName = portName;
57             ReadCOM.serialport.BaudRate = baudRate;
58             ReadCOM.serialport.Parity = Parity.None;
59             ReadCOM.serialport.DataBits = dataBits;
60             ReadCOM.serialport.StopBits = StopBits.One;
61             //打开串口
62             ReadCOM.serialport.Open();   
63 
64         }
65          try
66             {
67                // serialport.DataReceived = null;
68                 //if (serialport != null )
69                 //{
70                 //    serialport.Clofse();
71                 //}
72                 //serialport = new SerialPort();
73                 ReadCOM.serialport.DataReceived += DataReceived;
74                 portName = ConfigurationManager.AppSettings["PortName"].ToString();
75                 baudRate = int.Parse(ConfigurationManager.AppSettings["BaudRate"]);
76                 dataBits = int.Parse(ConfigurationManager.AppSettings["DataBits"]);
77                 serialNumber = ConfigurationManager.AppSettings["SerialNumber"].ToString();
78                 SocketPort = int.Parse(ConfigurationManager.AppSettings["SocketPort"]);
79                 this.OpenPort();
80                 //this.GetReaderStatu();
81             }
82             catch (System.Exception ex)
83             {
84                // MessageBox.Show("程序已启动或串口已被占用！");
85                 MessageBox.Show(ex.Message);
86             }

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原文地址：https://www.cnblogs.com/liende/p/3240709.html