C#中使用serialport类枚举串口，并验证串口是否被占用

使用System.IO.Ports.SerialPort.GetPortNames()枚举可用串口并验证是否被占用，空闲串口添加到comobox1控件中显示。代码如下：

验证可用串口
1 public bool IsPortOpen()
2         {
3             //create vars for testing
4              bool _available = false;
5             SerialPort _tempPort;
6             String[] Portname = SerialPort.GetPortNames();
7 
8             //create a loop for each string in SerialPort.GetPortNames
9              foreach (string str in Portname)
10             {
11                 try
12                 {
13                     _tempPort = new SerialPort(str);
14                     _tempPort.Open();
15
16                     //if the port exist and we can open it
17                     if (_tempPort.IsOpen)
18                     {
19                         comboBox1.Items.Add(str);
20                         _tempPort.Close();
21                         _available = true;
22                     }23                 }
24
25                 //else we have no ports or can't open them display the
26                 //precise error of why we either don't have ports or can't open them
27                 catch (Exception ex)
28                 {
29                     MessageBox.Show(ex.ToString(), "Error - No Ports available", MessageBoxButtons.OK, MessageBoxIcon.Error);
30                     _available = false;
31                 }
32             }
33
34             //return the temp bool
35             return _available;
36         }