c#获取使用串口信息
获取串口号有多种方法，下面是几种不同的实现方法：
方法一：使用System.IO.Ports命名空间中的SerialPort类
using System.IO.Ports;
string[] portNames = SerialPort.GetPortNames();
foreach (string portName in portNames)
{
Console.WriteLine(portName);
}
方法二：使用WMI查询串口设备
using System.Management;
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE ConfigManagerErrorCode = 0");
foreach (ManagementObject obj in searcher.Get())
{
string description = obj.GetPropertyValue("Description") as string;
if (description.Contains("COM"))
{