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"))

{