如何找到可用的COM端口？

正如其他人所建议的，您可以使用WMI。您可以在CodeProject中找到一个示例

try{    ManagementObjectSearcher searcher =        new ManagementObjectSearcher("root\WMI",        "SELECt * FROM MSSerial_PortName");    foreach (ManagementObject queryObj in searcher.Get())    {        Console.WriteLine("-----------------------------------");        Console.WriteLine("MSSerial_PortName instance");        Console.WriteLine("-----------------------------------");        Console.WriteLine("InstanceName: {0}", queryObj["InstanceName"]);        Console.WriteLine("-----------------------------------");        Console.WriteLine("MSSerial_PortName instance");        Console.WriteLine("-----------------------------------");        Console.WriteLine("PortName: {0}", queryObj["PortName"]);        //If the serial port's instance name contains USB         //it must be a USB to serial device        if (queryObj["InstanceName"].ToString().Contains("USB"))        { Console.WriteLine(queryObj["PortName"] + "  is a USB to SERIAL adapter/converter");        }    }}catch (ManagementException e){    Console.WriteLine("An error occurred while querying for WMI data: " + e.Message);} 

framework v1.1 AFAIK不允许您执行此操作。

在2.0中有一个静态函数

SerialPort.GetPortNames()