visual studio 生成類別圖

 引入參考System.Management

再使用using System.Management;

  ManagementObjectSearcher query = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection queryMAC = query.Get();
            foreach (ManagementObject mac in queryMAC)
            {
                if (mac["IPEnabled"].ToString() == "True")
                    Console.WriteLine(mac["MacAddress"].ToString());
            }