首先，需要加入一个命名空间

using System.Net.NetworkInformation;

using System.Net.Sockets;

以下是具体代码

        GetPrivateIP();

        string publicIP = GetPublicIP();

        Console.WriteLine("Public IP is: {0}", publicIP);

		//获取公共网络IP地址

        static string GetPublicIP()

        {

            String address = "";

            WebRequest request = WebRequest.Create("http://checkip.dyndns.org/");

            using (WebResponse response = request.GetResponse())

            using (StreamReader stream = new StreamReader(response.GetResponseStream()))

            {

                address = stream.ReadToEnd();

            }

            // 从html页面中查找IP地址

            int first = address.IndexOf("Address: ") + 9;

            int last = address.LastIndexOf("</body>");

            address = address.Substring(first, last - first);

            return address;

        }

		//获取私有IP地址

		static void GetPrivateIP()

        {

            foreach (var interfaces in NetworkInterface.GetAllNetworkInterfaces())

            {

                foreach (var address in interfaces.GetIPProperties().UnicastAddresses)

                {

                    if (address.Address.AddressFamily == AddressFamily.InterNetwork)

                    {

                        Console.WriteLine("IP Address:  " + address.Address.ToString());

                    }

                }

            }

        }