C# 取得内网IP、外网IP、客户端IP方法
前言
在 Windows Form Application 里对于取得 IP Address 有内网、外网两种 IP Address ,如果只需要取得内网 IP Address ,可以透过使用 IPHostEntry 类别取得,而外网的话就必须要发送一个 Request 到一个可以取得 IP Address 的网站后再分析 Response 的内容,这个网站可以自己做或者使用现成的,如 http://www.whatismyip.com.tw/ 。
另外,在使用 Socket 通讯的情况下,也有可能有需要知道前来连结的客户端的 IP Address 是什么,这时就可以使用 Socket.RemoteEndPoint 属性来取得远程 IP 地址和通讯端口编号,以下就列出范例代码看看该如何使用。
范例程序代码
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/// <summary> /// 取得外网 IP Address /// </summary> /// <returns></returns> private string GetExtranetIPAddress() { HttpWebRequest request = HttpWebRequest.Create("http://www.whatismyip.com.tw") as HttpWebRequest; request.Method = "GET"; request.ContentType = "application/x-www-form-urlencoded"; request.UserAgent = "Mozilla/5.0"; string ip = string.Empty; WebResponse response = request.GetResponse(); using (StreamReader reader = new StreamReader(response.GetResponseStream())) { string result = reader.ReadToEnd(); string pattern = @"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}"; ip = Regex.Match(result, pattern).ToString(); } return ip; // result: 210.125.21.xxx }
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/// <summary> /// 取得本机 IP Address /// </summary> /// <returns></returns> private List<string> GetHostIPAddress() { List<string> lstIPAddress = new List<string>(); IPHostEntry IpEntry = Dns.GetHostEntry(Dns.GetHostName()); foreach (IPAddress ipa in IpEntry.AddressList) { if (ipa.AddressFamily == AddressFamily.InterNetwork) lstIPAddress.Add(ipa.ToString()); } return lstIPAddress; // result: 192.168.1.17 ...... }
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private static string GetIP() { string tempip = ""; try { WebRequest wr = WebRequest.Create("http://www.ip138.com/ips138.asp"); Stream s = wr.GetResponse().GetResponseStream(); StreamReader sr = new StreamReader(s, Encoding.Default); string all = sr.ReadToEnd(); //读取网站的数据 int start = all.IndexOf("您的IP地址是:[") + 9; int end = all.IndexOf("]", start); tempip = all.Substring(start, end - start); sr.Close(); s.Close(); } catch { } return tempip; }
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/// <summary> /// 执行服务器监听 /// </summary> public static void RunServer() { // 建立X509凭证 ServerCertificate = new X509Certificate(Certificate, "ssl"); // 监听任何IP Address来的讯息 listener = new TcpListener(System.Net.IPAddress.Any, 17170); // 开启监听 listener.Start(); while (IsRun) { TcpClient client = listener.AcceptTcpClient(); ProcessClient(client); } } /// <summary> /// 接收客户端讯息处理并回复 /// </summary> /// <param name="pClient"></param> private static void ProcessClient(TcpClient pClient) { SslStream sslStream = new SslStream(pClient.GetStream(), true); // 取得连接者 IP 与 Port IPEndPoint point = pClient.Client.RemoteEndPoint as IPEndPoint; string ip = point.Address.ToString(); // result: 127.0.0.1 string port = point.Port.ToString(); // result: 55236 // do something... }
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string tempIP =string.Empty;if (System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList.Length >1) tempIP = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList[1].ToString();