C# 取得IP方式

 

/// <summary> /// 取得本機 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 ...... }

/// <summary> /// 取得外網 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 }

/// <summary> /// 執行服務器監聽 /// </summary> public static void RunServer() { // 建立X509憑證 ServerCertificate = new X509Certificate(Certificate, "ssl"); // 監聽任何IP Address來的訊息 listener = new TcpListener(System.Net.IPAddress.Any, 17170); // 開啟監聽 listener.Start(); while (IsRun) { TcpClient client = listener.AcceptTcpClient(); ProcessClient(client); } }

/// <summary> /// 接收客戶端訊息處理並回覆 /// </summary> /// <param name="pClient"></param> private static void ProcessClient(TcpClient pClient) { SslStream sslStream = new SslStream(pClient.GetStream(), true); // 取得連接者 IP 與 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... }

ref web: https://dotblogs.com.tw/joysdw12/2013/07/17/winform-get-ip-address