C# 擷取 IPv4地址

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網上搜羅了的代碼 做了下改進。 B/S C/S 都能用。

 1 private static string GetIP4Address() 2         { 3             string IP4Address = String.Empty; 4  5             if (HttpContext.Current != null) 6             { 7                 foreach (IPAddress IPA in Dns.GetHostAddresses(HttpContext.Current.Request.UserHostAddress)) 8                 { 9                     if (IPA.AddressFamily.ToString() == "InterNetwork")10                     {11                         IP4Address = IPA.ToString();12                         break;13                     }14                 }15             }16 17             if (IP4Address != String.Empty)18             {19                 return IP4Address;20             }21 22             foreach (IPAddress IPA in Dns.GetHostAddresses(Dns.GetHostName()))23             {24                 if (IPA.AddressFamily.ToString() == "InterNetwork")25                 {26                     IP4Address = IPA.ToString();27                     break;28                 }29             }30 31             return IP4Address;32         }