C# 获取 IPv4地址

 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         }