获取真ip

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1.       /// <summary>  
2.         /// 获取真ip  
3.         /// </summary>  
4.         /// <returns></returns>  
5.         public string GetRealIP()  
6.         {  
7.             string result = String.Empty;  
8.   
9.   
10.             // result = System.Web.HttpContext.Current.Request.ServerVariables["RemoteIp"];  
11.             result = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];  
12.             //可能有代理   
13.             if (!string.IsNullOrWhiteSpace(result))  
14.             {  
15.                 //没有"." 肯定是非IP格式  
16.                 if (result.IndexOf(".") == -1)  
17.                 {  
18.                     result = null;  
19.                 }  
20.                 else  
21.                 {  
22.                     //有","，估计多个代理。取第一个不是内网的IP。  
23.                     if (result.IndexOf(",") != -1)  
24.                     {  
25.                         result = result.Replace(" ", string.Empty).Replace("\"", string.Empty);  
26.                         string[] temparyip = result.Split(",;".ToCharArray());  
27.                         if (temparyip != null && temparyip.Length > 0)  
28.                         {  
29.                             for (int i = 0; i < temparyip.Length; i++)  
30.                             {  
31.                                 //找到不是内网的地址  
32.                                 if (IsIPAddress(temparyip[i]) && temparyip[i].Substring(0, 3) != "10." && temparyip[i].Substring(0, 7) != "192.168" && temparyip[i].Substring(0, 7) != "172.16.")  
33.                                 {  
34.                                     return temparyip[i];  
35.                                 }  
36.                             }  
37.                         }  
38.                     }  
39.                     //代理即是IP格式  
40.                     else if (IsIPAddress(result))  
41.                     {  
42.                         return result;  
43.                     }  
44.                     //代理中的内容非IP  
45.                     else  
46.                     {  
47.                         result = null;  
48.                     }  
49.                 }  
50.             }  
51.             if (string.IsNullOrWhiteSpace(result))  
52.             {  
53.                 result = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];  
54.             }  
55.             if (string.IsNullOrWhiteSpace(result))  
56.             {  
57.                 result = System.Web.HttpContext.Current.Request.UserHostAddress;  
58.             }  
59.             return result;  
60.         }  
61.         public bool IsIPAddress(string str)  
62.         {  
63.             if (string.IsNullOrWhiteSpace(str) || str.Length < 7 || str.Length > 15)  
64.                 return false;  
65.   
66.   
67.             string regformat = @"^\d{1,3}[\.]\d{1,3}[\.]\d{1,3}[\.]\d{1,3}";  
68.             //var match = Regex.Match(str, @"^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})");  
69.             Regex regex = new Regex(regformat, RegexOptions.IgnoreCase);  
70.   
71.   
72.             return regex.IsMatch(str);  
73.         } 

获取真ip

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原文地址：http://www.cnblogs.com/panjiayuan/p/5415559.html