这个C#类用于获取用户的访问ip地址,这个C#类可以获取通过代理服务器访问的用户的真实ip地址,同时判断ip地址的正确性,如果ip地址格式错误,将会返回1.1.1.1
namespace DotNet.Utilities { /// <summary> /// 共用工具类 /// </summary> public static class IpHelper { #region 获得用户IP /// <summary> /// 获得用户IP /// </summary> public static string GetUserIp() { string ip; string[] temp; bool isErr = false; if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"] == null) ip = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString(); else ip = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"].ToString(); if (ip.Length > 15) isErr = true; else { temp = ip.Split('.'); if (temp.Length == 4) { for (int i = 0; i < temp.Length; i++) { if (temp[i].Length > 3) isErr = true; } } else isErr = true; } if (isErr) return "1.1.1.1"; else return ip; } #endregion } }