C# Code:

/// <summary>
/// IP地址工具类
/// </summary>
public static class IPHelper
{
   /// <summary>
   /// 获取IP地址
   /// </summary>
   /// <param name="request"></param>
   /// <returns></returns>
   public static string GetIPAddress(HttpRequestMessage request)
   {
      string ip = "";
      
      if (request.Properties.ContainsKey("MS_OwinContext"))
      {
         ip = ((OwinContext)request.Properties["MS_OwinContext"]).Request.RemoteIpAddress;
      }
      else if (request.Properties.ContainsKey("MS_HttpContext"))
      {
         ip = ((HttpContextWrapper)request.Properties["MS_HttpContext"]).Request.UserHostAddress;
      }
      else if (request.Properties.ContainsKey(RemoteEndpointMessageProperty.Name))
      {
         ip = ((RemoteEndpointMessageProperty)request.Properties[RemoteEndpointMessageProperty.Name]).Address;
      }
      
      if (ip == "::1") ip = "127.0.0.1";
      
      if (string.IsNullOrEmpty(ip) || !IsIP(ip))
      return "127.0.0.1";
      else
      return ip;
   }
   
   /// <summary>
   /// 获取IP地址
   /// </summary>
   /// <param name="request"></param>
   /// <returns></returns>
   public static string GetIPAddress(HttpRequest request)
   {
      string result = String.Empty;
      
      result = request.ServerVariables["HTTP_CDN_SRC_IP"];
      
      if (string.IsNullOrEmpty(result))
      result = request.ServerVariables["REMOTE_ADDR"];
      
      if (string.IsNullOrEmpty(result))
      result = request.UserHostAddress;
      
      if (string.IsNullOrEmpty(result) || !IsIP(result))
      return "127.0.0.1";
      
      return result;
   }
   
   /// <summary>
   /// 是否IP
   /// </summary>
   /// <param name="ip"></param>
   /// <returns></returns>
   public static bool IsIP(string ip)
   {
      return System.Text.RegularExpressions.Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$");
   }
   
   
}

//来源:C/S框架网(www.csframework.com) QQ:1980854898