[ASP.NET]使用 request取得Client IP(Client IP using the request made)

問題

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使用 request取得Client IP



解決方法

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於WebService or WebSite or ASP.NET Application:

using MyWebToolkit;
string ip=MyWebToolkit.GetClientIP(this.Context);

.cs:

using System;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace MyWebToolkit
{
    public static class MyWebToolkit
    {
        public static string GetClientIP(System.Web.HttpContext context)
        {
            string ip = null;
            if (string.IsNullOrEmpty(context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"])
                || Convert.ToString(context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]).Contains("UNKNOWN"))
            {
                ip = context.Request.ServerVariables["REMOTE_ADDR"];
            }
            else if (context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(",") > 0)
            { ip = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(1, context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(",") - 1); }
            else if (context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";") > 0)
            { ip = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(1, context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";") - 1); }
            else { ip = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; }
            return ip.Replace(" ", string.Empty);
        }
    }
}