wininet.dll函数库：不会过期的cookie

using System;
using System.Text;
using System.Runtime.InteropServices;
namespace seaven
{
    class Program
    {
        /// <summary>
        /// 设置cookie
        /// </summary>
        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData);
        /// <summary>
        /// 获取cookie
        /// </summary>
        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool InternetGetCookie(
        string url, string name, StringBuilder data, ref int dataSize);
        static void Main(string[] args)
        {
            //获取旧的
            StringBuilder cookie = new StringBuilder(new String(' ', 2048));
            int datasize = cookie.Length;
            bool b = InternetGetCookie("http://www.seaven.org", null, cookie, ref datasize);
            //删除旧的
            foreach (string fileName in System.IO.Directory.GetFiles(System.Environment.GetFolderPath(Environment.SpecialFolder.Cookies)))
            {
                if (fileName.ToLower().IndexOf("seaven") > 0)
                {
                    System.IO.File.Delete("seaven");
                }
            }
            //生成新的
            foreach (string c in cookie.ToString().Split(';'))
            {
                string[] item = c.Split('=');
                string name = item[0];
                string value = item[1] + ";expires=Sun,22-Feb-2099 00:00:00 GMT";
                InternetSetCookie("http://www.seaven.org", name, value);
                InternetSetCookie("http://www.seaven.org", name, value);
                InternetSetCookie("http://www.seaven.org", name, value);
            }
        }
    }
}