CookieContainer读取和保存

        public void WriteCookiesToDisk(string file, CookieContainer cookieJar)
        {
            using (Stream stream = File.Create(file))
            {
                try
                {
                    Console.Out.Write("Writing cookies to disk... ");
                    BinaryFormatter formatter = new BinaryFormatter();
                    formatter.Serialize(stream, cookieJar);
                    Console.Out.WriteLine("Done.");
                }
                catch (Exception e)
                {
                    Console.Out.WriteLine("Problem writing cookies to disk: " + e.GetType());
                }
            }
        }

        public CookieContainer ReadCookiesFromDisk(string file)
        {
            try
            {
                using (Stream stream = File.Open(file, FileMode.Open))
                {
                    Console.Out.Write("Reading cookies from disk... ");
                    BinaryFormatter formatter = new BinaryFormatter();
                    Console.Out.WriteLine("Done.");
                    return (CookieContainer)formatter.Deserialize(stream);
                }
            }
            catch (Exception e)
            {
                Console.Out.WriteLine("Problem reading cookies from disk: " + e.GetType());
                return new CookieContainer();
            }
        }