public static class CookieReader 
    { 
        /// <summary> 
        /// Enables the retrieval of cookies that are marked as "HTTPOnly".  
        /// Do not use this flag if you expose a scriptable interface,  
        /// because this has security implications. It is imperative that  
        /// you use this flag only if you can guarantee that you will never  
        /// expose the cookie to third-party code by way of an  
        /// extensibility mechanism you provide.  
        /// Version:  Requires Internet Explorer 8.0 or later. 
        /// </summary> 
        private const int INTERNET_COOKIE_HTTPONLY = 0x00002000; 
 
        [DllImport("wininet.dll", SetLastError = true)] 
        private static extern bool InternetGetCookieEx( 
            string url, 
            string cookieName, 
            StringBuilder cookieData, 
            ref int size, 
            int flags, 
            IntPtr pReserved); 
 
        /// <summary> 
        /// Returns cookie contents as a string    *****可用***** 
        /// </summary> 
        /// <param name="url"></param> 
        /// <returns></returns> 
        public static string GetCookie(string url) 
        { 
            int size = 512; 
            StringBuilder sb = new StringBuilder(size); 
            if (!InternetGetCookieEx(url, null, sb, ref size, INTERNET_COOKIE_HTTPONLY, IntPtr.Zero)) 
            { 
                if (size < 0) 
                { 
                    return null; 
                } 
                sb = new StringBuilder(size); 
                if (!InternetGetCookieEx(url, null, sb, ref size, INTERNET_COOKIE_HTTPONLY, IntPtr.Zero)) 
                { 
                    return null; 
                } 
            } 
            return sb.ToString(); 
        } 
 
    }