Question

C# HttpWebRequest怎样获取到HttpOnly的Cookie

C#使用HttpWebRequest发送Post请求，但无法得到HttpOnly的Cookie，如何才能获取到？

Answer 1

当cookie正确后，用下面这个函数访问一次url

       #region DLL Imports
        [SuppressUnmanagedCodeSecurity, SecurityCritical, DllImport("wininet.dll", EntryPoint = "InternetGetCookieExW", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
        internal static extern bool InternetGetCookieEx([In] string Url, [In] string cookieName, [Out] StringBuilder cookieData, [In, Out] ref uint pchCookieData, uint flags, IntPtr reserved);
        #endregion
        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref int pcchCookieData, int dwFlags, object lpReserved);
        private static string GetCookieString(string url)
        {
            // Determine the size of the cookie     
            int datasize = 256;
            StringBuilder cookieData = new StringBuilder(datasize);
            if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null))
            {
                if (datasize < 0)
                    return null;
                // Allocate stringbuilder large enough to hold the cookie     
                cookieData = new StringBuilder(datasize);
                if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null))
                    return null;
            }
            return cookieData.ToString();
        }

Answer 2

方法如下：
byte[] bytes = Encoding.Default.GetBytes(_post);
CookieContainer myCookieContainer = new CookieContainer();
try
{
//新建一个CookieContainer
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(_loginurl);
//新建一个HttpWebRequest
myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
myHttpWebRequest.AllowAutoRedirect = false;
myHttpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";
myHttpWebRequest.Timeout = 60000;
myHttpWebRequest.KeepAlive = true;
myHttpWebRequest.ContentLength = bytes.Length;
myHttpWebRequest.Method = "POST";
myHttpWebRequest.CookieContainer = myCookieContainer;
//设置HttpWebRequest
Stream myRequestStream = myHttpWebRequest.GetRequestStream();
myRequestStream.Write(bytes, 0, bytes.Length);
myRequestStream.Close();
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
foreach (Cookie ck in myHttpWebResponse.Cookies)
{
myCookieContainer.Add(ck);
}
myHttpWebResponse.Close();
}
catch
{
MessageBox.show("获取COOKIES失败！");
return;
}