webBrowser1.Document.Cookie取不到HttpOnly的Cookie，取Cookie不完整

 在做数据采集时，有些网站需要输入验证码，但各网站验证码都不同，不可能有完美的识别验证码的代码，所以我也没去研究，我所采取的方案是：在winform里通过WebBrowser调用网页先手动登录系统，然后再通过webBrowser1.Document.Cookie获取其Cookie，再将其用到HttpWebRequest里用来访问自己需要的页。

一直用的都没有问题，但最近在对一个网站操作时总是不能获取完整Cookie，百思不得其解，使用Fiddler2对比发现，不能获取到的Cookie里最后有一个HttpOnly的标识，顺藤摸瓜发现原来webBrowser1.Document.Cookie里是取不到HttpOnly的Cookie的，也找到解决方法：

using System;   using System.ComponentModel;   using System.Net;   using System.Runtime.InteropServices;   using System.Security;   using System.Security.Permissions;   using System.Text;       internal sealed class NativeMethods   {      #region enums         public enum ErrorFlags       {           ERROR_INSUFFICIENT_BUFFER = 122,           ERROR_INVALID_PARAMETER = 87,           ERROR_NO_MORE_ITEMS = 259       }         public enum InternetFlags       {           INTERNET_COOKIE_HTTPONLY = 8192, //Requires IE 8 or higher           INTERNET_COOKIE_THIRD_PARTY = 131072,           INTERNET_FLAG_RESTRICTED_ZONE = 16       }       #endregion       #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   }       /// <SUMMARY></SUMMARY>   /// 取得WebBrowser的完整Cookie。   /// 因为默认的webBrowser1.Document.Cookie取不到HttpOnly的Cookie   ///    public class FullWebBrowserCookie   {         [SecurityCritical]       public static string GetCookieInternal(Uri uri, bool throwIfNoCookie)       {           uint pchCookieData = 0;           string url = UriToString(uri);           uint flag = (uint)NativeMethods.InternetFlags.INTERNET_COOKIE_HTTPONLY;             //Gets the size of the string builder           if (NativeMethods.InternetGetCookieEx(url, null, null, ref pchCookieData, flag, IntPtr.Zero))           {               pchCookieData++;               StringBuilder cookieData = new StringBuilder((int)pchCookieData);                 //Read the cookie               if (NativeMethods.InternetGetCookieEx(url, null, cookieData, ref pchCookieData, flag, IntPtr.Zero))               {                   DemandWebPermission(uri);                   return cookieData.ToString();               }           }             int lastErrorCode = Marshal.GetLastWin32Error();             if (throwIfNoCookie || (lastErrorCode != (int)NativeMethods.ErrorFlags.ERROR_NO_MORE_ITEMS))           {               throw new Win32Exception(lastErrorCode);           }             return null;       }         private static void DemandWebPermission(Uri uri)       {           string uriString = UriToString(uri);             if (uri.IsFile)           {               string localPath = uri.LocalPath;               new FileIOPermission(FileIOPermissionAccess.Read, localPath).Demand();           }           else          {               new WebPermission(NetworkAccess.Connect, uriString).Demand();           }       }         private static string UriToString(Uri uri)       {           if (uri == null)           {               throw new ArgumentNullException("uri");           }             UriComponents components = (uri.IsAbsoluteUri ? UriComponents.AbsoluteUri : UriComponents.SerializationInfoString);           return new StringBuilder(uri.GetComponents(components, UriFormat.SafeUnescaped), 2083).ToString();       }   }   

 可能有用的资料：

Retrieve HttpOnly Session Cookie in WebBrowser

C#下利用WebBrowser完整获取COOKIE