http://blog.csdn.net/aasmfox/article/details/8700588

WebBrowser 其实是对 ActiveX 控件 SHDocVw 的封装，而这个SHDocVw的很多底层调用WebBrowser控件并没有提供实现，你这个应用需要直接操作 SHDoceVw 控件才可以。操作方法如下：

1、在 windows/system32 目录下找到 shdocvw.dll 这个动态库，将其添加到引用中

2、在 Form1_Load 中添加如下语句

            SHDocVw.WebBrowser wb = (SHDocVw.WebBrowser)webBrowser1.ActiveXInstance;
            wb.BeforeNavigate2 += new DWebBrowserEvents2_BeforeNavigate2EventHandler(WebBrowser_BeforeNavigate2);
3、添加如下成员函数

private void WebBrowser_BeforeNavigate2(object pDisp, ref object URL, ref object Flags, 
ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel)
{
string postDataText = System.Text.Encoding.ASCII.GetString(PostData as byte[]);
}

完成上述3步后，你post 数据时， 就会响应 BeforeNavigate2 事件，

postDataText 中就是你post的数据。

 

1.在WebBrowser中获取Cookie

CookieContainer myCookieContainer = new CookieContainer();

string cookieStr = webBrowser1.Document.Cookie;
 string[] cookstr = cookieStr.Split(';');
 foreach (string str in cookstr)
 {
     string[] cookieNameValue = str.Split('=');
     Cookie ck = new Cookie(cookieNameValue[0].Trim ().ToString(), cookieNameValue[1].Trim ().ToString());
     ck.Domain = "www.google.com ";
     myCookieContainer.Add(ck);
 }

WebClient设置cookie!
 WebClient wc = new WebClient();
 wc.Headers.Add("Cookie", "PHPSESSID=" + cookie + ";");
 // 注意，这里是Cookie，不是Set-Cookie
 byte[] re = wc.UploadData(Global.RootPath + "test.php", new byte[0]);
 System.Text.UTF8Encoding converter = new System.Text.UTF8Encoding();
 string str = converter.GetString(re);


 2. 在WebBrowser中设置Cookie
 public partial class WebBrowserControl : Form
 {
         private String url;

        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
         public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData);

        public WebBrowserControl(String path)
         {
             this.url = path;
             InitializeComponent();

            // set cookie
             InternetSetCookie(url, "JSESSIONID", Globals.ThisDocument.sessionID);

            // navigate
             webBrowser.Navigate(url);
         }        
 }

3.将WebBrowser的cookie信息传给HttpWebRequest
(我试了，很管用) 
 
先建一个"CookieContainer" 把WebBrowser中的Cookie保存在里面

//在WebBrowser中登录cookie保存在WebBrowser.Document.Cookie中     
CookieContainer myCookieContainer = new CookieContainer();

//String 的Cookie　要转成　Cookie型的　并放入CookieContainer中
string cookieStr = webBrowser1.Document.Cookie;
 string[] cookstr = cookieStr.Split(';');

foreach (string str in cookstr)
 {
     string[] cookieNameValue = str.Split('=');
     Cookie ck = new Cookie(cookieNameValue[0].Trim().ToString(), cookieNameValue[1].Trim().ToString());
     ck.Domain = "www.abc.com";// 必须写对
    myCookieContainer.Add(ck);
 }

HttpWebRequest hreq = (HttpWebRequest)HttpWebRequest.Create("http://www.abc.com/search.asp ");
 hreq.Method = "POST";
 hreq.ContentType = "application/x-www-form-urlencoded";
          
 //自己创建的CookieContainer
 hreq.CookieContainer = myCookieContainer;
          
 string postdata = "id=2005&action=search&name=";
 byte[] byte1 = Encoding.ASCII.GetBytes(postdata);
 hreq.ContentLength = byte1.Length;
           
 Stream poststream = hreq.GetRequestStream();
 poststream.Write(byte1, 0, byte1.Length);
 poststream.Close();
       
 HttpWebResponse hres = (HttpWebResponse)hreq.GetResponse();