高分诚心求教！请高手教我如何用WebClient自动填写Post表单并提交

Question

根据网络上的实例，能够做一个简单的但是面对复杂的却一直不能成功        public String GetPostHttp()
        {
            string srcString="chucuo";            // 提交按钮的文本
            string submitButton = "登录";
            // 页面的 VeiwState（可以通过IE打开页面，右键“查看源文件”取得）
            string viewState = "/wEPDwULLTEwMDUyNjYzMjhkZA==";
            // 页面的 EventValidation（可以通过IE打开页面，右键“查看源文件”取得）
            //string eventValidation = "/wEWBAK3xNW/DgKfyLs/Arnisr4CAumSxcAMOcITkYMHoeMuHNAexLkgIUS6ilo=";            submitButton = System.Web.HttpUtility.UrlEncode(submitButton);
            viewState = System.Web.HttpUtility.UrlEncode(viewState);
            //eventValidation = System.Web.HttpUtility.UrlEncode(eventValidation);
            String hc = "北京";
            String dc = "上海";
            String dc2 = "深圳";
            hc = System.Web.HttpUtility.UrlEncode(hc);
            dc = System.Web.HttpUtility.UrlEncode(dc);
            dc2 = System.Web.HttpUtility.UrlEncode(dc2);
            
            try
            {
                // 要提交表单的URI字符串。
                //string uriString = "http://flights.ctrip.com/Domestic/ShowFareFirst.aspx";
                string uriString = "http://flights.ctrip.com/Domestic/ShowFareFirst.aspx";
                // 要提交的字符串数据。格式形如:user=uesr1&password=123
                string postString = "flight_type=M&bunk_grade=Y&FlightWay=M&HomeCity="+ hc +"&DestCity1="+ dc +"&DestCity2="+ dc2 +"&TicketAgency_List="+ hc +"&DDatePeriod1=2008-4-21&startPeriod=All&ADatePeriod1=2008-4-21&startPeriod2=All&ChildType=ADU&airlineChoice=All&DSeatClass=Y&Quantity=1&NOVIEWSTATE=" + viewState;
                // 初始化WebClient
                WebClient webClient = new WebClient();
                webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                // 将字符串转换成字节数组
                byte[] postData = Encoding.Default.GetBytes(postString);
                // 上传数据，返回页面的字节数组
                //byte[] buff = webclient.DownloadData(url);
                //string cookie = webclient.ResponseHeaders.Get("Set-Cookie");
                byte[] responseData = webClient.UploadData(uriString, "POST", postData);
                // 将返回的将字节数组转换成字符串(HTML);
                // ASP.NET 返回的页面一般是Unicode,如果是简体中文应使用 
                // Encoding.GetEncoding("GB2312").GetString(responseData)
                srcString = Encoding.Default.GetString(responseData);
            }
            catch (WebException we)
            {
                string msg = we.Message;
            }
            return srcString;        }
请高手指点下如何能够成功的Post 这个页面http://flights.ctrip.com/Domestic/SearchFlights.aspx

Answer 1

搞这个很麻烦的，需要分析数据
第一步应该请求用Get，HttpRequest类，请求页面
使用HttpResponse类，获取你要post的数据，
第二步，post，同样使用那两个类，
关键是要分析数据post的内容，格式，等

Answer 2

……麻烦也要搞啊……这个步骤我已经会了
POST /Domestic/ShowFareFirst.aspx HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
Referer: http://flights.ctrip.com/Domestic/SearchFlights.aspx
Accept-Language: zh-cn
Content-Type: application/x-www-form-urlencoded
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)
Host: flights.ctrip.com
Content-Length: 298
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: __utma=167964915.382392779.1208746167.1208830385.1208831162.7; __utmz=167964915.1208746167.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); ALLYESID4=00080421104928890347; Customer=HAC=5&HAL=zh%2Dcn; __utmb=167964915.17.10.1208831161968; __utmc=167964915; ASPSESSIONIDCASDASAA=MBFJLPPBKNOIGGOFKNHELIJNNOVIEWSTATE=%2FwEPDwULLTEwMDUyNjYzMjhkZA%3D%3D&flight_type=D&bunk_grade=Y&FlightWay=S&HomeCity=%B1%B1%BE%A9&DestCity1=%C9%CF%BA%A3&DestCity2=&TicketAgency_List=%B1%B1%BE%A9&DDatePeriod1=2008-4-22&startPeriod=All&ADatePeriod1=&startPeriod2=All&ChildType=ADU&airlineChoice=All&DSeatClass=Y&Quantity=1HTTP/1.1 200 OK
Date: Tue, 22 Apr 2008 02:50:12 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
Cache-Control: private
Content-Type: text/html; charset=gb2312
Content-Length: 82505GET /styles/common/private_header_print.css HTTP/1.1
Accept: */*
Referer: http://flights.ctrip.com/Domestic/ShowFareFirst.aspx
Accept-Language: zh-cn
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)
Host: webresource.ctrip.com
Connection: Keep-Alive
Cookie: __utma=167964915.382392779.1208746167.1208830385.1208831162.7; __utmz=167964915.1208746167.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); ALLYESID4=00080421104928890347; Customer=HAC=5&HAL=zh%2Dcn; __utmb=167964915.17.10.1208831161968; __utmc=167964915
或者能不能帮我分析一下这个获取的信息

Answer 3

NOVIEWSTATE=%2FwEPDwULLTEwMDUyNjYzMjhkZA%3D3D
flight_type=D
bunk_grade=Y
FlightWay=S
HomeCity=%B1%B1%BE%A9
DestCity1=%C9%CF%BA%A3
DestCity2=
TicketAgency_List=%B1%B1%BE%A9
DDatePeriod1=2008-4-22
startPeriod=All
ADatePeriod1=
startPeriod2=All
ChildType=ADU
airlineChoice=All
DSeatClass=Y
Quantity=1
这个是需要post的数据，顺序不要乱了 
注意的是，这个有Cookies需要把它也获取然后加进去

Answer 4

cookies的内容应该会自动Post回去吧
难道要自己手动添加到Post数据尾部？
学习一下

Answer 5

即使是这样也不行啊，是不是Cookies的问题没有弄好教我弄一下好不好？还可以加分的

Answer 6

Cookies是在第一次获取网页时获取的
req 是HttpRequest对象
req.CookieContainer = ccc;
此时CCC是一个空的Cookies容器
获取后添加到Cookies容器里，
res.Cookies = ccc.GetCookies(req.RequestUri);
以后就用这个容器就可以了