发布后未获得预期的响应数据

Question

早些时候我在发布数据和获取响应时遇到问题，我终于能够发布数据，但响应没有给我正确的结果，我浏览了网络表单，然后运行了我的代码使用 Visual Studio 并使用 Fiddler 比较了网络表单，并且从我所看到的内容中正确填充了它。 然后我通过网站和视觉工作室比较了这两个结果并比较了它们，我没有得到我应该得到的结果，我不知道为什么，并且在过去的几个小时里一直在努力弄清楚我是什么做错了（之前确实发布了一个问题，并且对我想要做的事情有一些指导，所以如果你早些时候看到这样的事情，那么所有的道歉，我不得不说得更清楚）

这是我写的代码

 public static string PostMyData()
    {
        // This is where the data is going to be posted
        string url = @"http://www.cpso.on.ca/Public-Register/All-Doctors-Search.aspx";

        // This is the data that i am going to post
        string postData = "manScript_HiddenField=&" +
            "__EVENTTARGET=p%24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24btnSubmit&" +
            "__EVENTARGUMENT=&__LASTFOCUS=&lng=en-CA&p%24lt%24ctl00%24SearchBox%24txtWord=Site+Search&p%" + 
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24txtLastName=Aalders&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24txtFirstName=&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24grpGender=+&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24ddLanguage=08&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24grpDocType=rdoDocTypeAll&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24grpStatus=rdoStatusActive&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24ddCity=Select --%3E&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24txtPostalCode=&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24ddHospitalCity=Select+--%3E&p%" +
            "24lt%24ctl03%24pageplaceholder%24p%24lt%24ctl03%24AllDoctorsSearch%24ddHospitalName=-1&" +
            "__VIEWSTATE=";

        // Create my request
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.ContentLength = postData.Length;
        req.Referer = @"http://www.cpso.on.ca/Public-Register/All-Doctors-Search.aspx";
        req.Accept = "text/html, application/xhtml+xml, */*";
        req.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko";

        // Now its time to write the data that I want to post to the webpage
        using (StreamWriter reqWriter = new StreamWriter(req.GetRequestStream()))
        {
            reqWriter.Write(postData);
        }

        // Get the response/results

        string respData = string.Empty;

        using (StreamReader responseReader = new StreamReader(req.GetResponse().GetResponseStream()))
        {
            // Add response/results to string
            respData = responseReader.ReadToEnd();
        }

        return respData;

    }

我在返回的 respData 处设置了一个断点，它应该显示一条记录，但它没有显示。

这是图片，其中一张是 Fiddler 中显示的网络表单，来自实际的网络表单..

这是我通过 Visual Studio 运行它时的那个，这让我相信我正确地发布了它，因为它是一样的

Answer 1

看起来表单发布到/Public-Register/All-Doctors-Search.aspx，但浏览器被重定向到/Public-Register-Info-(1)/Doctor-Search-Results 以显示结果。他们似乎正在使用 ASP.NET 会话来维护两个页面之间的状态。由于会话依赖于 cookie，因此您必须在 HttpWebRequest 上启用 cookie，方法是创建一个 CookieContainer...

// Create my request
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.CookieContainer = new CookieContainer();

现在它应该可以工作了：Live Demo