Javascript T请尝试为您的请求设置用户代理。该用户代理没有成功。如果您查看我上面的代码，您知道postData字符串看起来是否正确吗？我还发布了Fiddler2输出，我只是将每个具有值的输出添加到postData字符串中。 __EVENTTARGET ctl00$Co

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T请尝试为您的请求设置用户代理。该用户代理没有成功。如果您查看我上面的代码，您知道postData字符串看起来是否正确吗？我还发布了Fiddler2输出，我只是将每个具有值的输出添加到postData字符串中。

__EVENTTARGET ctl00$ContentPlaceHolder1$GenericWebUserControl$ShowAllCheckBox
__EVENTARGUMENT
__LASTFOCUS
__VIEWSTATE (REMOVED DUE TO LENGTH)
__EVENTVALIDATION (REMOVED DUE TO LENGTH)
ctl00$ContentPlaceHolder1$GenericWebUserControl$Organization0 ALL
ctl00$ContentPlaceHolder1$GenericWebUserControl$Initial or Amendment1 ALL
ctl00$ContentPlaceHolder1$GenericWebUserControl$Relief Requested2 ALL
ctl00$ContentPlaceHolder1$GenericWebUserControl$Country3 ALL
ctl00$ContentPlaceHolder1$GenericWebUserControl$Status4 ALL
ctl00$ContentPlaceHolder1$GenericWebUserControl$StartDate5  
ctl00$ContentPlaceHolder1$GenericWebUserControl$EndDate5    
ctl00$ContentPlaceHolder1$GenericWebUserControl$ShowAllCheckBox on

private void CreateRequest()
{
    HttpWebRequest httpWebRequest;
    HttpWebResponse httpWebResponse;
    StreamWriter streamWriter;
    Stream webResponseStream;
    StreamReader streamReader;
    string postData;
    string outputHTML;

    postData = String.Format("&__EVENTTARGET={0}" + "&__VIEWSTATE={1}" + "&__EVENTVALIDATION=(2)"+"&ctl00$ContentPlaceHolder1$GenericWebUserControl$ShowAllCheckBox=on" +"&ctl00$ContentPlaceHolder1$GenericWebUserControl$Organization0=ALL" +"&ctl00$ContentPlaceHolder1$GenericWebUserControl$Initial+or+Amendment1=ALL" +"&ctl00$ContentPlaceHolder1$GenericWebUserControl$Relief+Requested2=ALL" +"&ctl00$ContentPlaceHolder1$GenericWebUserControl$Country3=ALL" +"&ctl00$ContentPlaceHolder1$GenericWebUserControl$Status4=ALL",EVENTTARGET, VIEWSTATE, EVENTVALIDATION);

    httpWebRequest = (HttpWebRequest)WebRequest.Create("http://services.cftc.gov/sirt/sirt.aspx?Topic=ForeignPart30Exemptions");
    httpWebRequest.Method = "POST";
    httpWebRequest.ContentType = "application/x-www-form-urlencoded";
    httpWebRequest.ContentLength = postData.Length;

    streamWriter = new StreamWriter(httpWebRequest.GetRequestStream(), System.Text.Encoding.ASCII);
    streamWriter.Write(postData);
    streamWriter.Close();

    httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();

    webResponseStream = httpWebResponse.GetResponseStream();
    streamReader = new StreamReader(webResponseStream);
    outputHTML = streamReader.ReadToEnd();

    Console.WriteLine(outputHTML);
}

__EVENTTARGET: ctl00$ContentPlaceHolder1$GenericWebUserControl$ShowAllCheckBox