Question

我创建了GetCourses()方法，我使用HttpWebRequest从显示的Url请求数据。如果我在浏览器中复制粘贴网址，浏览器将显示xml数据。我也用fiddler来做一些请求。在提琴手上，它说数据是编码的，我必须解码它。所以，我点击了解码，我可以看到XML。但是，使用下面的代码我得到Content-Length = -1。

public static void GetCourses()
    {
        try
        {
            HttpWebRequest requestForItCourse =
               (HttpWebRequest)WebRequest.Create("http://www.mnsu.edu/schedule/direct.php?action=courses&term=20135&subject=it");
            requestForItCourse.AutomaticDecompression = DecompressionMethods.GZip|DecompressionMethods.Deflate;
            HttpWebResponse responseFromMnsuDirectPhp =
                (HttpWebResponse)requestForItCourse.GetResponse();

            Stream dataStream = responseFromMnsuDirectPhp.GetResponseStream();
            responseFromMnsuDirectPhp.Close();
//Parse and insert courses into the database
        }
        catch (Exception ex)
        {

        }
    }

Answer 1

您需要在关闭响应之前阅读响应流。

试试这个：

HttpWebRequest requestForItCourse = (HttpWebRequest)WebRequest.Create("http://www.mnsu.edu/schedule/direct.php?action=courses&term=20135&subject=it");
requestForItCourse.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
HttpWebResponse responseFromMnsuDirectPhp = (HttpWebResponse)requestForItCourse.GetResponse();

StreamReader dataStream = new StreamReader(responseFromMnsuDirectPhp.GetResponseStream());
string data = dataStream.ReadToEnd();

responseFromMnsuDirectPhp.Close();
dataStream.Close();

Answer 2

当我运行它时，这很有用。您需要在关闭之前阅读流。作为旁注，许多人更喜欢使用using关键字自动关闭其Streams。

try
{
    HttpWebRequest requestForItCourse = (HttpWebRequest)WebRequest.Create("http://www.mnsu.edu/schedule/direct.php?action=courses&term=20135&subject=it");
    requestForItCourse.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
    HttpWebResponse responseFromMnsuDirectPhp =
                (HttpWebResponse)requestForItCourse.GetResponse();

    string raw_xml;
    using(var sr = new StreamReader(responseFromMnsuDirectPhp.GetResponseStream()))
    {
        raw_xml = sr.ReadToEnd();
    }

    //Parse and insert courses into the database
}
catch (Exception ex)
{

}

httpwebrequest getresponse（）不返回任何内容，而fiddler显示内容

2 个答案: