我从一个网络服务器的响应使用的StreamReader ......现在我要分析此响应（它是一个XML文档文件）来获得它的值，但每次我尝试这样做，我得到一个错误：根元素是缺少。

如果我直接读取同一个XML文件，该文件是格式正确，我可以读取它。

这是流：

  WebResponse的响应= webRequest.GetResponse（）;
流responseStream = response.GetResponseStream（）;
StreamReader的responseReader =新的StreamReader（responseStream）;
字符串responseString = responseReader.ReadToEnd（）;
 

这是我尝试读取XML文件：

 的XmlDocument xmlDoc中=新的XmlDocument（）;
xmlDoc.Load（responseReader）;
XmlNodeList中地址= xmlDoc.GetElementsByTagName（原始）;
 

解决方案

您已经叫 ReadToEnd（），因此占用了所有的数据（转换成字符串）。这意味着读者有什么更多的付出。只是：不这样做。或者说，做到这一点，使用的loadXML（reaponseString）。

I get a response from a web-server using StreamReader... now I want to parse this response (it's an XML document file) to get its values, but every time I try to do it I get a error: Root element is missing.

If I read the same XML file directly, the file is well formatted and I can read it.

This is the stream:

WebResponse response = webRequest.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader responseReader = new StreamReader(responseStream);
string responseString = responseReader.ReadToEnd();

And this is how I try to read the XML file:

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(responseReader);
XmlNodeList address = xmlDoc.GetElementsByTagName("original");

You have called ReadToEnd(), hence consumed all the data (into a string). This means the reader has nothing more to give. Just: don't do that. Or, do that and use LoadXml(reaponseString).