如何从Web响应中读取XML？

Question

I am trying to read xml from web response and get selected nodes (ie link) from it. This is what I have so far and its showing "System.Xml.XmlElement" , as an output.

WRequest method, sends a POST request to url using web request and returns a string xml response such as:

<status> <code>201</code>
<resources_created>
<link href="####" rel="############" title="####" /> 
</resources_created> 
<warnings> <warning>display_date is read-only</warning> </warnings> 
</status>

ReadUri2 method

public static string readUri2()
    {
        string uri = "";
        string xml = WRequest();

        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.LoadXml(xml);

        XmlNode elem = xmlDoc.DocumentElement.FirstChild;
        uri = elem.ToString();
        return uri;

        }

PageLoad calls

 protected void Page_Load(object sender, EventArgs e)
    {
        string uri = readUri2();
        Label1.Text = Server.HtmlEncode(uri);

    }

Any help would be very much appreciated. Many thanks.

Answer 1

The immediate problem (the reason you're seeing System.Xml.XmlElement ) is that you're calling ToString on an XmlElement , which doesn't override that method. You probably want to use the InnerXml or OuterXml properties instead:

XmlNode elem = xmlDoc.DocumentElement.FirstChild;
return elem.OuterXml;

That's returning the whole of the XML of the first child, which is code . Next you'll want to change which element you're looking for, and get the right attributes.

As a side note, I'd strongly recommend using LINQ to XML instead - it's a generally nicer XML API. For example:

// TODO: Rename the `WRequest` method; that's horrible.
var document = XDocument.Parse(WRequest());
var href = document.Descendants("link").Single().Attribute("href").Value;