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POWP7 - Building an XML Message
 

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  1. POWP7 - Building an XML Message
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    <p>I need to send an XML message to a web service for my WP7 app, but I have no experience doing that. </p> <p>This is the format in which the web service needs me to send the XML: </p> <pre><code>&lt;pfpMessage version='1.5'&gt; &lt;header&gt; &lt;source&gt; &lt;component type="pfsvc" role="master"&gt; &lt;host ip="" hostname="" serverId=""/&gt; &lt;/component&gt; &lt;/source&gt; &lt;/header&gt; &lt;request request-id='1288730909' async='0' response-url='' language='en'&gt; &lt;phoneAppValidateDeviceTokenRequest &gt; &lt;phoneAppContext &gt; &lt;guid&gt;...&lt;/guid&gt; &lt;deviceToken &gt;...&lt;/deviceToken&gt; &lt;version &gt;1.0.0&lt;/version&gt; &lt;/phoneAppContext&gt; &lt;validationResult &gt;yes&lt;/validationResult&gt; &lt;/phoneAppValidateDeviceTokenRequest&gt; &lt;/request&gt; &lt;/pfpMessage&gt; </code></pre> <p>And this is a small section of the code I have written:</p> <pre><code> XDocument doc = new XDocument(); // start message XElement root = doc.Element("pfpMessage"); root.SetAttributeValue("version", 1.5); doc.Add(root); // message header XElement header = doc.Element("header"); root.Add(header); XElement source = doc.Element("source"); header.Add(source); XElement component = doc.Element("component"); component.SetAttributeValue("type", "pfsdk"); source.Add(component); XElement element = doc.Element("host"); element.SetAttributeValue("ip", pfAuthParams.IpAddress); element.SetAttributeValue("hostname", pfAuthParams.Hostname); component.Add(element); </code></pre> <p>Part of the problem is that the SetAttributeValue function keeps throwing an exception even though it looks exactly the same as the MSDN example. </p> <p>Is this the right way to build an XML message that matches the format?</p> <p>EDIT: This causes an InvalidOperationException:</p> <pre><code>XDocument doc = new XDocument( new XElement("pfpMessage", new XAttribute("version", 1.5), new XElement("header", new XElement("source", new XElement("component", new XAttribute("type", "pfsdk"), new XElement("host", new XAttribute("ip", pfAuthParams.IpAddress), new XAttribute("hostname", pfAuthParams.Hostname) ) ) ) ) ), new XElement("request", new XAttribute("request-id", y), new XAttribute("async", 0), new XAttribute("response-url", ""), new XAttribute("language", "en"), new XElement("phoneAppValidateDeviceTokenRequest", new XElement("phoneAppValidateContext"), new XElement("guid", (Application.Current as App).SharedGUID), new XElement("deviceToken", (Application.Current as App).SharedURI) ), new XElement("version", "1.0.0") ) ); </code></pre>
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