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PORss20FeedFormatter Ignores TextSyndicationContent type for SyndicationItem.Summary
 

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    <p>While using the Rss20FeedFormatter class in a WCF project, I was trying to wrap the content of my description elements with a <code>&lt;![CDATA[ ]]&gt;</code> section. I found that no matter what I did, the HTML content of the description elements was always encoded and the CDATA section was never added. After peering into the source code of Rss20FeedFormatter, I found that when building the Summary node, it basically creates a new TextSyndicationContent instance which wipes out whatever settings were previously specified (<em>I think</em>).</p> <p><strong>My Code</strong></p> <pre><code>public class CDataSyndicationContent : TextSyndicationContent { public CDataSyndicationContent(TextSyndicationContent content) : base(content) { } protected override void WriteContentsTo(System.Xml.XmlWriter writer) { writer.WriteCData(Text); } } </code></pre> <p><em>... (The following code should wrap the Summary with a CDATA section)</em></p> <pre><code>SyndicationItem item = new SyndicationItem(); item.Title = new TextSyndicationContent(name); item.Summary = new CDataSyndicationContent( new TextSyndicationContent( "&lt;div&gt;This is a test&lt;/div&gt;", TextSyndicationContentKind.Html)); </code></pre> <p><strong>Rss20FeedFormatter Code</strong> <em>(AFAIK, the above code does not work because of this logic)</em></p> <pre><code>... else if (reader.IsStartElement("description", "")) result.Summary = new TextSyndicationContent(reader.ReadElementString()); ... </code></pre> <p>As a workaround, I've resorted to using the RSS20FeedFormatter to build the RSS, and then patch the RSS manually. For example:</p> <pre><code> StringBuilder buffer = new StringBuilder(); XmlTextWriter writer = new XmlTextWriter(new StringWriter(buffer)); feedFormatter.WriteTo(writer ); // feedFormatter = RSS20FeedFormatter PostProcessOutputBuffer(buffer); WebOperationContext.Current.OutgoingResponse.ContentType = "application/xml; charset=utf-8"; return new MemoryStream(Encoding.UTF8.GetBytes(buffer.ToString())); </code></pre> <p>...</p> <pre><code> public void PostProcessOutputBuffer(StringBuilder buffer) { var xmlDoc = XDocument.Parse(buffer.ToString()); foreach (var element in xmlDoc.Descendants("channel").First() .Descendants("item") .Descendants("description")) { VerifyCdataHtmlEncoding(buffer, element); } foreach (var element in xmlDoc.Descendants("channel").First() .Descendants("description")) { VerifyCdataHtmlEncoding(buffer, element); } buffer.Replace(" xmlns:a10=\"http://www.w3.org/2005/Atom\"", " xmlns:atom=\"http://www.w3.org/2005/Atom\""); buffer.Replace("a10:", "atom:"); } private static void VerifyCdataHtmlEncoding(StringBuilder buffer, XElement element) { if (!element.Value.Contains("&lt;") || !element.Value.Contains("&gt;")) { return; } var cdataValue = string.Format("&lt;{0}&gt;&lt;![CDATA[{1}]]&gt;&lt;/{2}&gt;", element.Name, element.Value, element.Name); buffer.Replace(element.ToString(), cdataValue); } </code></pre> <p>The idea for this workaround came from the following location, I just adapted it to work with WCF instead of MVC. <a href="http://localhost:8732/Design_Time_Addresses/SyndicationServiceLibrary1/Feed1/" rel="noreferrer">http://localhost:8732/Design_Time_Addresses/SyndicationServiceLibrary1/Feed1/</a></p> <p>I'm just wondering if this is simply a bug in Rss20FeedFormatter or is it by design? Also, if anyone has a better solution, I'd love to hear it!</p>
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