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POParsing an XML string containing " " (which must be preserved)
 

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    <p>I have code that is passed a <code>string</code> containing XML. This XML may contain one or more instances of <code>&amp;#x20;</code> (an entity reference for the blank space character). I have a requirement that these references should not be resolved (i.e. they should <em>not</em> be replaced with an actual space character).</p> <p>Is there any way for me to achieve this?</p> <p>Basically, given a string containing the XML:</p> <pre><code>&lt;pattern value="[A-Z0-9&amp;#x20;]" /&gt; </code></pre> <p>I do <strong>not</strong> want it to be converted to:</p> <pre><code>&lt;pattern value="[A-Z0-9 ]" /&gt; </code></pre> <p>(What I am actually trying to achieve is to simply take an XML string and write it to a "pretty-printed" file. This is having the side-effect of resolving occurrences of <code>&amp;#x20;</code> in the string to a single space character, which need to be preserved. The reason for this requirement is that the written XML document must conform to an externally-defined specification.)</p> <p>I have tried creating a sub-class of <code>XmlTextReader</code> to read from the XML string and overriding the <code>ResolveEntity()</code> method, but this isn't called. I have also tried assigning a custom <code>XmlResolver</code>.</p> <p>I have also tried, as suggested, to "double encode". Unfortunately, this has not had the desired effect, as the <code>&amp;amp;</code> is <em>not</em> decoded by the parser. Here is the code I used:</p> <pre><code>string schemaText = @"...&lt;pattern value=""[A-Z0-9&amp;#x26;#x20;]"" /&gt;..."; XmlWriterSettings writerSettings = new XmlWriterSettings(); writerSettings.Indent = true; writerSettings.NewLineChars = Environment.NewLine; writerSettings.Encoding = Encoding.Unicode; writerSettings.CloseOutput = true; writerSettings.OmitXmlDeclaration = false; writerSettings.IndentChars = "\t"; StringBuilder writtenSchema = new StringBuilder(); using ( StringReader sr = new StringReader( schemaText ) ) using ( XmlReader reader = XmlReader.Create( sr ) ) using ( TextWriter tr = new StringWriter( writtenSchema ) ) using ( XmlWriter writer = XmlWriter.Create( tr, writerSettings ) ) { XPathDocument doc = new XPathDocument( reader ); XPathNavigator nav = doc.CreateNavigator(); nav.WriteSubtree( writer ); } </code></pre> <p>The written XML ends up with:</p> <pre><code>&lt;pattern value="[A-Z0-9&amp;amp;#x20;]" /&gt; </code></pre>
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