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POHow to remove duplicate attributes from XML with C#
 

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  1. POHow to remove duplicate attributes from XML with C#
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    <p>I am parsing some XML files from a third party provider and unfortunately it's not always well-formed XML as sometimes some elements contain duplicate attributes.</p> <p>I don't have control over the source and I don't know which elements may have duplicate attributes nor do I know the duplicate attribute names in advance.</p> <p>Obviously, loading the content into an <code>XMLDocument</code> object raises an XmlException on the duplicate attributes so I though I could use an <code>XmlReader</code> to step though the XML element by element and deal with the duplicate attributes when I get to the offending element.</p> <p>However, the <code>XmlException</code> is raised on <code>reader.Read()</code> - before I get a chance to insepct the element's attributes. </p> <p>Here's a sample method to demonstrate the issue:</p> <pre><code>public static void ParseTest() { const string xmlString = @"&lt;?xml version='1.0'?&gt; &lt;!-- This is a sample XML document --&gt; &lt;Items dupattr=""10"" id=""20"" dupattr=""33""&gt; &lt;Item&gt;test with a child element &lt;more/&gt; stuff&lt;/Item&gt; &lt;/Items&gt;"; var output = new StringBuilder(); using (XmlReader reader = XmlReader.Create(new StringReader(xmlString))) { XmlWriterSettings ws = new XmlWriterSettings(); ws.Indent = true; using (XmlWriter writer = XmlWriter.Create(output, ws)) { while (reader.Read()) /* Exception throw here when Items element encountered */ { switch (reader.NodeType) { case XmlNodeType.Element: writer.WriteStartElement(reader.Name); if (reader.HasAttributes){ /* CopyNonDuplicateAttributes(); */} break; case XmlNodeType.Text: writer.WriteString(reader.Value); break; case XmlNodeType.XmlDeclaration: case XmlNodeType.ProcessingInstruction: writer.WriteProcessingInstruction(reader.Name, reader.Value); break; case XmlNodeType.Comment: writer.WriteComment(reader.Value); break; case XmlNodeType.EndElement: writer.WriteFullEndElement(); break; } } } } string str = output.ToString(); } </code></pre> <p>Is there another way to parse the input and remove the duplicate attributes without having to use regular expressions and string manipulation?</p>
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    1. COIt can only be possible if the XML processor API provider any hooks that allows you to hook into the processing and handle the error conditions
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    2. COInteresting problem, look forward to seeing the solution!
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      1. USKieren Johnstone
    3. COThere will be no solution to this problem using XML, because your input is not XML. You say you have no control over the input, but can you at least make your superiors aware that your vendor is not sending you XML? Can you at least make sure that your _vendor_ knows this? Any organization stupid enough to send this data might be stupid enough to not realize that it's not XML.
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      1. USJohn Saunders
 

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