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    <p>Your first issue is that you don't have XML - you have a stream of bytes which can be loaded into an <code>XDocument</code> or <code>XmlDocument</code>. Do you really need to output to a stream instead of directly into an XML Document?</p> <p>BTW, I think you need to lose the <code>using</code> block around the <code>MemoryStream</code>. You won't be able to use the stream for much after it's been disposed.</p> <pre><code>public void AppendElement() { XDocument doc; using(MemoryStream stream = GetXml()) { using(var sr = new StreamReader(stream)) { doc = XDocument.Load(sr); } } if(doc.Root != null) { doc.Root.Add(new XElement("Whatever")); } } private static MemoryStream GetXml() { var settings = new XmlWriterSettings {Indent = true}; var memoryStream = new MemoryStream(); using (XmlWriter writer = XmlWriter.Create(memoryStream, settings)) { writer.WriteStartDocument(); writer.WriteStartElement("root"); writer.WriteStartElement("element"); writer.WriteString("content"); writer.WriteEndElement(); writer.WriteEndElement(); writer.WriteEndDocument(); writer.Flush(); } return memoryStream; } </code></pre> <p>For efficiency, try to work directly with <code>XDocument</code>. You seem to want to use <code>XmlWriter</code>, so here's how to do it (not tested):</p> <pre><code>public void AppendElement() { XDocument doc = GetXml(); if(doc.Root != null) { doc.Root.Add(new XElement("Whatever")); } } private static XDocument GetXml() { var doc = new XDocument(); using (XmlWriter writer = doc.CreateWriter()) { writer.WriteStartDocument(); writer.WriteStartElement("root"); writer.WriteStartElement("element"); writer.WriteString("content"); writer.WriteEndElement(); writer.WriteEndElement(); writer.WriteEndDocument(); writer.Flush(); } return doc; } </code></pre> <hr> <p><strong>Update:</strong> </p> <p>You can write the XML with</p> <pre><code>doc.Save(HttpContext.Response.Output); </code></pre> <hr> <p>Again, I can't test it now, but try this:</p> <pre><code>private static XDocument GetXml() { return new XDocument( new XElement( "root", new XElement( "element", "content"))); } </code></pre>
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    1. POHow to append new elements to Xml from a stream
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    1. USJohn Saunders
    1. USJohn Saunders
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    1. COIndeed i could return an XDocument if that makes it easiest to inject additional elements. Not really sure what is best to keep the overheads low. Hence my initial reason to return a stream.
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    2. COYour last edit (static XDocument GetXml()) is actually like something I just wrote and tested, so yes, it does work. Good work.
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      1. USAnthony Pegram
 

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