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    <p>Ok, here is my final solution (hope it helps someone), that can serialize a plain array, List&lt;>, HashSet&lt;>, ...</p> <p>To achieve this, we'll need to tell the serializer what root node to use, and it's kind of tricky...</p> <p>1) Use 'XmlType' on the serializable object</p> <pre><code>[XmlType("link")] public class LinkFinalVersion { [XmlAttribute("href")] public string Url { get; set; } [XmlAttribute("rel")] public string Relationship { get; set; } } </code></pre> <p>2) Code a 'smart-root-detector-for-collection' method, that will return a XmlRootAttribute</p> <pre><code>private XmlRootAttribute XmlRootForCollection(Type type) { XmlRootAttribute result = null; Type typeInner = null; if(type.IsGenericType) { var typeGeneric = type.GetGenericArguments()[0]; var typeCollection = typeof (ICollection&lt;&gt;).MakeGenericType(typeGeneric); if(typeCollection.IsAssignableFrom(type)) typeInner = typeGeneric; } else if(typeof (ICollection).IsAssignableFrom(type) &amp;&amp; type.HasElementType) { typeInner = type.GetElementType(); } // yeepeeh ! if we are working with a collection if(typeInner != null) { var attributes = typeInner.GetCustomAttributes(typeof (XmlTypeAttribute), true); if((attributes != null) &amp;&amp; (attributes.Length &gt; 0)) { var typeName = (attributes[0] as XmlTypeAttribute).TypeName + 's'; result = new XmlRootAttribute(typeName); } } return result; } </code></pre> <p>3) Push that XmlRootAttribute into the serializer</p> <pre><code>// hack : get the XmlRootAttribute if the item is a collection var root = XmlRootForCollection(type); // create the serializer var serializer = new XmlSerializer(type, root); </code></pre> <p>I told you it was tricky ;)</p> <hr> <p>To improve this, you can :</p> <p>A) Create a XmlTypeInCollectionAttribute to specify a custom root name (If the basic pluralization does not fit your need)</p> <pre><code>[XmlType("link")] [XmlTypeInCollection("links")] public class LinkFinalVersion { } </code></pre> <p>B) If possible, cache your XmlSerializer (in a static Dictionary for example).</p> <p>In my testing, instanciating a XmlSerializer without the XmlRootAttributes takes 3ms. If you specify an XmlRootAttribute, it takes around 80ms (Just to have a custom root node name !)</p>
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