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POSerialize List<T> containing List<T>
 

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    <p>I am trying to serialize a list that contains non-system types.</p> <p>Below is my serialization code which is working fine on the top level. and returns a valid XmlDocument, but doesn't seem to contain anything in a inner list.</p> <p>I've looked around the net - and around SO - but can't seem to find anything!</p> <p>Any help much appreciated.</p> <p>Code:</p> <pre><code>public static XmlDocument SerializeToXML&lt;T&gt;(List&lt;T&gt; list, string rootElement) { XmlAttributeOverrides overrides = new XmlAttributeOverrides(); XmlAttributes attr = new XmlAttributes(); attr.XmlRoot = new XmlRootAttribute(rootElement); overrides.Add(typeof(List&lt;T&gt;), attr); XmlDocument xmlDoc = new XmlDocument(); XPathNavigator nav = xmlDoc.CreateNavigator(); using (XmlWriter writer = nav.AppendChild()) { XmlSerializer ser = new XmlSerializer(typeof(List&lt;T&gt;), overrides); ser.Serialize(writer, list); } return xmlDoc; } </code></pre> <p>Code used to test: </p> <pre><code>[TestFixture] public class BaseTesting { [Test] public void test() { List&lt;ListTestClass&gt; list = new List&lt;ListTestClass&gt;(); for (int i = 0; i &lt; 20; i++) { list.Add(new ListTestClass() { intProp = 1, stringProp = "string1", dtProp = DateTime.Now }); } XmlDocument doc = Beyond.Base.Util.XMLUtils.SerializeToXML&lt;ListTestClass&gt;(list, "root"); } } public class ListTestClass { public int intProp { get; set; } public string stringProp { get; set; } public DateTime dtProp { get; set; } [XmlElement("Inner",typeof(InnerListTestClass))] public InnerListTestClass inner { get { return new InnerListTestClass() { intProp = 1, stringProp = "string1", dtProp = DateTime.Now }; } } } public class InnerListTestClass { public int intProp { get; set; } public string stringProp { get; set; } public DateTime dtProp { get; set; } } </code></pre> <p>XML Output:</p> <pre><code>&lt;root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;ListTestClass&gt; &lt;intProp&gt;1&lt;/intProp&gt; &lt;stringProp&gt;string1&lt;/stringProp&gt; &lt;dtProp&gt;2011-06-07T09:43:35.1017998+01:00&lt;/dtProp&gt; &lt;/ListTestClass&gt; &lt;/root&gt; </code></pre>
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