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copied!<p>Like so?</p> <pre><code>using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Xml.Serialization; public class MyBase { } public class ConcreteType : MyBase { [XmlAttribute("att")] public string Value { get; set; } } [XmlRoot("mycoreobject")] public class SomeRoot { public List<MyBase> Items { get; set; } } static class Program { static void Main() { XmlAttributeOverrides xao = new XmlAttributeOverrides(); XmlAttributes extraTypes = new XmlAttributes(); extraTypes.XmlArray = new XmlArrayAttribute("somethings"); // assume loaded dynamically, along with name/namespace extraTypes.XmlArrayItems.Add(new XmlArrayItemAttribute("plugintype1", typeof(ConcreteType)) { Namespace = "my-plugin-namespace" }); xao.Add(typeof(SomeRoot), "Items", extraTypes); // important: need to cache and re-use "ser", or will leak assemblies XmlSerializer ser = new XmlSerializer(typeof(SomeRoot), xao); //example 1: writing var obj = new SomeRoot { Items = new List<MyBase> { new ConcreteType { Value = "abc" } } }; XmlSerializerNamespaces ns = new XmlSerializerNamespaces(); ns.Add("", ""); ns.Add("ass1", "my-plugin-namespace"); ser.Serialize(Console.Out, obj, ns); // example 2: reading string xml = @"<mycoreobject xmlns:ass1=""my-plugin-namespace""> <somethings> <ass1:plugintype1 att=""aaa""/> </somethings> </mycoreobject>"; obj = (SomeRoot)ser.Deserialize(new StringReader(xml)); var foundIt = (ConcreteType)obj.Items.Single(); Console.WriteLine(); Console.WriteLine(foundIt.Value); // should be "aaa" } } </code></pre>

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