Pastable version of Polymorphic XML serializer

<pre class='prettyprint' language='cs'>public class XmlStringSerializer
	{
		static Dictionary&lt;string, Type&gt; types = new Dictionary&lt;string, Type&gt;();
		public string Serialize(object o)
		{
			StringBuilder sb = new StringBuilder();
			Type t = o.GetType();
			if (t.IsSerializable)
			{
				XmlSerializer serializer = new XmlSerializer(t);
				using (TextWriter tw = new StringWriter(sb))
				{
					var namespaces = new XmlSerializerNamespaces();
					namespaces.Add(&quot;&quot;, &quot;&quot;);
					serializer.Serialize(tw, o, namespaces);
					tw.Close();
				}
			}
			else
			{
				throw new InvalidOperationException(string.Format(&quot;Objects of type {0} are not serializable.&quot;, t.Name));
			}
			sb.Remove(0, 42);
			sb.Insert(0, '.');
			sb.Insert(0, t.Namespace);
			sb.Insert(0, '&lt;');
			return sb.ToString();

}

public T DeSerializeObject&lt;T&gt;(string content)
		{
			var typeName = content.Substring(1, content.IndexOf(' ', 20) - 1);
			Type type;
			if (!types.ContainsKey(typeName))
			{
				type = AppDomain.CurrentDomain.GetAssemblies().SelectMany(a =&gt; a.GetTypes()).Single(t =&gt; t.FullName == typeName);
				lock (types)
				{
					types[typeName] = type;
				}
			}
			else
			{
				type = types[typeName];
			}
			object o;
			var serializer = new XmlSerializer(type);
			int posAfterTypeName = content.IndexOf(' ');
			int posOfStartOfTypeName = content.LastIndexOf('.', posAfterTypeName) + 1;

content = @&quot;&lt;?xml version=&quot;&quot;1.0&quot;&quot; encoding=&quot;&quot;utf-16&quot;&quot;?&gt;&lt;&quot; + content.Substring(posOfStartOfTypeName);
			using (TextReader tr = new StringReader(content))
			{
				o = serializer.Deserialize(tr);
				tr.Close();
			}
			return (T) o;
		}
	}</pre>
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Pastable version of Polymorphic XML serializer