gistfile1.cs

//example expando...
public class ExtensibleClass : IFlyweight
{

private Dictionary<string, object> _props = new Dictionary<String, object>();

public object this[String key]{
   get{
      return this._props[key];
   }
   set
   {
      this._props[key];
   }
}

public IEnumerable<ExpandoProperty> AllProperties(){
   return this._props.Select(y=>new ExpandoProperty(y.Key, y.Value));

}

}