Proof of concept for use of Castle Dynamic Proxy for question at http://stackoverflow.com/questions/8497111/framework-for-asp-net-data-binding-wrapper-classes

DynamicProxyTest.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Castle.DynamicProxy;
using System.Web.UI;

namespace DynamicProxyTest
{
	class Program
	{
		static void Main(string[] args)
		{
			List<User> users = new List<User>();
			users.Add(new User { FirstName = "John", LastName = "Doe" });
			users.Add(new User { FirstName = "Jane", LastName = "Doe" });

			var userProxies = users
				.ProxyAddMixins(u => new UserProxyImpl { User = u })
				.ToList();

			Console.WriteLine("First\tLast\tFull");
			foreach (var userProxy in userProxies)
			{
				Console.WriteLine("{0}\t{1}\t{2}",
					DataBinder.Eval(userProxy, "FirstName"),
					DataBinder.Eval(userProxy, "LastName"),
					DataBinder.Eval(userProxy, "FullName"));
			}
			Console.ReadLine();
		}
	}

	public class User
	{
		public virtual string FirstName { get; set; }
		public virtual string LastName { get; set; }
	}

	public interface IUserProxy
	{
		string FullName { get; }
	}

	public class UserProxyImpl : IUserProxy
	{
		public User User { get; set; }

		public string FullName
		{
			get { return User.FirstName + " " + User.LastName; }
		}
	}

	public static class ProxyExtensions
	{
		public static IEnumerable<T> ProxyAddMixins<T>(this IEnumerable<T> collection, params Func<T, object>[] mixinSelectors)
			where T : class
		{
			ProxyGenerator factory = new ProxyGenerator();
			foreach (T item in collection)
			{
				ProxyGenerationOptions o = new ProxyGenerationOptions();
				foreach (var func in mixinSelectors)
				{
					object mixin = func(item);
					o.AddMixinInstance(mixin);
				}
				yield return factory.CreateClassProxyWithTarget<T>(item, o);
			}
		}
	}

}