Objectgraph

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var ref1 = new MeteredReference("hello world");
            var list = new List<string> {"foo", "bar", "foobar"};

            var ref2 = new MeteredReference(list);

            GC.Collect();
            Console.WriteLine(ref1.Size);
            Console.WriteLine(ref2.Size);
            list.Clear();
            GC.Collect();
            Console.WriteLine(ref2.Size);
            Console.ReadKey();
        }

        class MeteredReference
        {
            static Type s_type = Type.GetType("System.SizedReference", true, false);

            public MeteredReference(object target)
            {
                _sizedRef = Activator.CreateInstance(s_type, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.CreateInstance, null, new object[]
			        {
				        target
			        }, null);
            }

            public long Size
            {
                get
                {
                    return (long)s_type.InvokeMember("ApproximateSize", BindingFlags.Instance | BindingFlags.Public | BindingFlags.GetProperty, null, _sizedRef, null, CultureInfo.InvariantCulture);
                }
            }

            public object _sizedRef;
        }
    }
}