Given the following code, I am trying to produce a unique key or hashcode for a set of similar parameters.

using System;
using System.Diagnostics;
using System.Linq;
using System.Linq.Expressions;

public class Program
{
    public static void Main()
    {
        var f = new F();
        var first = f.GetHashCode<Person>(12, x => x.Name == "John");
        var second = f.GetHashCode<Person>(12, x => x.Name == "John");
        var third = f.GetHashCode<Person>(12, x => x.Name == "Mike");

        Console.WriteLine(String.Format("{0}={1}", first, second));
        Console.WriteLine(String.Format("Not Match {0}", third));
    }

    public class Person 
    {
        public string Name {get; set;}
    }

    public class F
    {
        public int GetHashCode<T>(int id, params Expression<Func<T, object>>[] includes) where T: class, new()
        {
            // TODO: what kind of magic goes here
            int hashCode = id;
            foreach(var e in includes){
                var code = e.GetHashCode();
                hashCode *= code;
            }
            return hashCode;
        }
    }
}

In the example above, first and second should match, while third should not.