differences between two objects in C#

Question

I was wondering how I would find the difference between two objects of the same class. So if I had a Person class with the only difference being Age it will return the field

Answer 1

What about something like this

This gets you a list of the property names that are different between the two objects. I don't think this is all the way to the solution you are looking for but I think it is a decent start

Foo foo1 = new Foo { Prop1 = "One", Prop2 = "Two"};
Foo foo2 = new Foo { Prop1 = "One", Prop2 = "Three" };

Type fooType = typeof (Foo);

PropertyInfo[] properties = fooType.GetProperties();

var diffs = from property in properties
  let first = foo1
  let second = foo2
  where property.GetValue(first, null) != property.GetValue(second, null)
  select property;

In my example this would return "Prop2" as that is the property whose values differ betwen the objects.

EDIT: Of course this assumes any complex types in your object implement equality comparisons that do what you expect. If not you would need to dive down the object graph and do nested compares as others have suggested