Getting each property as added or deleted when comparing against a null object

[PeterOsterdahl]

Hi Valera! I'm wondering what the best way would be to change the behaviour when one of the compared objects is null and the other isn't. In the default implementation one value would be '' and the other object.ToString(). The result I'm looking for is to have each property of the not null object returned as added or deleted (depending on if they are from obj1 or obj2). Is this possible?

Great work by the way! //Peter

[ValeraT1982]

Don't think it's possible. Can you please give an example of the objects and comparison result you want?

[PeterOsterdahl]

It's rather simple class A{ public string Name {get;set;} } class B { public int Id {get; set;} public A InnerA {get;set;} }

var B1 = new B{ Id = 1, InnerA = new A{Name = "a"}}; var B2 = new B{ Id = 1};

Comparing should yield something like : Difference: DifferenceType=MissedElementInSecondObject, MemberPath='InnerA.Name', Value1='a', Value2=''

[ValeraT1982]

You can loop through differences and change '' to added or deleted.

[PeterOsterdahl]

I think the default behaviour of the Comparer when one object is null is to return new Difference(string.Empty, DefaultValueComparer.ToString(obj1), DefaultValueComparer.ToString(obj2)); so the output will be Difference: DifferenceType=ValueMismatch, MemberPath='InnerA', Value1='ObjectsComparer.Examples.Example6.Example6Tests+A', Value2=''. So there is really nothing to iterate. I solved this by creating my own Comparer now but I wondered if there was something more elegant that could be done

[ValeraT1982]

I don't see any elegant solution for your case.