How to find differences that are nested deep inside a property?

[SubasishMohapatra]

How to find differences that are nested deep inside a property? In the classes mentioned below, how do I get the differences which are listed 2 level deep e.g., Cool.Author.Address.City and Cool.Author.Address.Country

 public class Cool
    {
        public int id;
        public int revision;
        public string[] vehicles;
        public Author author;
        public string tagline;
        public Gender gender;
    }

    public class Author
    {
        public string FirstName;
        public string LastName;
        public Address Address;
    }

    public class Address
    {
        public string City;
        public string Country;
    }

[replaysMike]

@SubasishMohapatra what should have been a simple use case turned out to be a bug! I've fixed this in version 1.0.73 - it turned out I had missed a use case in the tests for include/exclude expressions that have a direct path.

Here's an example that should be working now. The following will compare 2 different objects, but only compare City and Country because we specified that the expressions passed are property includes using ComparisonOptions.IncludeList (by default it treats expressions as excludes, same as option ComparisonOptions.ExcludeList)

var obj1 = new Cool {
  Author = new Author {
    FirstName = "John",
    LastName = "Smith",
    Address = new Address { 
      City = "Los Angeles",
      Country = "USA"
    } 
  }
};
var obj1 = new Cool {
  Author = new Author { 
    FirstName = "Jane",
    LastName = "Doe",
    Address = new Address { 
      City = "Beijing",
      Country = "China"
    } 
  }
};

var diff = obj1.Diff(obj2, ComparisonOptions.All | ComparisonOptions.IncludeList, x => x.Author.Address.City, x => x.Author.Address.Country);
Assert.AreEqual(2, diff.Count); // only City and Country are different

[replaysMike]

also note you don't have to use expressions - you could also just pass the path as follows:

var diff = obj1.Diff(obj2, ComparisonOptions.All | ComparisonOptions.IncludeList, ".Author.Address.City", ".Author.Address.Country");