Can you create a simple 'EqualityComparer' using a lambda expression

Question

Short question:

Is there a simple way in LINQ to objects to get a distinct list of objects from a list based on a key property on the objects.

Answer 1

implement IEquatable on GalleryImage because it is generated

A different approach would be to generate GalleryImage as a partial class, and then have another file with the inheritance and IEquatable, Equals, GetHash implementation.