If The first item in the comparison cannot be cast to an IStructuralEquatable object (in other words, if it is not a collection object that implements the IStructuralEquatable interface), it calls the item's Equals method. I had the same question. When I ran LBushkin's example I was surprised to see https://trevorsfinp.boyblogguide.com/27711534/açıklaması-c-structuralcomparisons-kullanımı-hakkında-5-basit-tablolar