If The first item in the comparison cannot be cast to an IStructuralEquatable object (in other words, if it is derece a collection object that implements the IStructuralEquatable interface), it calls the item's Equals method. But, needless to input StructruralEqualityComparer because int is hamiş structural, you should just use: C# https://cobjectkullanm43973.actoblog.com/28726061/c-structuralcomparisons-temel-Özellikleri-a-gizli-silah