Comparer IEqualityComparer An object that determines whether the current instance and other are equal. = to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable types. There are also issues involving interfaces and operator overloading. This is really amazing https://johnnygqyfn.wikibestproducts.com/801751/değil_hakkında_detaylar_bilinen_c_istructuralequatable_kullanımı