You Don't implement explicitly an equality operator, so == is not defined particularly for the type. Note that the example does derece directly call the CompareTo method. The method is called implicitly by the Sort(Array, IComparer) method for each tuple object in the array. But, needless to input StructruralEqualityComparer because https://c-object-kullan-m85050.theisblog.com/28500866/5-basit-teknikleri-için-c-structuralcomparisons-nedir