public bool Equals(Product x, Product y)
{
// This gives an "early out" for equal references or the case where one reference is null.
return(PartialComparer.ReferenceEquals(x, y) ??
x.Name == y.Name &&
x.Popularity == y.Popularity &&
x.Price == y.Price);
}
public int Compare(Product first, Product second)
{
return(PartialComparer.ReferenceCompare(first, second) ??
// Reverse comparison of popularity to sort descending
PartialComparer.Compare(second.Popularity, first.Popularity) ??
PartialComparer.Compare(first.Price, second.Price) ??
PartialComparer.Compare(first.Name, second.Name) ??
0);
}