static IEnumerable <Tuple <Product, Product> > GetPairedProducts(ProductShowcase showcase)
{
using (var iterator = showcase.GetEnumerator()) {
while (iterator.MoveNext())
{
var first = iterator.Current;
var second = iterator.MoveNext() ? iterator.Current : default(Product);
yield return(Tuple.Create(first, second));
}
}
}
public PairedProductShowcase(ProductShowcase showcase) : base(showcase.Category, GetPairedProducts(showcase))
{
}