public static void Test()
{
Basket b1 = new Basket();
b1.AddFruit(new Banana()
{
Description =
new FruitDescription(FruitSize.Medium, FruitColor.Blue)
});
b1.AddFruit(new Banana()
{
Description =
new FruitDescription(FruitSize.Medium, FruitColor.Green)
});
Basket b2 = new Basket();
b2.AddFruit(new Pear()
{
Description =
new FruitDescription(FruitSize.Medium, FruitColor.Green)
});
List <Basket> source = new List <Basket>();
source.Add(b1);
source.Add(b2);
//the main event - a query.
List <Pair <Fruit, Basket> > result =
(
from basket in source
from fruit in basket.GetFruits()
select new Pair <Fruit, Basket>()
{
First = fruit, Second = basket
}
).ToList();
//a second results structure for fun
ILookup <Type, Basket> resultByType = result.ToLookup
(
p => p.First.GetType(),
p => p.Second
);
Console.WriteLine("Number of fruit: {0}",
result.Count);
Console.WriteLine("Number of apples: {0}",
resultByType[typeof(Apple)].Count());
Console.WriteLine("Number of baskets with apples: {0}",
resultByType[typeof(Apple)].Distinct().Count());
Console.WriteLine("Number of bananas: {0}",
resultByType[typeof(Banana)].Count());
Console.WriteLine("Number of baskets with bananas: {0}",
resultByType[typeof(Banana)].Distinct().Count());
}