在我的应用程序中，我有配方的概念，每个配方都有可以被另一种成分替换的成分。我想做的是用每个成分生成每种可能性。我有以下结构作为CLR对象：

public class Food
{
    public Food()
    {
        NutritionalValues = new Collection<FoodNutritionalValue>();
    }

    public string Name { get; set; }
    public string Category { get; set; }

    public ICollection<FoodNutritionalValue> NutritionalValues { get; set; }
}

public class FoodNutritionalValue
{
    public string Type { get; set; }
    public decimal Value { get; set; }
}

public class Recipe
{
    public Recipe()
    {
        IngredientGroups = new Collection<IngredientGroup>();
    }

    public string Name { get; set; }
    public ICollection<IngredientGroup> IngredientGroups { get; set; }
}

public class IngredientGroup
{
    public IngredientGroup()
    {
        Ingredients = new Collection<Food>();
    }

    public ICollection<Food> Ingredients { get; set; }
}

IngredientGroup是可以相互替换的，因此，对于一个食谱来说，每个IngredientGroup都需要有一种配料。但是，由于我不知道IngredientGroup的数量，所以我无法通过迭代来找出每一种可能性。
例如，如果我事先知道IngredientGroups.Count的计数，下面的代码可以正常工作：

Recipe recipe2 = new Recipe();
IngredientGroup ingredientGroup3 = new IngredientGroup();
IngredientGroup ingredientGroup4 = new IngredientGroup();
IngredientGroup ingredientGroup5 = new IngredientGroup();

recipe2.Name = "Recipe2";
ingredientGroup3.Ingredients.Add(new Food { Name = "Food8", Category = "Categor8" });
ingredientGroup3.Ingredients.Add(new Food { Name = "Food9", Category = "Categor9" });

ingredientGroup4.Ingredients.Add(new Food { Name = "Food5", Category = "Categor5" });
ingredientGroup4.Ingredients.Add(new Food { Name = "Food10", Category = "Categor10" });
ingredientGroup4.Ingredients.Add(new Food { Name = "Food11", Category = "Category11" });

ingredientGroup5.Ingredients.Add(new Food { Name = "Food3", Category = "Categor3" });
ingredientGroup5.Ingredients.Add(new Food { Name = "Food4", Category = "Categor4" });

recipe2.IngredientGroups.Add(ingredientGroup3);
recipe2.IngredientGroups.Add(ingredientGroup4);
recipe2.IngredientGroups.Add(ingredientGroup5);

var recipes = new[] { recipe2 };

List<string> results = new List<string>();
foreach (var rcp in recipes)
{
    var group1 = rcp.IngredientGroups.ElementAt(0);
    var group2 = rcp.IngredientGroups.ElementAt(1);
    var group3 = rcp.IngredientGroups.ElementAt(2);

    foreach (var item1 in group1.Ingredients)
        foreach (var item2 in group2.Ingredients)
            foreach (var item3 in group3.Ingredients)
            {
                results.Add(string.Format("{0}, {1}, {2}", item1.Name, item2.Name, item3.Name));
            }
}

我确信我在这里遗漏了一些东西。我如何在运行时生成每一种可能性？