LINQ取复杂列表

    class Program
    {
        public class Order
        {
            public int ID { get; set; }

            public string OrderNo { get; set; }
        }

        public class OrderDetail
        {
            public int ID { get; set; }

            public int OrderID { get; set; }

            public int ProductId { get; set; }
        }

        public class Product
        {
            public int ID { get; set; }
            public string Images { get; set; }
        }
        static void Main(string[] args)
        {
            //SendSMS();
            //Charge();
            var orderList = new List<Order>()
            {
                new Order(){ ID=1 ,OrderNo = "aaa"},
                new Order(){ ID=2 ,OrderNo = "bbb"}
            };
            var orderdetaillist = new List<OrderDetail>(){
                new OrderDetail(){ ID=1, OrderID=1, ProductId = 1},
                new OrderDetail(){ ID=2, OrderID=1, ProductId = 3},
                new OrderDetail(){ ID=3, OrderID=1, ProductId = 4},

                new OrderDetail(){ ID=4, OrderID=2, ProductId = 2},
                new OrderDetail(){ ID=5, OrderID=2, ProductId = 5},
            };
            var productList = new List<Product>(){
            new Product(){ ID=1,Images = "111"},
            new Product(){ ID=2,Images = "222"},
            new Product(){ ID=3,Images = "333"},
            new Product(){ ID=4,Images = "444"},
            new Product(){ ID=5,Images = "555"}
            };

            var list = (from order in orderList
                        join yo in
                            (from d in orderdetaillist
                             join p in productList on d.ProductId equals p.ID
                             select new { d.OrderID, p.Images }) on order.ID equals yo.OrderID into gg
                        select new
                        {
                            order.OrderNo,
                            Images = (from fuck in gg select fuck.Images).ToList()
                        }).ToList();
            foreach (var item in list)
            {
                Console.WriteLine("订单号:" + item.OrderNo);
                Console.WriteLine("产品图片:");
                foreach (var pic in item.Images)
                {
                    Console.WriteLine("     " + pic);
                }
                Console.WriteLine();
            }
            Console.ReadKey();
}

效果如下: