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using System;using System.Linq;namespace ConsoleApplication21{    public class Product    {        public int ProductID { get; set; }        public string Name { get; set; }        public string Description { get; set; }        public decimal Price { get; set; }        public string Category { set; get; }    }    class Program    {        static void Main(string[] args)        {            Product[] products = {                new Product {Name = "西瓜", Category = "水果", Price = 2.3M},                new Product {Name = "苹果", Category = "水果", Price = 4.9M},                new Product {Name = "空心菜", Category = "蔬菜", Price = 2.2M},                new Product {Name = "地瓜", Category = "蔬菜", Price = 1.9M}            };            var results = from product in products                          orderby product.Price descending                          select new { product.Name, product.Price };            var res2 = products.Where(r=>r.Name=="地").Count();            Console.WriteLine(res2);            var res1 = products.Single(g => g.Name == "地瓜");            Console.WriteLine("商品：{0}，价钱：{1}", res1.Name, res1.Price);            var res = products.Sum(p => p.Price);            /*            //打印价钱最高的三个商品            int count = 0;            foreach (var p in results)            {                Console.WriteLine("商品：{0}，价钱：{1}", p.Name, p.Price);                if (++count == 3) break;            }            Console.ReadKey();            */        }    }}

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