Entity Framework练习题-白红宇

1. 问题: 变量id2的值是1，还是2? 假如如下面的注释操作，movies2有几条记录？里面会包含ID = 1的记录吗？

var id1 = db.Movies.First().ID;var movies1 = db.Movies.ToList();var movie = from m in db.Movieswhere m.ID.Equals(1)select m;movie.First().ID = 2;var id2 = db.Movies.First().ID;//下面设置断点，运行到断点处后，手动向数据库中再添加一条记录var movies2 = db.Movies.ToList();

2. 问题: movie2的price是多少？

var movie1 = db.Movies.Find(1);movie1.Price = 100;var movie2 = db.Movies.Find(1);

3. 下面movie1和move2的类型一样吗？User1和User2类型一样吗？

定义了下面的Model

public class Movie    {        public int ID { get; set; }        public string Title { get; set; }        public DateTime ReleaseDate { get; set; }        public string Genre { get; set; }        public decimal Price { get; set; }        public virtual Category Category { get; set; }    }    public class Category    {        public int ID { get; set; }        public string Name { get; set; }        public virtual ICollection
      
        Movies { get; set; }    }         public class User    {        public string Name{
    get;set;}    }

使用不同的方式创建Movie, User对象

var movie1 = db.Movies.Create();var movie2 = new Movie();var user1 = db.User.Create();var user2 = new User();

本文转自JustRun博客园博客，原文链接：http://www.cnblogs.com/JustRun1983/archive/2012/10/09/2716830.html，如需转载请自行联系原作者