.NET MVC4 实训记录之三（EntityFramework 与枚举）

2023-08-21 10:26:34

　　EntityFramework对枚举的引入是从版本5开始的（如果没有记错的话）。枚举可以很大程度上提高对程序的可读性。那么在EntityFramework的CodeFirst模式下，如何使用枚举呢？答案很简单：还是那么用！

　　看似废话，其实不然，看下面（修改上一篇中用户信息定义）：

     /// <summary>

     /// 性别枚举

     /// </summary>

     public enum Gender

     {

         Male,

         Female

     }

     public class UserProfile

     {

         [Key]

         [DatabaseGenerated(DatabaseGeneratedOption.Identity)]

         [Column(Order = )]

         public int UserId { get; set; }

         [Column(Order = )]

         [Required]

         public string UserName { get; set; }

         [Column(Order = )]

         public string UserCode { get; set; }

         [Column(Order = )]

         public int Status { get; set; }

         [Column(Order = )]

         public string Email { get; set; }

         [Column(Order = )]

         public Gender Gender { get; set; }

         [Column(Order = )]

         public int? CreatorId { get; set; }

         public virtual ICollection<Role> Roles { get; set; }

         public int? AddressId { get; set; }

         [ForeignKey("AddressId")]

         public Address Address { get; set; }

         public UserProfile()

         {

             Gender = Framework.DomainModels.Gender.Male;

         }

     }

　　删除旧的数据库，重新运行项目，看看会有什么结果！

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" 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　　好像没什么变化？--------确实没有什么变化！别着急，继续往下看！

　　在AccountController中新增修改用户的Action，添加用户编辑视图。

/*  加载编辑页面的Action   */

        public ActionResult EditUser(int id)

        {

            var model = BaseService.GetSingle<UserProfile>(id);     //按照ID获取用户数据

            return View(model);

        }

/*  编辑页面视图  */

@model Framework.DomainModels.UserProfile

@{

    ViewBag.Title = "EditUser";

}

<h2>EditUser</h2>

@using (Html.BeginForm())

{

    @Html.EditorForModel();

}

　　运行你的项目，输入连接http://localhost:****/Account/EditUser/1看看结果（注意，最后一个1是你已经注册的某个用户的ID，前提是你的路由配置要支持这种访问。其实就是创建项目时的默认路由配置）。

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" alt="" width="425" height="456" />

　　OK，枚举变量名已经显示，并非我们在数据库中看到的Int型的值。EF还是比较聪明的。其实这个字段应该显示为一个下拉列表，而并非文本框才最合理。

　　一些思考：对于项目而言，并非是所有可以分类的字段都适合使用枚举类型。例如用户状态Status字段，我们可以用数字0表示用未激活，1表用户已激活。为使我们的代码开起来很优雅，然后就用枚举类型描述这个字段。当然这样做没有错，但是如果考虑到扩展性的话，这样做就是一个硬伤。假如我给用户状态增加一个“锁定”，表示用户已经登录，不能再在其它地方登录的话，就必须修改我们的枚举定义。那么这种情况下，建议还是使用普通的Int型（或字符型）字段比较好。虽然我们需要做一些判断将用户可读懂的状态信息显示，但比起修改类型定义带来的好处更多。往后我们还会继续讨论，如何让代码自动识别这些Int型（或字符型）的字段，将可读性更高的信息展示给用户（我自己都很期待噢）。

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