使用EF Code First搭建简易ASP.NET MVC网站并允许数据库迁移

    public class Person
    {
        public int ID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

using System.Data.Entity;
namespace MvcApplication1.Models
{
    public class PersonContext : DbContext
    {
        // 您可以向此文件中添加自定义代码。更改不会被覆盖。
        // 
        // 如果您希望只要更改模型架构，Entity Framework
        // 就会自动删除并重新生成数据库，则将以下
        // 代码添加到 Global.asax 文件中的 Application_Start 方法。
        // 注意: 这将在每次更改模型时销毁并重新创建数据库。
        // 
        // System.Data.Entity.Database.SetInitializer(new System.Data.Entity.DropCreateDatabaseIfModelChanges<MvcApplication1.Models.PersonContext>());
        public PersonContext() : base("name=PersonContext")
        {
        }
        public DbSet<Person> People { get; set; }
    }
}

  <connectionStrings>
    ......
    <add name="PersonContext" connectionString="Data Source=(localdb)\v11.0; Initial Catalog=PersonContext-20150210155119; Integrated Security=True; MultipleActiveResultSets=True; AttachDbFilename=|DataDirectory|PersonContext-20150210155119.mdf"
      providerName="System.Data.SqlClient" />
  </connectionStrings>

namespace MvcApplication1.Migrations
{
    using System;
    using System.Data.Entity;
    using System.Data.Entity.Migrations;
    using System.Linq;
    internal sealed class Configuration : DbMigrationsConfiguration<MvcApplication1.Models.PersonContext>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = false;
        }
        protected override void Seed(MvcApplication1.Models.PersonContext context)
        {
            //  This method will be called after migrating to the latest version.
            //  You can use the DbSet<T>.AddOrUpdate() helper extension method 
            //  to avoid creating duplicate seed data. E.g.
            //
            //    context.People.AddOrUpdate(
            //      p => p.FullName,
            //      new Person { FullName = "Andrew Peters" },
            //      new Person { FullName = "Brice Lambson" },
            //      new Person { FullName = "Rowan Miller" }
            //    );
            //
        }
    }
}

namespace MvcApplication1.Migrations
{
    using System;
    using System.Data.Entity.Migrations;
    
    public partial class initial : DbMigration
    {
        public override void Up()
        {
            CreateTable(
                "dbo.People",
                c => new
                    {
                        ID = c.Int(nullable: false, identity: true),
                        FirstName = c.String(),
                        LastName = c.String(),
                    })
                .PrimaryKey(t => t.ID);
            
        }
        
        public override void Down()
        {
            DropTable("dbo.People");
        }
    }
}

    public class Person
    {
        public int ID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }
    }