asp.net-mvc-3 – ASP .NET MVC 3实体框架禁用代码优先

using System.Data.Entity;
namespace MusicStore.Models
{
    public class MusicStoreEntities:DbContext
    {
        public DbSet<Album> Albums { get; set; }   
        public DbSet<Genre> Genres { get; set; }
    }
}

我的web.config有以下连接字符串

<connectionStrings>
    <add name="MusicStoreEntities"
         connectionString="data source=.SQLEXPRESS;         Integrated Security=SSPI;       
         AttachDBFilename=|DataDirectory|MvcMusicStore.mdf;       User Instance=true"
         providerName="System.Data.SqlClient" />
  </connectionStrings>

DbDatabase.SetInitializer<MusicStoreEntities>(
         new CreateDatabaseIfNotExists<MusicStoreEntities>());

这将使用默认初始化程序,并且只有在找不到数据库时才会创建数据库.实际上有三种可能性：

> CreateDatabaseIfNotExists> DropCreateDatabaseAlways> DropCreateDatabaseIfModelChanges

你也可以在Application_Start()中使用它来做一些自定义初始化

Database.SetInitializer<MusicStoreEntities>(new MusicStoreEntityInitializer());

然后,根据您的需要添加一个派生自三种初始化类型之一的新类.

namespace MusicStore.Models
{
  public class MusicStoreEntityInitializer : 
           CreateDatabaseIfNotExists<MusicStoreEntityInitializer> 
  {
      protected override void Seed(MusicStoreEntity context)
      {
         base.Seed(context);

         // your code to populate db with test data
      }
  } 
}

通过这种设置,您可以获得很大的灵活性.