EF Code First Migrations数据库迁移

转自：EF Code First Migrations数据库迁移

要点：

1. 安装EF：Install-Package EntityFramework
2. 修改类文件PortalContext.cs的静态构造函数：

   static PortalContext()
   {
       Database.SetInitializer<PortalContext>(null);
   }
   

3. 设置允许自动迁移，和迁移时允许数据丢失

    public Configuration()
           {
               AutomaticMigrationsEnabled = true;
               AutomaticMigrationDataLossAllowed = true;
               ContextKey = "ConsoleApplication1.PortalContext";
           }

4. 数据迁移：Update-Database -Verbose