The approach you have used is the "manual" code first migrations.
你用的方法是“手动”代码首先迁移。
How to avoid migrations in model first database with Entity Framework 5 and code first entities?
如何避免迁移模型首先数据库实体框架5和代码第一实体吗?
How to avoid migrations in model first database with Entity Framework 5 and code first entities?
如何避免迁移模型首先数据库实体框架5和代码第一实体吗?
应用推荐