代码第一：数据库是否在执行某些代码后创建？ [英] Code first: Database only created after execute certain code?

问题描述

我想先使用代码创建一个数据库。
我的数据库始终处于DropCreateDatabaseAlways模式。

I want to create a database using code first. And my database is always in "DropCreateDatabaseAlways" mode.

我注意到，如果我不尝试对数据库执行一些查询，例如

I notice that, if I don't try to execute some query against the database, such as

using (var db = new Models.TnHContext())
        {
            var query = from u in db.Users
                        select u;
            foreach (var u in query)
            {
                txt += u.UserID + "<br/>";
            }
        }

不会创建数据库。除非我执行它，否则只能看到创建的数据库。想知道这是否是由于EntityFramework设计/默认行为？

the database won't be created. Unless I execute it, only I can see the database created. Wonder if this is due to EntityFramework design/default behavior?

推荐答案

数据库初始化程序在对上下文执行查询时被调用，检索 ObjectContext 从 DbContext ，或者调用 Database.Initialize 方法。

The database initializer is called when you execute a query against the context, retrieve the ObjectContext from the DbContext, or call the Database.Initialize method.

因此，如果要立即创建数据库而不执行查询，则应该使用：

Therefore, if you want to create the database immediately without executing a query, you should use:

context.Database.Initialize(false);

这篇关于代码第一：数据库是否在执行某些代码后创建？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！