Entity Framework 6 - Does not create tables when enabling Migrations

问题

In my application I enable Code First Migrations with some migrations, Also I use SQL Server Compact for integration test.

When I run my tests, Entity Framework create an empty database and tries to run migration on that empty database and thrown The specified table does not exist.

Based on this report I think usage of Migration in Entity Framework 6 has changed.

I test all Database Initializer with Context.Database.Create(); but in all case tabale's never created.

回答1:

I don't know that this is EntityFramework's bug or not, but when I made rename the namespace of Migration Configuration class from default (Projectname/Migrations) to any none default name, migration works well.

回答2:

Context.Database.Create() will not execute migrations! It only creates empty db. To Update database from code to latest version you need to use DbMigrator.Update method:

var migrator = new DbMigrator(new MyMigrationsConfiguration());
migrator.Update();

Alternatively you might use MigrateDatabaseToLatestVersion

Database.SetInitializer(new MigrateDatabaseToLatestVersion<BlogContext, Configuration>());

It is described in details here: http://msdn.microsoft.com/en-us/data/jj591621.aspx#initializer

回答3:

It does happens when adding model and running add-migration command.

Here is the simplest cause of this issue:

Add a newly added model property into IdentityDbContex class.

Here are the steps:

1. create model
2. add property into IdentityDbContex class
3. run add-migration
4. update-database

来源：https://stackoverflow.com/questions/23578679/entity-framework-6-does-not-create-tables-when-enabling-migrations