How to log Entity Framework 4.3 Beta 1 migrations

Question

I am just trying it out the new Code First migrations version. 

I am going the "magic" track most of the time, so I've found it really useful in previous version to add some logging such as:

new DbMigrator(.....);
dbMigrator.Update(MigratorEventHandler);
...
private void MigratorEventHandler(object sender, DbMigrationEventArgs e)
{
  _log.Info(string.Format("Migration event {0}", e.ToString()));
}

Where did this option go in the latest release?

Answer 1

Logging can be achieved by using the MigratorLoggingDecorator class.  For example

var dbMigrator = new MigratorLoggingDecorator(new DbMigrator(...), new MyLogger(_log));
dbMigrator.Update();
...
class MyLogger : MigrationsLogger
{
    ...
    public override void Info(string message)
    {
        _log.Info(string.Format("Migration event INFO: {0}", message);
    }
    ...
}

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Brice Lambson

Answer 2

Thanks, cool enough. Almost at the same time as you replied, I just figured the same, using reflector :-). Is there a more detailed list of API changes than what is present at the "What changed" section of the release page http://blogs.msdn.com/b/adonet/archive/2012/01/12/ef-4-3-beta-1-released.aspx?

Answer 3

The API you were using was actually changed back in Code First Migrations Alpha 2. You may want to check all of the What's Changed sections in the release posts:

• Code First Migrations: Alpha 2 Released
• Code First Migrations: Alpha 3 Released
• Code First Migrations: Beta 1 Released

 

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Brice Lambson