EF6 Code First Migrations: migrating events - entity-framework

Question

I have a code-first scenario with migrations enabled, AutomaticMigrationsEnabled is disabled, and the DB initializer is set to MigrateDatabaseToLatestVersion. I'd like to "catch" Migration events for logging purposes.
I tried to do it in the Seed() but it's called every single run, regardless of whether the underlying database needs a migration to match the model or not.
Is there a proper way to do this?

Answer 1

Solution 1)
Check if you need migration:
var migrator = new DbMigrator(new DbMigrationsConfiguration());
// If any migration is required then Count will be greater than 0
// 0 means no migration required
if (migrator.GetPendingMigrations().Count() > 0)
{
// Fire your event here!
}
Soultion 2)
Use a logging decorator to log progress, in this use case you do not need the event.
public class MyLogger : System.Data.Entity.Migrations.Infrastructure.MigrationsLogger
{
public override void Info(string message)
{
// Short status messages come here
}
public override void Verbose(string message)
{
// The SQL text and other info comes here
}
public override void Warning(string message)
{
// Warnings and other bad messages come here
}
}
To migrate to latest version, you have to call it like that:
DbMigrator migrator = new DbMigrator(new MyConfiguration());
MigratorLoggingDecorator logger = new MigratorLoggingDecorator(migrator, new MyLogger());
// This line will call the migration + logging
logger.Update();
Extra info:
You can create your custom MigratorLoggingDecorator decroator like that:
MyMigratorLoggingDecorator: MigratorLoggingDecorator {
internal override Upgrade(IEnumerable<string> pendingMigrations, string targetMigrationId, string lastMigrationId)
{
// Fire your event here!
base.Upgrade(..)
}
..}