Drop database if model changes in EF Core without migrations

There's currently no easy way to implement DropDatabseIfModelChanges in EFCore. EF6 worked by storing a snapshot of your model in the __MigrationHistory table and comparing it to the current model. No such information is stored by EnsureCreated in EFCore.

To mimic the behavior in EFCore, you could manually store a hash of the model whenever you create the database in EFCore, check the hash on startup, and drop and re-create the database if it has changed.

var currentHash = MyHashingFunction(db.Model);

if (db.GetService<IRelationalDatabaseCreator>().Exists()
    && !db.Set<ModelHash>().Any(mh => mh.Value == currentHash))
{
    // Drop if changed
    db.Database.EnsureDeleted();
}

if (db.Database.EnsureCreated())
{
    // Insert hash if created
    db.Add(new ModelHash { Value = currentHash });
    db.SaveChanges();
}