public async Task DownAsync()
{
if (!_project.IsDatabaseInitialized)
{
throw new InvalidOperationException("Cannot undo migration: database connection has not been initialized");
}
await Task.Run(() =>
{
try
{
var context = _migrationsRepository.GetRunnerContext(_project.Profile, Tags, false);
using (var processor = _migrationsRepository.GetMigrationProcessor(_project.DatabaseType.Value, _project.ConnectionString, context))
{
var runner = new MigrationRunner(_project.MigrationsAssembly, context, processor);
var migrations = runner.MigrationLoader.LoadMigrations();
var info = migrations.Single(m => m.Key == Version);
var sw = new Stopwatch();
sw.Start();
runner.ApplyMigrationDown(info.Value, true);
sw.Stop();
_log.Info("Successfully undone migration {0}: '{1}', took {2}", Version, Description, sw.Elapsed);
}
}
catch (Exception e)
{
throw new MigrationException("Could not undo migration", e, this);
}
});
}