问SetTransactionHandler for ObjectContext

EN

public class MyDbConfiguration : DbConfiguration
{
    public MyDbConfiguration()
    {
        SetTransactionHandler(SqlProviderServices.ProviderInvariantName, 
            () => new CommitFailureHandler());
    }
}

public class TestContext : DbContext { }

static void Main(string[] args)
{
    // instantiate DbContext to initialize code based configuration
    using (var db = new TestContext()) { }

    using (var db = new TransactionHandlerDemoEntities()) {
        var handler = db.TransactionHandler; // should be CommitFailureHandler

        db.AddToDemoTable(new DemoTable { Name = "TestEntiry1" });
        db.SaveChanges();
    }
}

static void Main(string[] args)
{
    DbConfiguration.Loaded += DbConfiguration_Loaded;

    using (var db = new TransactionHandlerDemoEntities()) {
        var handler = db.TransactionHandler;

        db.AddToDemoTable(new DemoTable { Name = "TestEntiry1" });
        db.SaveChanges();
    }
}

static void DbConfiguration_Loaded(object sender, DbConfigurationLoadedEventArgs e)
{
    e.AddDependencyResolver(new TransactionHandlerResolver(
        () => new CommitFailureHandler(),
        SqlProviderServices.ProviderInvariantName,
        null),true);
}