transactions - 如何在asp.net-core 2.0中进行交易？

Question

我想更新一些值，但万一失败，我需要回滚。如何在 asp.net-core-2.0 中执行此操作？

我还没有找到任何答案。这是因为还不支持吗？在这种情况下，有哪些替代方案？

Answer 1

//--INSIDE YOUR SAVE METHOD--

using (var context = new YOURContext())
{
    using (var transaction = context.Database.BeginTransaction()) //--Startind transactions
    {
        try
        {
            context.YourObject1.Add(new YourObject1 { Url = "http://blogs.msdn.com/dotnet" });
            context.SaveChanges();

            context.YourObject2.Add(new YourObject2 { Url = "http://blogs.msdn.com/visualstudio" });
            context.SaveChanges();

            // Commit transaction if all commands succeed, transaction will auto-rollback
            // when disposed if either commands fails
            transaction.Commit();
        }
        catch (Exception)
        {
            // TODO: Handle failure
        }
    }
}

注意更新，首先恢复对象，然后更新。

//--INSIDE YOU UPDATE METHOD--
...
            if (ModelState.IsValid)
            {
                using (var transaction = _context.Database.BeginTransaction())
                {
                    try
                    {
                        var dataYourObj1 = await _context.YourObj1.SingleAsync(x => x.Id == YourObj1.Id);

                        dataYourObj1.Name = obj1.Name;
                        dataYourObj1.Email = obj1.Email;
                        await _context.SaveChangesAsync();

                        var dataYourObj2 = await _context.YourObj2.SingleAsync(x => x.Id == dataYourObj2.Id);
                        dataYourObj2.field = obj2.Field;
                        await _context.SaveChangesAsync();

                        transaction.Commit();
                    }
                    catch (Exception ex)
                    {
                        transaction.Rollback();
                        Console.WriteLine("Error occurred." + ex);
                    }
                    return RedirectToAction(nameof(Index));
                }
            }