Entity Framework的事务提交

一组业务整体处理的行为叫一个事务。这一组的业务都能成功处理，我们就可以把这个事务提交来保存你已做的行为结果。事物的Commit是执行了你的方法进行了数据库的提交，之前的sava都是放在缓存中并没有执行到数据库。

• 1. 使用TransactionScope

这个写法最像ado.net的事务提交。需要引用System.Transactions命名空间。

var invoiceDetailOriginal = InvoiceDetailService.Query(m => m.DetailID == 86).FirstOrDefault();
            using (TransactionScope transaction = new TransactionScope())
            {
                try
                {
                    List<BL_Invoice> invoiceLst = new List<BL_Invoice>();
                    List<BL_InvoiceDetail> detailLst = new List<BL_InvoiceDetail>();
                    var lst = InvoiceService.Query(m => m.ID > 49).ToList();
                    for (int n = 0; n < 3; n++)
                    {
                        BL_Invoice i = new BL_Invoice()
                        {
                            IsWD = lst[n].IsWD,
                            IsAzure = lst[n].IsAzure,
                            InvoiceNumber = lst[n].InvoiceNumber,
                            InvoiceDate = DateTime.Now,
                            BITTYPE = lst[n].BITTYPE,
                            BPexternalID = lst[n].BPexternalID,
                            CAexternalID = lst[n].CAexternalID,
                            Amount = lst[n].Amount,
                            IsMETHODSynced = false,
                            METHOD_INCC = (n == 1) ? "XXXX" : "P",
                            CreatedDate = DateTime.Now
                        };

                        BL_InvoiceDetail d = new BL_InvoiceDetail()
                        {
                            BL_Invoice = i,
                            BITREF32 = invoiceDetailOriginal.BITREF32,
                            MSSKU = (n == 1) ? "存二十个汉字；存二十个汉字；存二十个汉字；存二十个汉字；存二十个汉字。" : invoiceDetailOriginal.MSSKU,
                            Amount = invoiceDetailOriginal.Amount,
                            Tax = invoiceDetailOriginal.Tax,
                            DeferralAmount = invoiceDetailOriginal.DeferralAmount,
                            BITDATE_FROM = invoiceDetailOriginal.BITDATE_FROM,
                            BITDATE_TO = invoiceDetailOriginal.BITDATE_TO,
                            CreatedDate = DateTime.Now
                        };
                        InvoiceService.Add(i);
                        InvoiceDetailService.Add(d);     //到这一步出错，然后看添加invoice也没有添加上。 这就是事务的作用。当然entity的savaChangge() 也可以看做是一个事务。
                        transaction.Complete();
                    }
                }
                catch (Exception ex)
                {
                    throw ex;
                }
                finally
                {
                    transaction.Dispose();
                }

•  2. SaveChangges() 和UnitOfWork.Commit()

插入一两个相关的list。list中有一条出错，整个事务回滚。利用的 reponsitory的 IUnitOfWork。

List<BL_Invoice> invoiceLst = new List<BL_Invoice>();
            List<BL_InvoiceDetail> detailLst = new List<BL_InvoiceDetail>();
            var lst = InvoiceService.Query(m => m.ID > 49).ToList();
            for (int n = 0; n < lst.Count();n++)
            {
                BL_Invoice i = new BL_Invoice()
                {
                    IsWD = lst[n].IsWD,
                    IsAzure = lst[n].IsAzure,
                    InvoiceNumber = lst[n].InvoiceNumber,
                    InvoiceDate = DateTime.Now,
                    BITTYPE = lst[n].BITTYPE,
                    BPexternalID = lst[n].BPexternalID,
                    CAexternalID = lst[n].CAexternalID,
                    Amount = lst[n].Amount,
                    IsMETHODSynced = false,
                    METHOD_INCC =(n==1)?"XXX":"P",
                    CreatedDate = DateTime.Now
                };
                invoiceLst.Add(i);
                var invoiceDetailOriginal = InvoiceDetailService.Query(m => m.DetailID == 86).FirstOrDefault();//lst[n].BL_InvoiceDetail.FirstOrDefault();
                BL_InvoiceDetail d = new BL_InvoiceDetail()
                {
                    BL_Invoice = i,
                    BITREF32 = invoiceDetailOriginal.BITREF32,
                    MSSKU = (n == 1) ? "存二十个汉字；存二十个汉字；存二十个汉字；存二十个汉字；存二十个汉字。" : invoiceDetailOriginal.MSSKU,
                    Amount = invoiceDetailOriginal.Amount,
                    Tax = invoiceDetailOriginal.Tax,
                    DeferralAmount = invoiceDetailOriginal.DeferralAmount,
                    BITDATE_FROM = invoiceDetailOriginal.BITDATE_FROM,
                    BITDATE_TO = invoiceDetailOriginal.BITDATE_TO,
                    CreatedDate = DateTime.Now
                };
                detailLst.Add(d);
            }
            InvoiceService.AddRange(invoiceLst, detailLst);

总体来说Entity Framework中的数据库操作无不体现着事务的关联性，毕竟这也是合理的要求。比ado.net中操作简单方便。