为什么 TransactionScope 不适用于实体框架?

问题描述

请看下面的代码.如果我初始化多个实体上下文，那么我会在 仅第二组代码 上得到以下异常.如果我注释掉第二组就可以了.

See the code below. If I initialize more than one entity context, then I get the following exception on the 2nd set of code only. If I comment out the second set it works.

{"底层提供程序在打开时失败."}

{"The underlying provider failed on Open."}

内部:{与底层事务管理器的通信失败."}

Inner: {"Communication with the underlying transaction manager has failed."}

内部:{错误 HRESULT E_FAIL 已从对 COM 组件的调用返回."}

Inner: {"Error HRESULT E_FAIL has been returned from a call to a COM component."}

请注意，这是一个示例应用程序，我知道连续创建 2 个上下文没有意义.但是，生产代码确实有理由在同一个 TransactionScope 中创建多个上下文，并且这是无法更改的.

Note that this is a sample app and I know it doesn't make sense to create 2 contexts in a row. However, the production code does have reason to create multiple contexts in the same TransactionScope, and this cannot be changed.

编辑

这是我之前尝试设置 MS-DTC 的一个问题.它似乎在服务器和客户端上都启用了.我不确定它是否设置正确.另请注意，我尝试这样做的原因之一是 TransactionScope 中的现有代码使用 ADO.NET 和 Linq 2 Sql...我希望它们也使用相同的事务.(这听起来可能很疯狂，但如果可能的话，我需要让它发挥作用).

Here is a previous question of me trying to set up MS-DTC. It seems to be enabled on both the server and the client. I'm not sure if it is set up correctly. Also note that one of the reasons I am trying to do this, is that existing code within the TransactionScope uses ADO.NET and Linq 2 Sql... I would like those to use the same transaction also. (That probably sounds crazy, but I need to make it work if possible).

如何在 C# 中使用 TransactionScope?

解决方案

Windows 防火墙阻止了与 MS-DTC 的连接.

using(TransactionScope ts = new System.Transactions.TransactionScope())
        {
                using (DatabaseEntityModel o = new DatabaseEntityModel())
                {
                    var v = (from s in o.Advertiser select s).First();
                    v.AcceptableLength = 1;
                    o.SaveChanges();
                }

                //-> By commenting out this section, it works
                using (DatabaseEntityModel o = new DatabaseEntityModel())
                {
                    //Exception on this next line
                    var v = (from s1 in o.Advertiser select s1).First();                         v.AcceptableLength = 1;
                    o.SaveChanges();
                }
                //->

                ts.Complete();
        }

推荐答案

由于某种原因，您的 MS-DTC(分布式事务协调器)无法正常工作.MS-DTC用于协调跨多个异构资源的事务结果，包括多个sql连接.

Your MS-DTC (Distributed transaction co-ordinator) is not working properly for some reason. MS-DTC is used to co-ordinate the results of transactions across multiple heterogeneous resources, including multiple sql connections.

看看此链接了解有关正在发生的事情的更多信息.

Take a look at this link for more info on what is happening.

基本上，如果您确保 MS-DTC 正在运行并且正常工作，那么使用 2 个 ADO.NET 连接应该没有问题 - 无论它们是实体框架连接还是任何其他类型.

Basically if you make sure your MS-DTC is running and working properly you should have no problems with using 2 ADO.NET connections - whether they are entity framework connections or any other type.

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