Question

我有两个独立的（没有关系）实体。这些的一些属性改变了，然后我调用SaveChanges。我需要将两个更新都包装到一个事务中，因为它们构成了我的应用程序状态。

执行两个更新，如SQL事件探查器中所示。但我看不到任何交易。为什么EF4不围绕2次更新创建交易？我怎样才能做到这一点？（我已经尝试过transactioncope，但在Profiler中看不到任何交易）

任何想法？

Answer 1

这应该有效，但你需要按照正确的顺序做事。

这是一些sudo代码：

using (TransactionScope scope = new TransactionScope()) 
{ 
    //Do something with context1 
    //Do something with context2 

    //Save Changes but don't discard yet 
    context1.SaveChanges(false); 

    //Save Changes but don't discard yet 
    context2.SaveChanges(false); 

    //if we get here things are looking good. 
    scope.Complete(); 

    //If we get here it is save to accept all changes. 
    context1.AcceptAllChanges(); 
    context2.AcceptAllChanges(); 

}

如果您在发布代码时仍有问题。

Answer 2

嘿，即使我不写接受所有更改，我的记录也会保存

using (TransactionScope scope = new TransactionScope())
{
    Roll rsr = new Roll();
    rsr.RoleName = "krians";
    studentEntities.Rolls.AddObject(rsr);

    Roll rsssddr = new Roll();
    rsssddr.RoleName = "kriansss";
    studentEntities1.Rolls.AddObject(rsssddr);

    //Do something with context1 
    //Do something with context2 
    var sdfsf = studentEntities.ObjectStateManager;

    //Save Changes but don't discard yet 
    studentEntities.SaveChanges(false);

    var sdfssdfdsff = studentEntities.ObjectStateManager;
    var sdsdfdsffsf = studentEntities1.ObjectStateManager;

    //Save Changes but don't discard yet 
    studentEntities1.SaveChanges(false);

    var sdsdfdsffsasdfasdff = studentEntities1.ObjectStateManager;

    //if we get here things are looking good. 
    scope.Complete();

    var sdfsf3 = studentEntities.ObjectStateManager;
    var sdfsfasdfasdf3 = studentEntities1.ObjectStateManager;
    //If we get here it is save to accept all changes. 
    //studentEntities.AcceptAllChanges();
    //studentEntities1.AcceptAllChanges();
}

EF4如何在事务中包装2个更新

2 个答案: