测试代码：

int i = 10;int xx = 20;List
     
       lst = null;Action doSth = () =>{    using (var db = new TestSystemEntities())    {        var f = db.ABC.ToList();        f.ForEach(x => x.C = "TestTransactionScope");        db.SaveChanges();    }    new Task(() =>    {        using (var db = new TestSystemEntities())        {            var f = db.ABC.ToList();            f.ForEach(x => x.C = "AsyncTestTransactionScope");            db.SaveChanges();        }    }).Start();    i = 20;    lst.Insert(0, "xx");    xx = 100;};try{    TransactionOptions tr = new TransactionOptions()    {        IsolationLevel = IsolationLevel.Serializable,        Timeout = TransactionManager.MaximumTimeout    };    using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required, tr))    {        doSth();        scope.Complete();    }}catch (Exception ex){    Console.WriteLine("exception happens");}Console.WriteLine("i: {0}, xx: {1}", i, xx);
     

上面的代码，由于lst一直为null，当执行到lst.Insert的时候，会出现异常，触发事务回滚。

测试结论：回滚效果，同步SQL里面的操作回滚了，但内存中的object并未回滚，异步的SQL里面也未回滚.

如图：