如何模拟OptimisticConcurrencyException

Question

我希望通过以下代码在EF中创建OptimisticConcurrencyException;但它不会导致异常！

   int device101 = SqlAggregateTestData.DeviceId101;
        IfaEntities context1 = new IfaEntities();
        IfaEntities context2 = new IfaEntities();


        var device1 = context1.Devices.Find(device101);
        context1.Entry(device1).State=EntityState.Modified;
        device1.Name = "sss";

        var device2 = context2.Devices.Find(device101);
        context2.Entry(device2).State=EntityState.Modified;
        device2.Name = "ss22222s";

        context2.SaveChanges();
        context1.SaveChanges();

我希望这可以针对OptimisticConcurrencyException测试我的EF代码库。