entity framework框架使用事务当中出现的奇怪问题

Question

 不知道大家有没有遇到过这种问题，比如我一开始某个字段太短了，第一次保存的时候会报错，然后回滚，接着我去数据库当中手动修改这个字段的长度，第二次保存可以成功，但是问题是，会把第一次失败的数据也一起保存进去，不知道如何解决，我一开始以为是我没有把连接关闭，但是后来加了也不可以，请大家帮我看一下，多谢！

      int flag = -1;
      if (this.DbEntity.Connection.State != System.Data.ConnectionState.Open)
      {
        this.DbEntity.Connection.Open();
      }
      var trans = this.DbEntity.Connection.BeginTransaction();
      try
      {
        //这里进行添加数据操作 begin

        BT_RAILROADDOC_OP newObject = new BT_RAILROADDOC_OP();
        newObject.RLOP_ID = Guid.NewGuid();
        newObject.RLOP_EXPECTED_AMOUT = obj.RLOP_EXPECTED_AMOUT;
        newObject.RLOP_EXPECTED_PACK = obj.RLOP_EXPECTED_PACK;
        newObject.RLOP_FROM = obj.RLOP_FROM;
        newObject.RLOP_INOUT_NUM = obj.RLOP_INOUT_NUM;
        newObject.RLOP_INPUT_DATE = obj.RLOP_INPUT_DATE;
        newObject.RLOP_INPUT_USERID = obj.RLOP_INPUT_USERID;
        newObject.RLOP_OPDATE = obj.RLOP_OPDATE;
        newObject.RLOP_OPDEPARTMENT_ID = obj.RLOP_OPDEPARTMENT_ID;
        newObject.RLOP_RLRD_ID = obj.RLOP_RLRD_ID;
        newObject.RLOP_TO = obj.RLOP_TO;
        this.DbEntity.AddToBT_RAILROADDOC_OP(newObject);
        //end

        this.DbEntity.SaveChanges();
        trans.Commit();
        flag = 0;
      }
      catch (Exception ex)
      {
        //比如我第一次保存失败，会回滚，数据库当中也不会添加数据，
        //但是比如我修改了一下数据，第二次可以正常保存数据，但是发现数据库当中会有两条相同的数据，也就是savechange的时候
        //把上一次失败时的数据也一起保存进去了
        trans.Rollback();
        throw ex;
      }
      finally
      {
        if (this.DbEntity.Connection.State != System.Data.ConnectionState.Closed)
        {
          this.DbEntity.Connection.Close();//一开始我以为是这里没有把连接关闭，后来加上也不可以
        }
      }
      return flag;

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crazyBasketball

Answer 1

ObjectContext会跟踪你所做的改动。你保存失败的话添加的数据仍旧处于已添加状态。

PS SaveChanges自动建立一个事务的。

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Answer 2

事务只会对你做的数据操作进行回滚  不会对你的内存操作做回滚

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成为 Microsoft V Dash了。。。 欢迎各位前辈同事在OCS加我

Answer 3

 那没有解决的办法了吗？

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crazyBasketball

Answer 4

你是说savechange这个方法本身就会自己创建一个事务吗？

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crazyBasketball

Answer 5

是啊，所以你只有一个savechange的话没有必要自己创建事务的。

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Answer 6

那版主我这个问题有没有解决的方案呢，就是回滚之后，内存当中的数据还在

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crazyBasketball

Answer 7

参考How to reset change tracking (ObjectStateManager)

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