如何在EntityFramework 5中使用Transaction？

Question

我想同时转换一些表.如果一个人不成功,必须全部回滚.

像这样的东西:

ctx.Database.ExecuteSqlCommand("truncate table tb_expensesall");
ctx.Database.ExecuteSqlCommand("truncate table tb_wholesale");
ctx.Database.ExecuteSqlCommand("truncate table tb_singlesale");
ctx.Database.ExecuteSqlCommand("truncate table tb_purchase");

但问题是,我不知道如何使用交易.

我试着这个:

using (gasstationEntities ctx = new gasstationEntities(Resources.CONS))
{
    ctx.Database.Connection.Open();
    DbTransaction tr = ctx.Database.Connection.BeginTransaction();

    try
    {
        ctx.Database.ExecuteSqlCommand("truncate table tb_expensesall");
        ctx.Database.ExecuteSqlCommand("truncate table tb_wholesale");
        ctx.Database.ExecuteSqlCommand("truncate table tb_singlesale");
        ctx.Database.ExecuteSqlCommand("truncate table tb_purchase");
        //commit the transaction
        tr.Commit();
        new MessageWindow(this, Resources.GetString("Warn"), Resources.GetString("DeleteSuccess"));
    }
    catch (Exception ex)
    {
        //return
        tr.Rollback();
    }
    //close
    ctx.Database.Connection.Close();
}

这里的问题: tr.Commit(); 和Exception告诉我:

{System.InvalidOperationException: Connection must be valid and open to rollback transaction

而tr.Rollback();抛出异常.例外是:

{System.InvalidOperationException: Connection must be valid and open to rollback transaction

真正有趣的是,表截断是成功的.什么？提交是抛出异常.它可以成功吗？我无法理解.

请告诉我什么是goning.如果你给我一个解决方案,那就更好了.

Answer 1

尝试封装您的代码

using (gasstationEntities ctx = new gasstationEntities(Resources.CONS))
{
   using (var scope = new TransactionScope())
   {
      [... your code...]

      scope.Complete();
   }
}

如果发生异常,则不会调用scope.Complete()并且回滚是自动的.

编辑:我刚看到你的MySql标签.如果这不起作用,请看看这里!