在实体框架中异常更新数据库中的所有记录

Question

I have this weird issue with Entity Framework with the code snippet below

var userWorkItems = (from uw in context.UserWorkItems
                     join u in context.DNN_Users on uw.UserID equals u.UserID
                     where u.Username.StartsWith(fromUserName)
                     select uw).ToList();

if (userWorkItems != null)
{
    for (int i = 0; i < userWorkItems.Count; i++)
    {
        userWorkItems[i].UserID = toUserID.Value;
    }

    context.SubmitChanges();
}

The whole table gets updated with the Userid of the fromUserName when an exception occurs.

What kind of exception leads to this kind of weird behavior, though a try catch has been added now to the context.SubmitChanges();

Or are we making the wrong conclusion?

Answer 1

Where does the exception occur and what is the exception? I believe your issue might be fromUserName . If it was an empty string, it would return every single UserWorkItem . If an error is thrown and you don't want it to do a partial save on the context, wrap it in a TransactionScope like so.

using(var scope = new TransactionScope()){
    //Do whatever
    scope.Complete();
}