Entity Framework SaveChanges does not save data

问题

using (var db = new dbEntities())
{
    var dbUser = (from u in db.Users
                  where u.Id == Id
                  select u).First();

    dbUser.LastName = LastName;
    dbUser.FirstName = FirstName;
    dbUser.GroupId  = GroupId;
    dbUser.VoicesCount = VoicesCount;

    db.SaveChanges();
 }

This does not save any changes to the database. But there are no exceptions, either. Why?

UPD: Ok, I tried it also for SQL Server CE and nothing changes. It doesn't save the changed data.

回答1:

Look in you bin/debug folder for a copy of the database, it will have the changed data, as you are including the database a content with your app

来源：https://stackoverflow.com/questions/10772713/entity-framework-savechanges-does-not-save-data