得到它的一个小技巧：

  db.Users.Attach（user）; 
 var current = db.Entry（user）.CurrentValues.Clone（）; 
 db.Entry（user）.Reload（）; 
 //你的用户（从db）的东西
 db.Entry（user）.CurrentValues.SetValues（current）; 
 db.Entry（user）.State = EntityState.Modified; 
 db.SaveChanges（）; 
 

I have a small ASP.Net mvc3 application and I am on the edit part. I have the default template:

public ActionResult Edit(int id)
{
    User user = db.Users.Find(id); 
    return View(user);
}

public ActionResult Edit(User user)
{
    //(Here access to old user name for example)
    db.Entry(user).State = EntityState.Modified;
    db.SaveChanges();
}

If i do user.name I have the new value but I want to access the db value before the save.

Thanks !

I got it work with a small trick:

db.Users.Attach(user);
var current = db.Entry(user).CurrentValues.Clone();
db.Entry(user).Reload();
//Do you user(from db) stuff
db.Entry(user).CurrentValues.SetValues(current);
db.Entry(user).State = EntityState.Modified;
db.SaveChanges();