EF - Update multiple rows in database without using foreach loop

Question

My test code:

using (var db = new MyDbContext())
{
  string fromUser = \"\"; //sender
  string toUser = \"\"; //receiver

  var messages = db.Message.Where(x         


        

Answer 1

You don't need to SaveChanges() on each iteration. That will hit the database multiple times. Try:

using (var db = new MyDbContext())
{
  string fromUser = ""; //sender
  string toUser = ""; //receiver
  var messages = db.Message.Where(x => x.FromUser == fromUser && x.ToUser == toUser)
                 .ToList();
  messages.ForEach(m => m.IsRead = true);
  db.SaveChanges();
}