Question

In my database, I have a single item that I want to update. I tried doing something like this, but it doesn’t work:

db.Items.Where(t => t.Id == itemId).Select(t =>
            {
                t.CurrentValue = 99;
                t.TotalValue = 999;
            });

What works is this code, but I think that this is inefficient (am I wrong?):

db.Items.Single(t => t.Id == itemId).TotalValue = 999;
db.Items.Single(t => t.Id == itemId).CurrentValue = 99;
db.SaveChanges();

Is there a way to update different properties of a single object, with a single query?

Answer 1

You are correct, running db.Items.Single(...) multiple times may be suboptimal.

Calling it once and then referencing its properties should be more efficient:

var item = db.Items.Single(t => t.Id == itemId);
item.TotalValue = 999;
item.CurrentValue = 99;
db.SaveChanges();