Question

Consider the following code.

var items = from i in context.Items
            select i;
var item = items.FirstOrDefault();
item.this = "that";
item.that = "this";

var items2 = from i in context.Items
             where i.this == "that"
             select i;
var data = items2.FirstOrDefault();

context.SaveChanges();

I’m trying to confirm that items2 will not include my modifications to item. In other words, items2‘s copy of item will not include the unsaved changes.

Answer 1

Have you tried it? =)

By default, your objects are being tracked and cached by the context, so that the objects in your second query actually do reflect changes in the first.

You may want to call context.Items.AsNoTracking() on the one of your two “items” to get the behavior you want.

Edit: Actually, this is a strange question. I just noticed that your items2 hasn’t even hit the database yet, since you haven’t called ToList() or FirstorDefault(). It remains an IQueryable that will hit the database after your code snippet and will therefore contain the changed value.

HOWEVER, if you call ToList() on items2, you’ll encounter the caching scenario I outlined above.