Entity Framework – Bits of .NET

EF Core — Change Tracking Is a Hidden Performance Tax

ErcanOPAK — Sun, 28 Dec 2025 15:21:22 +0000

Tracking thousands of entities slows everything.

context.ChangeTracker.QueryTrackingBehavior = NoTracking;

Or per query:

.AsNoTracking()

ErcanOPAK — Thu, 04 Dec 2025 09:00:00 +0000

Calling ToList() too early forces premature execution.

// Bad
var items = db.Users.ToList().Where(...);

// Good
var items = db.Users.Where(...).ToList();

Let the database handle filtering and execution.

ErcanOPAK — Tue, 20 Jun 2023 09:23:59 +0000

Query syntax:

var count = (from t in context.MyTable
             where t.Id == @Id
             select t).Count();

Method syntax:

var count = context.MyTable
            .Where(t => t.Id == @Id)
            .Count()

Both generate the same SQL query.