Entity Framework Core Interview Question #103

What is the EF Core ChangeTracker?

Change Tracking, Updates, Transactions & Concurrency Mid-Level Intermediate

Quick Interview Answer

ChangeTracker provides access to information and operations for entities currently tracked by a DbContext. It can inspect entries, entity states, original/current values, tracked relationships, and change-detection behavior.

Detailed Explanation

It is useful for diagnostics, auditing, custom persistence workflows, and understanding what SaveChanges will process.

Business logic should generally not manipulate the change tracker unnecessarily; use it when persistence-level control is actually required.

Code Example

foreach (var entry in db.ChangeTracker.Entries())
{
    Console.WriteLine(
        $"{entry.Entity.GetType().Name}: {entry.State}");
}