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change-tracking

Implementation details for EF Core change tracking. Use when changing InternalEntityEntry, ChangeDetector, SnapshotFactoryFactory, or related entity state, snapshot, or property accessor code.

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SKILL.md
Quality
Evals
Security

Change Tracking

Manages entity states and detects changes for SaveChanges().

Core Components

  • StateManager — central engine, identity maps, tracks all entities
  • InternalEntityEntry — per-entity state, property flags, snapshots
  • SnapshotFactoryFactory subclasses build snapshot factories for change detection
  • PropertyAccessorsFactory, ClrPropertyGetterFactory and ClrPropertySetterFactory compile property accessors for efficient snapshotting and change detection
    • Ordinals in indices parameter specify element at each complex collection depth

Testing

Unit tests: test/EFCore.Tests/ChangeTracking/. Functional tests: test/EFCore.Specification.Tests/GraphUpdates/.

Common Pitfalls

PitfallSolution
There is a failure when there is shared identity entry (Added and Deleted)Add code that checks SharedIdentityEntry

Validation

  • DetectChanges() identifies modified properties via snapshot comparison
  • Setting original values marks properties as modified or unchanged based on comparison with current values
Repository
dotnet/efcore
Path

.agents/skills/change-tracking/SKILL.md

Commit

61317c9

Last updated
First committed

Also appears in

dotnet/dotnet
In sync

since Jul 28, 2026

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