Expose StateManager.TryGetEntry in DbContext.ChangeTracker

[jamezamm]

From DbContext.ChangeTracker, the only way to find a tracked entity by its primary key is to iterate over ChangeTracker.Entries().

Since this is not efficient, I propose exposing StateManager.TryGetEntry in DbContext.ChangeTracker (Ex: ChangeTracker.FindEntry). DbSet().Find() already employs this method to locate a tracked entity by key.

Hopefully this won't be too much effort because StateManager is already utilized in the ChangeTracker class, like StateManager.Entries().

[ErikEJ]

Is that not already implemented?
https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-8.0/whatsnew#lookup-tracked-entities-by-primary-alternate-or-foreign-key

[jamezamm]

Since a bug (which should be fixed by 8.0.2) is preventing me from switching to EF8, I did not realise this had been implemented on DbSet().Local.

Has this been implemented on DbContext.ChangeTracker?

[ajcvickers]

Duplicate of #29685

[jamezamm]

In my case I am working with an object that can be of any type, thus I do not know the specific type at design time.

Although DbSet().Local.FindEntry is a good feature, I would still have to access it via reflection.

For that reason I suggested to include StateManager.TryGetEntry (as FindEntry) in DbContext.ChangeTracker.

In my opinion, this is an enhancement to #29685 rather than a duplicate.

[ajcvickers]

@jamezamm Non-generic access is covered by #21066.