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Tag: ef-core

32 posts · Page 1 of 4

2026-06-15 comparison ef-core ef-core-11

AsNoTracking vs AsNoTrackingWithIdentityResolution in EF Core 11: which should you use?

Use AsNoTracking for read-only queries by default. Reach for AsNoTrackingWithIdentityResolution only when the result graph contains the same entity more than once and your code depends on getting a single shared instance back.

2026-06-14 dotnet dotnet-11 ef-core

EF Core 11's New EF1004 Analyzer Catches a Silent Async Mistake

EF Core 11 Preview 5 ships the EF1004 analyzer. It flags ToAsyncEnumerable() on an IQueryable so you do not accidentally enumerate a database query synchronously inside an await foreach.

2026-06-12 errors csharp dotnet

Fix: The entity type 'X' requires a primary key to be defined in EF Core 11

EF Core can't find a key for your type. Either name a property Id or {Type}Id, add [Key], call HasKey, or - if it is a view or raw SQL result - call HasNoKey.

2026-06-10 errors csharp dotnet

Fix: The configured execution strategy 'SqlServerRetryingExecutionStrategy' does not support user-initiated transactions

EnableRetryOnFailure conflicts with BeginTransaction. Wrap the whole transaction in db.Database.CreateExecutionStrategy().ExecuteAsync(...) so it retries as one unit.

2026-06-04 comparison ef-core ef-core-11

EF Core ExecuteUpdate vs loading entities and SaveChanges: which should you use?

A decision guide and real benchmark for EF Core 11: use ExecuteUpdate for set-based writes by a predicate, and the load-then-SaveChanges path only when you need the change tracker, interceptors, or a complex object graph.

2026-06-04 migration ef-core ef-core-6

Migrate EF Core 6 to EF Core 11: breaking changes that actually bite

A version-pinned migration guide from EF Core 6.0 to EF Core 11.0, walking the breaking changes across EF7, 8, 9, 10, and 11 that break real apps: Encrypt=True, OPENJSON Contains, PendingModelChangesWarning, the native json column, and the SqlClient 7.0 split.

2026-06-02 errors csharp dotnet

Fix: ObjectDisposedException: Cannot access a disposed context instance

Your fire-and-forget task captured a request-scoped DbContext that the DI scope already disposed. Resolve a fresh context inside the task with IServiceScopeFactory or IDbContextFactory.

2026-06-01 ef-core dotnet-11 dotnet-cli

EF Core 11 Preview 4: Stop Retyping --project and --startup-project with .config/dotnet-ef.json

EF Core 11 Preview 4 lets the dotnet ef tool read default option values from a .config/dotnet-ef.json file, so split solutions no longer force you to pass --project and --startup-project on every command.

2026-06-01 ef-core ef-core-11 csharp

How to use query splitting to avoid a cartesian explosion in EF Core 11

When you Include two sibling collections, EF Core 11 returns the cross product and your row count explodes. Here is how AsSplitQuery fixes it, how to turn it on globally, and the consistency and ordering gotchas to watch for.

2026-05-31 ef-core ef-core-11 csharp

How to use ExecuteUpdate and ExecuteDelete for bulk writes in EF Core 11

A complete guide to ExecuteUpdate and ExecuteDelete in EF Core 11: the SQL they emit, the change-tracker gotcha that silently overwrites your bulk write, transactions, concurrency control with the affected-row count, and the EF Core 10 delegate setters that let you build conditional updates with plain if statements.