12.0.0

Issues

• Cosmos: make complex types the default (instead of owned)

  area-cosmosarea-model-building
  Task

  dotnet/efcore#37954 · Filter by author roji opened on Mar 19, 2026 · 12.0.0
  

• Support C# union mapping to JSON

  area-jsonarea-o/c-mapping
  Feature

  dotnet/efcore#38059 · Filter by author AndriySvyryd opened on Apr 7, 2026 · 12.0.0
  1

  

• Switch to non-generated materialization

  area-aotarea-queryconsider-for-next-release
  Feature

  dotnet/efcore#38310 · Filter by author roji opened on May 22, 2026 · 12.0.0
  

• Rearchitect navigation expansion to happen in translation, not preprocessing

  area-query
  Task

  dotnet/efcore#37859 · Filter by author roji opened on Mar 5, 2026 · 12.0.0
  1

  

• EF8 - Regression on Contains query when column collation is not default DB collation

  area-primitive-collectionsarea-queryconsider-for-next-releasecustomer-reportedregression
  Bug

  dotnet/efcore#32147 · Filter by author clement911 opened on Oct 24, 2023 · 12.0.0
  43

  

• Can no longer client-evaluate query with projection involving non-primitive list

  area-queryregression
  Bug

  dotnet/efcore#32634 · Filter by author roji opened on Dec 18, 2023 · 12.0.0
  

• Sql Server - LINQ Contains returns false positive results for string values larger than column size

  area-primitive-collectionsarea-querycustomer-reportedregression
  Bug

  dotnet/efcore#32735 · Filter by author sergeitemkin opened on Jan 5, 2024 · 12.0.0
  5

  

• EF8 core: filtering by enum doesn't work with TPH and OfType

  area-querycustomer-reportedregression
  Bug

  dotnet/efcore#32865 · Filter by author karczk-dnv opened on Jan 19, 2024 · 12.0.0
  2

  

• Concat on string property Error

  area-primitive-collectionsarea-querycustomer-reportedregression
  Bug

  dotnet/efcore#33061 · Filter by author GLuca74 opened on Feb 11, 2024 · 12.0.0
  2

  

• Query optimization compares case sensitively while SqlServer is case insensitive?

  area-queryconsider-for-next-releasecustomer-reportedregression
  Bug

  dotnet/efcore#34862 · Filter by author kopfsick opened on Oct 9, 2024 · 12.0.0
  2

  

• Cosmos SQL query enum array (Contains) to string conversion not working properly

  area-cosmosarea-querycustomer-reportedregression
  Bug

  dotnet/efcore#35092 · Filter by author Kevenvz opened on Nov 13, 2024 · 12.0.0
  4

  

• NAOT; error when trying to run precompile queries step - "The build host could not be found"

  area-precompiled-queriesarea-toolsregression
  Bug

  dotnet/efcore#36055 · Filter by author maumar opened on May 8, 2025 · 12.0.0
  

• [10 Regression] ExecuteUpdate no longer works within compiled queries

  area-bulkupdatearea-querycustomer-reportedregression
  Bug

  dotnet/efcore#36741 · Filter by author Atulin opened on Sep 10, 2025 · 12.0.0
  4

  

• The SQL logged by EF doesn't reflect changes made by interceptors

  area-interceptionarea-loggingarea-querycustomer-reportedneeds-designregression
  Bug

  dotnet/efcore#37236 · Filter by author ken-swyfft opened on Nov 25, 2025 · 12.0.0
  6

  

• Read-only property requires explicit ignore when type is derived from NetTopologySuite.Geometries.GeometryCollection

  area-model-buildingcustomer-reportedregression
  Bug

  dotnet/efcore#37263 · Filter by author palhal opened on Nov 30, 2025 · 12.0.0
  3

  

• EFCore.Tasks: Don't use --nativeaot when the build isn't using PublishAOT=true

  area-aotarea-toolscustomer-reported
  Feature

  dotnet/efcore#34473 · Filter by author AndriySvyryd opened on Aug 19, 2024 · 12.0.0
  1

  

• AOT: Add support for private types

  area-aotarea-model-building
  Feature

  dotnet/efcore#35985 · Filter by author AndriySvyryd opened on Apr 23, 2025 · 12.0.0
  

• Remove MakeGenericMethod from the query hot path

  area-aotarea-perfarea-query
  Feature

  dotnet/efcore#27437 · Filter by author roji opened on Feb 14, 2022 · 12.0.0
  1

  

• Query translation fails when Where references a projection guarded by child != null && grandChild != null

  area-querycustomer-reported
  Bug

  dotnet/efcore#38565 · Filter by author aheubusch opened on Jul 7, 2026 · 12.0.0
  1

  

• Cosmos: equality on a hierarchical partition-key prefix is lifted out of WHERE into the partition hint, forgoing the index and scanning the physical partition

  area-cosmosarea-querycustomer-reported
  Bug

  dotnet/efcore#38598 · Filter by author vitorlinares opened on Jul 9, 2026 · 12.0.0
  4

  

• SQL Server: allow using float[], ReadOnlyMemory<float> and similar instead of SqlVector<float> to represent embeddings

  area-queryarea-sqlserverarea-vector-search
  Feature

  dotnet/efcore#37025 · Filter by author roji opened on Oct 24, 2025 · 12.0.0
  1

  

• Cosmos: Allow partial updates

  area-cosmosarea-save-changes
  Feature

  dotnet/efcore#13559 · Filter by author AndriySvyryd opened on Oct 9, 2018 · 12.0.0
  20

  

• Query: Re-evaluate concept of pending selector in nav expansion

  area-perfarea-queryneeds-design
  Feature

  dotnet/efcore#20291 · Filter by author smitpatel opened on Mar 15, 2020 · 12.0.0
  3

• Consider removing nav expansion as a way to tackle the pending selector problem

  area-queryconsider-for-next-releaseneeds-design
  Feature

  dotnet/efcore#32957 · Filter by author maumar opened on Jan 30, 2024 · 12.0.0
  6

  

• Shaper discards null checks

  area-querycustomer-reported
  Bug

  dotnet/efcore#38762 · Filter by author klightspeed opened on Aug 7, 2026 · 12.0.0
  1