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EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.

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Preserve `null` instead of creating an empty collection. Prioritize this for complex collections, but also consider owned collections.

area-change-tracking
area-json

`ReplaceService` does not work for this

area-dbcontext

It will be similar to `IModelCustomizer`: ```C# public interface IConventionCustomizer { /// /// Sets model defaults and configures conventions before they run for a given context. /// /// /// If...

area-model-building

### What problem are you trying to solve? My code example: ```C# using Microsoft.EntityFrameworkCore; using Microsoft.Extensions.Logging; using Npgsql; using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; namespace EfInvalidSql; public class...

area-perf
customer-reported
area-query

### Bug description A `SelectMany` which flattens a collection conditionally on a given source cannot be translated. [EF Playground](https://efplayground.io/s/peach-buzzard-17cb3e7b) ### Your code ```csharp class Customer { public int Id {...

customer-reported

### What problem are you trying to solve? I would like to have value type support. Try this code sample below. Currently you get this Unhandled exception. `System.ArgumentException: The specified...

customer-reported
area-query

Vector embeddings information is currently missing so the database with vectors is not correctly set up when running tests against live service, rather than the emulator.

area-test
area-cosmos

To use some ancient EF4 terminology, today's EF Core query behavior uses `MergeOptions.AppendOnly`. This means that new entities are materialized and attached to the state manager while any entities that...

area-change-tracking

To repro delete all (multiline) baselines in a file and run the rewriter.

area-test