[jksware]

The proposed changes solve the parameter capture issue (an IParameterSymbol case was missing) when trying to precompile queries.

This solves the following error:

System.InvalidOperationException: Dynamic LINQ queries are not supported when precompiling queries

when trying to compile:

static async Task<List<Blog>> GetBlogsById(PrecompiledQueryContext parameterContext, int id)
    => await parameterContext.Blogs.Where(b => b.Id == id).ToListAsync();

due to parameters parameterContext and id not being recognized as valid captured symbols.

I've added some unit tests to account for regular argument capturing and DbContext capturing from a parameter symbol.

Fixes #35887

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        Summary of the changes
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        Fixes #bugnumber

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[jksware]

@dotnet-policy-service agree

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused implementation covers both missing symbol paths with end-to-end regression tests and matching SQL assertions.

Review effort: Balanced
Findings: None

What changed in this PR

Fixes precompiled query discovery and translation for method parameters, including DbContext parameters and values captured by query lambdas.

Changes:

• Recognizes parameter symbols during query discovery and LINQ translation.
• Adds relational coverage and SQL Server baselines for both scenarios.

File	Description
src/​EFCore.Design/​Query/​Internal/​QueryLocator.cs	Recognizes parameter-based DbContext query roots.
src/​EFCore.Design/​Query/​Internal/​CSharpToLinqTranslator.cs	Translates captured method parameters.
test/​EFCore.Relational.Specification.Tests/​Query/​PrecompiledQueryRelationalTestBase.cs	Adds provider-independent regression tests.
test/​EFCore.SqlServer.FunctionalTests/​Query/​PrecompiledQuerySqlServerTest.cs	Adds expected SQL baselines.

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[AndriySvyryd]

Thanks for your contribution!