[Bug]: TryResolve{Property}Array methods generate ModelReaderWriter.Write calls with missing arg in OpenAI

[MaiLinhP]

Describe the bug

The new TryResolve{Property}Array methods currently generate ModelReaderWriter.Write(collection, options);, which causes AOT trimming error in OpenAI as it's expecting ModelReaderWriter.Write(collection, options, OpenAIContext.Default);

This ModelReaderWriter.Write call is being generated correctly with the needed OpenAIContext.Default argument everywhere else.

Reproduction

Upgrade OpenAI to newest generator version, run Invoke_Codegen, and then run dotnet build.

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[github-actions]

🎯 Issue Triage

The TryResolve{Property}Array methods in the C# client emitter generate ModelReaderWriter.Write(collection, options) calls that are missing the OpenAIContext.Default argument required for AOT trimming compatibility, whereas all other generated code correctly includes this argument.

Category: Bug
Area: emitter:client:csharp

⚠️ No reproduction provided. A minimal repro would help diagnose this issue. (The described steps involve a private codebase — a minimal TypeSpec snippet triggering the incorrect codegen would help.)

🔍 Analysis

• The bug is in the C# client emitter (@typespec/http-client-csharp), specifically in the code generation path for TryResolve{Property}Array methods.
• These methods emit ModelReaderWriter.Write(collection, options) instead of ModelReaderWriter.Write(collection, options, OpenAIContext.Default), which causes AOT trimming errors in the OpenAI library.
• The OpenAIContext.Default (model reader/writer context) argument is generated correctly everywhere else, suggesting this is an oversight in the array property resolution code path.

📝 Suggested next steps

• Locate the code generation logic for TryResolve{Property}Array methods in the C# emitter and compare it to the corresponding non-array property resolution code paths.
• Fix the emitter to include the model reader/writer context argument in the generated ModelReaderWriter.Write call.
• Add a test case that verifies the correct codegen for array property resolution methods.

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