autofac/Autofac

Support Delegate Factories when compiled in AOT mode

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#1,449 opened on Mar 26, 2025

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enhancementhelp wanted

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Description

Problem Statement

Using delegate factories in Autofac when AOT mode is on causes exceptions because it emits JIT compiled methods. I was not sure whether to open this as a bug or not as I didn't know if it is a supported use case. At the very least, this documentation page https://autofac.readthedocs.io/en/latest/advanced/delegate-factories.html could be updated to state that AOT is not supported.

Desired Solution

Frankly, I'm not sure if its possible to easily support this use case, but perhaps it can be done by generated source code. The desired solution is that delegate factories would work in AOT mode.

Alternatives You've Considered

We could refactor our code base to manually resolve these dependencies but we loose a lot of flexibility.

Additional Context

This problem was discovered when deploying a iOS app in release mode

Contributor guide

Research direction
Investigate the use of source generators to create delegate factories at compile time instead of runtime JIT compilation.
Tech stack
csharp
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#.NETAutofac
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55