Question 1

How do I create a basic patch with Harmony for a game mod?

Accepted Answer

Start by referencing the Lib.Harmony NuGet package, define a patch class with attributes like [HarmonyPatch], and use prefixes or postfixes to inject code; detailed examples are in the official documentation.

Question 2

What's the difference between Harmony and using Reflection.Emit for runtime code changes?

Accepted Answer

Harmony provides a higher-level, non-destructive API focused on co-existent patches and IL processing, while Reflection.Emit is lower-level and more manual, requiring developers to manage replacement logic and potential conflicts directly.

Question 3

Can Harmony patches be applied to private or internal methods?

Accepted Answer

Yes, Harmony can patch private and internal methods using reflection and IL adjustments, but this may require careful handling of access modifiers and could be less stable in updated assemblies.

Question 4

How do I debug a Harmony patch that isn't working as expected?

Accepted Answer

Use logging within patch methods, check for exceptions in the host application, and consult the Harmony documentation or Discord community for troubleshooting common issues like method signature mismatches.

Question 5

Is Harmony suitable for use in production outside of game modding?

Accepted Answer

While proven in modding and unit testing (e.g., at Microsoft), production use requires caution due to runtime overhead and potential compatibility issues with framework updates or security tools.

Question 6

What are best practices for managing multiple patches in a large project?

Accepted Answer

Organize patches into separate classes or assemblies, use Harmony's co-existent patch system to avoid conflicts, and leverage dependency injection or configuration files for modular control.

Lib.Harmony

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