A library for patching, replacing and decorating .NET and Mono methods during runtime.
Harmony gives you an elegant and high level way to alter the functionality in applications written in C#. It works great in games and is in fact well established in games like
- The Long Dark
- Oxygen Not Included
- 7 Days To Die
- Cities: Skylines
- Kerbal Space Program
- Stardew Valley
- Total Miner
- The Ultimate Nerd Game
It is also used in unit testing Windows Presentation Foundation controls and in many other areas.
If you develop in C# and your code is loaded as a module/plugin into a host application, you can use Harmony to alter the functionality of all the available assemblies of that application. Where other patch libraries simply allow you to replace the original method, Harmony goes one step further and gives you:
A way to keep the original method intact
Execute your code before and/or after the original method
Modify the original with IL code processors
Multiple Harmony patches co-exist and don't conflict with each other
Installation is usually done by referencing the 0Harmony.dll (from the zip file) from your project or by using the Lib.Harmony nuget package.
Also, an introduction to Transpilers: Simple Harmony Transpiler Tutorial
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Hope you enjoy Harmony!