MonoWeaver

MonoWeaver is a matching and rewriting tool for C# mod developers. You describe the game logic you are looking for — "two arguments added together", "a field read", "a method call", an if condition — and then choose what should happen before, after, or instead of it.

You normally do not need to count IL instructions. A hook stays stable even when the compiler introduces an extra temporary local or picks a different branch layout.

var damagePattern = Cil.Value((int baseDamage, int bonus) =>
    baseDamage + bonus);

Typical uses:

• changing a calculated value such as damage, price, or cooldown;
• logging a value without changing the game result;
• replacing or removing a game action;
• rewriting a condition built from && and ||;
• using one API for both offline DLL patching and MonoMod ILContext;
• checking the edited method before it is written or executed.

Where to start

• Get it running

  ---

  Pick a package, add it, and land your first offline patch.

  Installation

• Look up a pattern

  ---

  Find the pattern that matches what your decompiler shows, or read the full DSL and rewrite tables.

  Cookbook

• Fix a problem

  ---

  Nothing matched, too much matched, or the verifier rejected your edit.

  Troubleshooting

Scope

MonoWeaver works on managed .NET/Mono assemblies that Mono.Cecil can read. It does not work on IL2CPP or native code.