Editing Modding Tutorials/Modifying classes

{{BackToTutorials}}

=Changing methods=
Use [[Modding Tutorials/Harmony| Harmony]].

=Adding fields or methods to classes=
You can't. Not even with [[Modding Tutorials/Harmony| Harmony]]. Maybe you want to [[Modding_Tutorials/Def_classes| subclass]] instead?

=Adding fields to Defs=
You can. The game support something called a [[Modding Tutorials/DefModExtension| DefModExtension]]. If you have a Def, you can get your mod extension from it. This allows you to add any custom field to any def.

=Adding behaviour to the Thing class=
If it's a ThingWithComps, you can add a [[Modding Tutorials/ThingComp|ThingComp]] instead. Almost all Things are a ThingWithComps. ThingComps can also be used to store whatever data you need.

=Adding behaviour to the Hediff class=
HediffWithComps also support comps. HediffComps are different from [[Modding Tutorials/ThingComp|ThingComp]]s, but their general use is the same.
@@ Line 15: / Line 15: @@
 =Adding behaviour to the Hediff class=
 HediffWithComps also support comps. HediffComps are different from [[Modding Tutorials/ThingComp|ThingComp]]s, but their general use is the same.
-=Using Harmony to override a non-overridden method=
-You can't. Harmony can only patch methods which are actually implemented. You can't patch what isn't there.
-Alternatives:
-* [[Modding_Tutorials/Modifying_classes#Patching_the_base_class_of_a_subclass|Patch the base]] class instead, then check for the instance.
-* [[Modding_Tutorials/Modifying_classes#Adding_fields_or_methods_to_classes|Subclass]], and then replace it wherever it's created with Harmony.
-=Patching the base class of a subclass=
-[[Modding Tutorials/Harmony|Harmony]] can only patch methods that actually have IL code. What you can do is patch the parent class. Let your patch take the __instance of the parent and pattern match.
-<source lang="csharp">
-if (!(__instance is SubClass))
-    return;
-</source>
-[[Category:Modding tutorials]][[Category:Modding]]