Valheim1CompatBridges

Valheim1CompatBridges

BepInEx preloader patcher for Valheim 1.0 (Unity 6). It adds the old method overloads, fields and

interface defaults back into assembly_valheim.dll at load time, so mods compiled against pre-1.0 builds stop

crashing with MissingMethodException, MissingFieldException: ZRoutedRpc.Everybody, `TypeLoadException:

VTable setup failed or Harmony Undefined target method`. No mod DLL is redistributed.

Tested with (client + dedicated server, BepInEx 5.4.2350):

| Mod | Result |

|---|---|

| MagicMike-Weedheim 2.0.4 | loads and works |

| MagicMike-WeedheimShip 1.0.2 | loads and works |

| KGvalheim-Marketplace_And_Server_NPCs_Revamped 9.8.1 | loads and works, with fix-kg-marketplace.ps1 applied once (see below); NPC map right-click (fashion) has no equivalent in 1.0 and does nothing; transmog icons in the inventory grid are not refreshed |

Install

Put the patchers/Valheim1CompatBridges folder into BepInEx/patchers/ on the client and on the

dedicated server (r2modman Mod Manager do this automatically). Look for

[Valheim1CompatBridges] Gotowe: N mostkow in BepInEx/LogOutput.log.

What it bridges

• Inventory.Changed() → Changed(false, false) (original renamed to ChangedEx, game calls rerouted so

Harmony postfixes on Changed still fire)

• ZRoutedRpc.Everybody const → static field
• InventoryGrid.Element wrapper type (m_go, m_pos, mirrored fields), GetElement/GetHoveredElement

overloads returning it, empty List m_elements_compat (deliberately not named m_elements:

two same-named fields are legal in IL but make AccessTools.Field(type, "m_elements") throw

AmbiguousMatchException, breaking mods that inject ___m_elements by reflection, such as

AzuExtendedPlayerInventory and AzuAutoStore)

• InventoryGrid.Awake() (called from OnEnable), Minimap.OnMapRightClick() stub
• Hoverable.GetHoverOffset() default implementation
• old overloads of: Character.Message, MessageHud.ShowMessage, EffectList.Create,

SEMan.AddStatusEffect (×2), ItemData.GetTooltip, Inventory.IsTeleportable, Humanoid.IsTeleportable,

Inventory.AddItem (12 params), Terminal.ConsoleCommand ctor (12 params), Terminal.ConsoleEventArgs

ctor, YesNoPopup ctor, Heightmap.Poke(bool), TerrainComp.Save(), Piece.SetCreator(long),

VisEquipment.Set*Item(string, …) (prefab name → hash)

Using Marketplace as well?

Marketplace has two breakages the preloader cannot reach, because they live in the mod's own IL: its

Hud.UpdatePieceList transpiler hardcodes local slot 12 for a Piece that Valheim 1.0 moved to 13

(InvalidProgramException, quest markers missing from the build menu), and it reads the old

InventoryGrid.m_elements field from IL. The mod is closed-source, so there is no upstream fix to wait for.

Run this once per machine, against your own copy of the DLL:

pwsh -File tools/fix-kg-marketplace.ps1 -Dll "/BepInEx/plugins/KGvalheim-Marketplace/kg.Marketplace.dll" -Apply

It reads the real slot numbers out of your assembly_valheim.dll instead of trusting a hardcoded one, is

idempotent, and refuses to guess if the layout it expects is gone. Keep the original DLL, and re-run it after

every Marketplace update. The script lives in the repo, not in this package.

Source, and why this is a new project rather than pull requests: