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•Created by sp00ktober on 3/24/2023 in #help

❔ nested generic interface throws cast exception when added to list

Im working on a mod project and for this i need to handle different updates which are represented by individual classes that all inherit from the same generic interfaces. To accomplish the handling i also wrote a generic interface which can then be implemented by a class that should handle one specific class. In the end i want to have a list of handlers over which i can iterate to process the updates. This is my interface signature

internal interface IComponentUpdateHandler<T, H, C> where T : IComponentMetaclass where H : IComponentUpdate<T> where C : IComponentData<T>

internal interface IComponentUpdateHandler<T, H, C> where T : IComponentMetaclass where H : IComponentUpdate<T> where C : IComponentData<T>

These are the interfaces for the update and data interfaces

public interface IComponentUpdate<C> where C : IComponentMetaclass
public interface IComponentData<C> where C : IComponentMetaclass

public interface IComponentUpdate<C> where C : IComponentMetaclass
public interface IComponentData<C> where C : IComponentMetaclass

This is the signature of one of my handler classes

internal class InventoryModificationState_Handler : IComponentUpdateHandler<InventoryModificationState, InventoryModificationState.Update, InventoryModificationState.Data>

internal class InventoryModificationState_Handler : IComponentUpdateHandler<InventoryModificationState, InventoryModificationState.Update, InventoryModificationState.Data>

These are the signatures of the update and data classes

public class Update : IComponentUpdate<InventoryModificationState>
public class Data : IComponentData<InventoryModificationState>

public class Update : IComponentUpdate<InventoryModificationState>
public class Data : IComponentData<InventoryModificationState>

This is the signature of the base class

public class InventoryModificationState : IComponentMetaclass, IComponentFactory

public class InventoryModificationState : IComponentMetaclass, IComponentFactory

This is how i create the List and fill it with values

 private List<IComponentUpdateHandler<IComponentMetaclass, IComponentUpdate<IComponentMetaclass>, IComponentData<IComponentMetaclass>>> handler { get; set; }
 private ComponentUpdateManager()
 {
     handler = new List<IComponentUpdateHandler<IComponentMetaclass, IComponentUpdate<IComponentMetaclass>, IComponentData<IComponentMetaclass>>>
     {
         new InventoryModificationState_Handler(),
         new PlayerCraftingInteractionState_Handler()
     };
 }

 private List<IComponentUpdateHandler<IComponentMetaclass, IComponentUpdate<IComponentMetaclass>, IComponentData<IComponentMetaclass>>> handler { get; set; }
 private ComponentUpdateManager()
 {
     handler = new List<IComponentUpdateHandler<IComponentMetaclass, IComponentUpdate<IComponentMetaclass>, IComponentData<IComponentMetaclass>>>
     {
         new InventoryModificationState_Handler(),
         new PlayerCraftingInteractionState_Handler()
     };
 }

Im happy for any input as im stuck on this for some hours now 😄

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