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How to copy a list of class from one script to another containing the same class within

January 16, 2024

ScriptA

public class ScriptA: MonoBehaviour{

public List<LootItemsList> _lootItemsListToUse;

[System.Serializable]
public class LootItemsList
{
    public GameObject _lootItem;
    public Vector3 _lootItemOrigin;
    public float _lootColliderActivationTime = 0.5f;
}}

ScriptB

 public class ScriptB: MonoBehaviour{

public List<LootItemsList> _lootItemsListToUse;

[System.Serializable]
public class LootItemsList
{
    public GameObject _lootItem;
    public Vector3 _lootItemOrigin;
    public float _lootColliderActivationTime = 0.5f;
}

void Start(){
ScriptA scriptA = ObjA.GetComponent<ScriptA>();
    _lootItemsListToUse = scriptA._lootItemsListToUse;
}}

I get this error :
Error CS0029 Cannot implicitly convert type ‘System.Collections.Generic.List<ScriptB.LootItemsList>’ to ‘System.Collections.Generic.List<ScriptA.LootItemsList>’

I also tried this

_lootItemsListToUse  = new List<ScriptA.LootItemsList>((IEnumerable<ScriptA.LootItemsList>)script._lootItemsList);

no error in MS studio but I get this error on play :
InvalidCastException: Specified cast is not valid.
(wrapper castclass) System.Object.__castclass_with_cache(object,intptr,intptr)

Please can someone help me with the correct way to copy this list? thanks

>Solution :

The most obvious answer would be: Don’t implement it twice. Rather reference it accordingly

ScriptA.cs

public class ScriptA: MonoBehaviour
{
    public List<LootItemsList> _lootItemsListToUse;

    [System.Serializable]
    public class LootItemsList
    {
        public GameObject _lootItem;
        public Vector3 _lootItemOrigin;
        public float _lootColliderActivationTime = 0.5f;
    }
}

ScriptB.cs

public class ScriptB: MonoBehaviour
{
    public List<ScriptA.LootItemsList> _lootItemsListToUse;
    
    void Start()
    {
        ScriptA scriptA = ObjA.GetComponent<ScriptA>();
        _lootItemsListToUse = scriptA._lootItemsListToUse;
    }
}

Or even: Don’t nest that class under another at all but have a third script in outer scope

LootItemList.cs

[System.Serializable]
public class LootItemsList
{
    public GameObject _lootItem;
    public Vector3 _lootItemOrigin;
    public float _lootColliderActivationTime = 0.5f;
}

ScriptA.cs

public class ScriptA: MonoBehaviour
{
    public List<LootItemsList> _lootItemsListToUse;
}

ScriptB.cs

public class ScriptB: MonoBehaviour
{
    public List<LootItemsList> _lootItemsListToUse;
    
    void Start()
    {
        ScriptA scriptA = ObjA.GetComponent<ScriptA>();
        _lootItemsListToUse = scriptA._lootItemsListToUse;
    }
}