無法使用通用接口將子 class 保存在具有父 class 的變量的通用父變量中

Question

我正在嘗試制作一個庫存系統，您可以在其中輕松添加新武器類型。 只需從 class ToolInformation 創建一個孩子並輸入它需要使用的攻擊系統。

但是我無法將子類（ MeleeWeaponInformation<MeleeAttack> ）保存在變量ToolInformation<IAttack>中

有誰知道讓這個想法發揮作用的方法？

錯誤：無法將類型“MeleeWeaponInformation”隱式轉換為“ToolInformation”

通用 class

[CreateAssetMenu(fileName = "New tool", menuName = "ScriptableObjects/Tool")]
public class ToolInformation<T> : ItemInformation where T : IAttack
{
    public T GetComponent(GameObject gameObject)
    {
        return gameObject.GetComponent<T>();
    }
}

兒童 Class

[CreateAssetMenu(fileName = "New melee weapon", menuName = "ScriptableObjects/Melee weapon")]
public class MeleeWeaponInformation : ToolInformation<MeleeAttack>
{
}

試圖將其保存在這樣的變量中

ToolInformation<IAttack> tool = (MeleeWeaponInformation)inventory.items[i].information;
if (tool)
{
    selectedTool = tool;
    playerController.attack += selectedTool.GetComponent(playerController.gameObject).AttackCall;
}

Answer 1

你這樣做：

ItemInformation item = new MeleeWeaponInformation();

並添加

public IAttack GetComponent(GameObject gameObject)

到項目信息。

[CreateAssetMenu(fileName = "New tool", menuName = "ScriptableObjects/Tool")]
public class ToolInformation<T> : ItemInformation where T : IAttack
{
    public T GetComponent(GameObject gameObject)
    {
        return gameObject.GetComponent<T>();
    }

    IAttack ItemInformation.GetComponent(GameObject gameObject)
        => GetComponent(GameObject gameObject);

}

Answer 2

我找到了一種不同的方法來獲得我想要的相同結果，但感謝您的幫助。

我的解決方案：

[CreateAssetMenu(fileName = "New tool", menuName = "ScriptableObjects/Tool")]
public abstract class ToolInformation : ItemInformation
{
    public abstract IAttack EnableTool(GameObject gameObject);
}

[CreateAssetMenu(fileName = "New melee weapon", menuName = "ScriptableObjects/Melee weapon")]
public class MeleeWeaponInformation : ToolInformation
{
    []public float damage = 1;

    public override IAttack EnableTool(GameObject gameObject)
    {
        return gameObject.GetComponent<MeleeAttack>();
    }
}

ToolInformation tool = (MeleeWeaponInformation)inventory.items[i].information;
if (tool)
{
    Debug.LogError("Tool Selected");
    selectedTool = tool;
    playerController.attack += selectedTool.EnableTool(playerController.gameObject).AttackCall;
}