如何使这个IEnumerable循环通用？

Question

我认为这种方法可以转换成通用的。然后我可以将它用于任何可枚举的类型。我该怎么做这个通用的？

private bool AreAnyInteractablesInThisList(
    IEnumerable<Interactable> Interactables, 
    Interactable InteractableToCheck)
{
    foreach (var Interactable in Interactables)
    {
        if (Interactable.GetInstanceID() == InteractableToCheck.GetInstanceID()) 
            return true;
    }
    return false;
}

Answer 1

您需要创建一个声明GetInstanceID()方法的接口：

public interface IInteractable
{
    int GetInstanceID(); // I guess it's an int, but you can change that accordingly
}

然后使用泛型参数必须实现该接口的约束使方法通用：

private bool AreAnyInteractablesInThisList<T>(IEnumerable<T> Interactables, T InteractableToCheck) where T : IInteractable
{
    foreach (var Interactable in Interactables)
    {
        if (Interactable.GetInstanceID() == InteractableToCheck.GetInstanceID()) return true;
    }
    return false;
}

请注意，您可以将方法缩短为：

private bool AreAnyInteractablesInThisList<T>(IEnumerable<T> Interactables, T InteractableToCheck) where T : IInteractable
{
    // I cache this ID (assuming it was not changing with each call)
    int idToCheck = InteractableToCheck.GetInstanceID();
    return Interactables.Any(interactable => interactable.GetInstanceID() == idToCheck);
}