c# - 将 Func 传递给 List.Find

Question

我有以下代码：

    [TestMethod]
    public void A_Player_Can_Be_Deleted_From_The_List()
    {                     
        Player player = playerList.Find(ByName("Davy",whatGoesHere?);
        playerList.Remove(player);

        playerList.Count.Should().Be(2);
    }

Func 'ByName' 定义为：

Func<string, Player, bool> ByName = (name, player) => player.Name == name;

我不知道如何传递第二个（玩家）参数。是否可以？

Answer 1

player提供给您传递给的谓词，List.Find<T>因此您可以将其传递给ByName：

Player player = playerList.Find(p => ByName("Davy", p));
playerList.Remove(player);

而不是使用FindandRemove你可以使用List<T>.RemoveAllie

playerList.RemoveAll(p => ByName("Davy", p));

Answer 2

如果要ByName在 Method 中使用委托，则Find必须为列表中的每个元素执行它。例如：

string player = playerList.Find((playerElement) => ByName("Davy", playerElement));