如何从一个字符串中解析两个主题?

这很难解释。我现在正在进行一个文本冒险,我正在分析一个玩家的输入。

当一个玩家输入时,有两个可能的主题(我们称它们为Subject1和Subject2)。例如,在下面的“用棍子打门”中,主题1是“门”,主题2是“棍子”。

在这种情况下,门和斗杆都属于“项目”类型。也可以有“字符”类型的主题。

问题是,如果我分析项目,然后分析字符,项目分析会发现项目是Subject1,即使它实际上是第二个主题。我使用的代码如下:

public static void ParseForSubjects(string Input, Player CurrentPlayer, ref object Subject1, ref object Subject2)
{
    // This method doesn't really work properly, as it looks up Inventory items, Environment items and then Characters in order
    // when it may well be that a character is subject1 and an item is subject2, but they will be reversed because of the parsing order
    Input = Input.ToLower();

    // Parse items in Player inventory
    foreach (Item InventoryItem in CurrentPlayer.Inventory)
    {
        if (Input.Contains(InventoryItem.Name.ToLower()))
        {
            if (Subject1 == null)
            {
                Subject1 = InventoryItem;
            }
            else
            {
                Subject2 = InventoryItem;
            }
        }
    }

    // Parse items in environment
    foreach (Item EnvironmentalItem in CurrentPlayer.CurrentArea.Items)
    {
        if (Input.Contains(EnvironmentalItem.Name.ToLower()))
        {
            if (Subject1 == null)
            {
                Subject1 = EnvironmentalItem;
            }
            else
            {
                Subject2 = EnvironmentalItem;
            }
        }
    }

    // Parse present characters
    foreach (Character PresentCharacter in CurrentPlayer.CurrentArea.Characters)
    {
        if (Input.Contains(PresentCharacter.Name.ToLower()))
        {
            if (Subject1 == null)
            {
                Subject1 = PresentCharacter;
            }
            else
            {
                Subject2 = PresentCharacter;
            }
        }
    }
}

我确信这是否足够清楚。基本上,无论类型如何,我都需要subject1是输入字符串中的第一个主题,subject2是输入字符串中的第二个主题。

请随意提问,这可能不是100%清楚。