c# - 在枚举中明确定义标志组合

Question

我正在考虑实现一个定义游戏对象状态的枚举，我想知道我是否可以直接在枚举的定义中使用标志，而不是将对象的状态定义为标志的集合，这并不容易，状态机中使用的状态的预定义全局名称。

例如，假设有 5 种状态:PreActivation(已创建但未开始；即 future wave 中的敌人)、Active(当前正在使用；即屏幕上的敌人正在攻击您)、Paused(不再活跃，但可能会重新激活；即如果玩家使用时间卡住能力，则为敌人)，DeActivated(已完成使用但仍在游戏世界中的对象；即死后遗体的敌人，如毁灭战士 1 和 2 ) 和 ToRemove(预定要从游戏中移除的对象；即在您清除一个级别并移动到下一个级别后的敌人)。

我想做的是定义枚举，以便各州拥有所有适用的标志；例如，一个 DeActivated 敌人: 1. 之前已被激活，并且 2. 当前未激活。我目前的想法是做这样的事情:

public enum ObjectState
{
    // The first section are the flags
    BeenActivated   = 0b0000001, // Previously activated
    CurrentlyActive = 0b0000010, // Currently activated
    IsSuspended     = 0b0000100, // It may be reactivated
    ShouldRemove    = 0b0001000, // It should be removed
    // These are the states
    PreActivation   = 0b0000100, // Mot currently active, nor has it ever been active, but it will get activated
    Active          = 0b0000011, // Currently active,     and it's been active
    Paused          = 0b0000101, // Not currently active, but it's been active before
    DeActivated     = 0b0000001, // Not currently active, but it's been active before, and it shouldn't get reactivated, but don't remove yet
    ToRemove        = 0b0001001  // Not currently active, but it's been active before, and it shouldn't get reactivated, it should be removed
}

据我所知，这应该可以正常工作，但我有几个主要问题:

1. 这会带来什么问题吗？
2. 这是不好的做法吗？
3. 这是不好的做法吗？而且，如果是的话；
   • A.有什么问题吗？
   • B.我应该怎么做？我只是让对象的状态成为这些标志的集合，但我想要一个特定状态的简写枚举，因为这允许特定实例的复杂性和需要时的简单性。有没有更容易接受的方法来实现这一点？

如果这是重复或我违反了其他规则，我很抱歉，但我今天刚创建了一个帐户；这是我的第一篇文章。另外，我不确定你在搜索时会怎么调用它，而且我没有从这里或谷歌上得到任何类似的结果。

Answer 1

你可以这样做。这是标志枚举的重点。如果 enum 打算用作标志，请使用 [Flags] 属性对其进行标记。

我建议将现有标志与按位或 (|) 结合起来。它更具可读性且不易出错。

[Flags]
public enum ObjectState
{
    // Flags
    BeenActivated   = 0b0000001, // Previously activated
    CurrentlyActive = 0b0000010, // Currently activated
    IsSuspended     = 0b0000100, // It may be reactivated
    ShouldRemove    = 0b0001000, // It should be removed

    // States as combination of flags.
    PreActivationState   = IsSuspended,                     // Mot currently active, nor has it ever been active, but it will get activated
    ActiveState          = BeenActivated | CurrentlyActive, // Currently active,     and it's been active
    PausedState          = BeenActivated | IsSuspended,     // Not currently active, but it's been active before
    DeActivatedState     = BeenActivated,                   // Not currently active, but it's been active before, and it shouldn't get reactivated, but don't remove yet
    ToRemoveState        = BeenActivated | ShouldRemove     // Not currently active, but it's been active before, and it shouldn't get reactivated, it should be removed
}

我还为各州添加了“州”后缀，以更好地将它们与旗帜区分开来。或者反过来，为标志添加“Flags”后缀。