是否可以在枚举中保存一个Type（使用“typeof（）”）？

本文介绍了是否可以在枚举中保存一个Type（使用“typeof（）”）？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 所以我在XNA，C＃4.0中创建一个游戏，我需要管理大量的PowerUps（代码中都是继承自PowerUp类），并且处理PowerUps I的后端管理当前有一个枚举，PowerupEffectType，具有PowerUp的每个子类的值。最终在代码中，我需要从PowerupEffectType转换为Powerup类型（类 Type ，通常使用 typeof（[class name]））。

由于这是一个组项目，我想要将PowerupEffectType的每个值与其相应的类类型结合起来，也就是：不只是期望我的其他程序员使用switch语句来手动进行转换，并且确保添加/扩展稍后在尽可能少的地方涉及少量更改。我有几个选择，迄今为止我发现的最好的是创建枚举伪方法，将所有内容都集中到一个switch语句（我想要的99％），感谢我在这里找到的一些提示： a href =msdn.microsoft/en-us/library/bb383974.aspx =noreferrer> msdn.microsoft/en-us/library/bb383974.aspx

但是我想再进一步 - 我可以保存一个类型在枚举？我知道您可以将枚举作为特定类型保存（链接： msdn.microsoft/en-us/library/cc138362.aspx ），但 Type 不是其中之一。当前的选择是字节，字节，短，ushort，int，uint，long和ulong 。有没有可行的方式来保存转换为类型到任何上述数据类型，并返回？

要清楚，这就是我可以做的事情，我正在寻找一种方法：

//（假设LightningPowerup，FirePowerup和WaterPowerup是 //所有声明的类继承自单个基类） public enum PowerupEffectType { LIGHTNING = typeof（LightningPowerup）， FIRE = typeof（FirePowerup）， WATER = typeof（WaterPowerup）}

有没有办法做到这一点，或者我只是解决了已经99％完成的问题的解决方案？

提前感谢

解决方案

你不能像值，但您可以在属性中指定：

使用系统; 使用System.Runtime.CompilerServices; [AttributeUsage（AttributeTargets.Field）] public class EffectTypeAttribute：Attribute { public Type Type {get;私人集合 public EffectTypeAttribute（Type type） { this.Type = type; } } public class LightningPowerup {} public class FirePowerup {} public class WaterPowerup {} public枚举PowerupEffectType { [EffectType（typeof（LightningPowerup））] 闪电， [EffectType（typeof（FirePowerup））] Fire， [ EffectType（typeof（WaterPowerup））] 水}

通过反射在执行时提取这些属性值。但是，我会个人只需创建一个字典：

private static Dictionary< PowerupEffectType，Type> EffectTypeMapping = new Dictionary< PowerupEffectType，Type> { {PowerupEffectType.Lightning，typeof（LightningPowerup）}， {PowerupEffectType.Fire，typeof（FirePowerup）}， {PowerupEffectType.Water，typeof（WaterPowerup）} };

无需特殊属性，无需使用虚拟反思代码提取值。

So I'm creating a game in XNA, C# 4.0, and I need to manage a lot of PowerUps (which in code are all inherited from class "PowerUp"), and to handle back-end management of the PowerUps I currently have an enum, PowerupEffectType, with a value for each child class of PowerUp. Eventually in the code I need to do conversions from PowerupEffectType to the Powerup type (of class Type, achieved usually with typeof([class name])).

Since this is a group project, I want to marry each value of PowerupEffectType to its corresponding class Type as well as possible, i.e.: Not just expect my other programmers to use switch statements to do the conversion manually, and making sure additions/expansions later involve as few changes in as few places as possible. I have a few options for this, and the best I've discovered so far is creating enum pseudo-methods that condense everything down to a single switch statement (99% of what I want), thanks to some tips I found here: msdn.microsoft/en-us/library/bb383974.aspx

But I'm trying to take it one step further - can I save a Type in an enum? I know you can save enums as a specific type (link: msdn.microsoft/en-us/library/cc138362.aspx), but Type isn't one of them. The current choices are byte, sbyte, short, ushort, int, uint, long, and ulong. Is there any feasible way to save a convert a Type to any of the above data types and back?

Just to be clear, this is what I WISH I could do, and I'm looking for a way to do:

// (Assuming 'LightningPowerup', 'FirePowerup', and 'WaterPowerup' are // all declared classes that inherit from a single base class) public enum PowerupEffectType { LIGHTNING = typeof(LightningPowerup), FIRE = typeof(FirePowerup), WATER = typeof(WaterPowerup) }

Is there any way to do this, or am I just overcomplicating a solution to a problem that's already 99% complete?

Thanks in advance!

解决方案

You can't do it as the value of an enum, but you could specify it in an attribute:

using System; using System.Runtime.CompilerServices; [AttributeUsage(AttributeTargets.Field)] public class EffectTypeAttribute : Attribute { public Type Type { get; private set; } public EffectTypeAttribute(Type type) { this.Type = type; } } public class LightningPowerup {} public class FirePowerup {} public class WaterPowerup {} public enum PowerupEffectType { [EffectType(typeof(LightningPowerup))] Lightning, [EffectType(typeof(FirePowerup))] Fire, [EffectType(typeof(WaterPowerup))] Water }

You can then extract those attribute values at execution time with reflection. However, I would personally just create a dictionary:

private static Dictionary<PowerupEffectType, Type> EffectTypeMapping = new Dictionary<PowerupEffectType, Type> { { PowerupEffectType.Lightning, typeof(LightningPowerup) }, { PowerupEffectType.Fire, typeof(FirePowerup) }, { PowerupEffectType.Water, typeof(WaterPowerup) } };

No need for a special attribute, no need to extract the values with fiddly reflection code.