類型安全的枚舉或屬性枚舉？

Question

我的第一種方法看起來像它會很好地工作，直到我有一個運行時錯誤，我不知道如何解決在var name = ((LCData)attributes[0]).Name;有關索引超出範圍。實際上，我只是複製了我在Getting attributes of Enum's value找到的代碼，所以我並不是100％確定它實際上做了什麼。所以當下面的代碼不起作用時，我轉向另一個解決方案。

public enum Identification : ushort 

{ 

    [LCAttribute("IMG_BG01_Greens")] 
    BG01_Greens = 0, 

    [LCAttribute("Rabbit", "IMG_E01_Rabbit")] 
    ENEMY_E01_Rabbit = 2000, 
} 

public static class Enums 
{ 
    public static LCData GetInfo(Identification id) 
    { 
     var type = typeof(Identification); 
     var memInfo = type.GetMember(id.ToString()); 
     var attributes = memInfo[0].GetCustomAttributes(typeof(LCData), false); 
     var name = ((LCData)attributes[0]).Name; 
     var tex = ((LCData)attributes[0]).Texture; 

     LCData data; 
     data.Name = name; 
     data.Texture = tex; 
     return data; 
    } 
} 

public struct LCData 
{ 
    public string Name; 
    public string Texture; 

    public LCData(Identification id) 
    { 
     this = Enums.GetInfo(id); 
    } 
} 

public class LCAttribute : System.Attribute 
{ 
    private string _Name; 
    public string Name 
    { 
     get 
     { 
      return _Name; 
     } 
    } 

    private string _Texture; 
    public string Texture 
    { 
     get 
     { 
      return _Texture; 
     } 
    } 

    public LCAttribute(string texture) 
    { 
     _Texture = texture; 
    } 

    public LCAttribute(string name, string texture) 
    { 
     _Name = name; 
     _Texture = texture; 
    } 
} 

其次我嘗試了類型安全的方法。這有2個致命的缺點，我找不到解決方案：

1）我無法獲得循環操作的可用枚舉條目列表。

2）我無法通過id號獲得相應的enum條目。

public sealed class Identification 
{ 

    private readonly ushort _ID; 
    private readonly string _Name; 
    private readonly string _Tex; 

    public static readonly Identification BG01_Greens = new Identification(0, "IMG_BG01_Greens"); 
    public static readonly Identification ENEMY_E01_Rabbit = new Identification(2000, "Rabbit", "IMG_E01_Rabbit"); 

    private Identification(ushort id, string tex) 
    { 
     _ID = id; 
     _Tex = tex; 
    } 

    private Identification(ushort id, string name, string tex) 
    { 
     _ID = id; 
     _Name = name; 
     _Tex = tex; 
    } 
    public ushort ID { get { return _ID; } } 
    public string Name { get { return _Name; } } 
    public string Texture { get { return _Tex; } } 
} 

我應該如何繼續？爲什麼我的第一個解決方案不工作？

Answer 1

你很困惑LCData和LCAttriubte。因爲LCAttribute是有效的屬性，但您嘗試使用LCData作爲屬性。 （順便說一句，可能你不需要兩種不同的類型......但我熊與你）。

這個ammended代碼：

public enum Identification : ushort 
{ 
    [LCAttribute("IMG_BG01_Greens")] //Look the type of the attributes is LCAttribute 
    BG01_Greens = 0, 

    [LCAttribute("Rabbit", "IMG_E01_Rabbit")] 
    ENEMY_E01_Rabbit = 2000, 
} 

public static class Enums 
{ 
    public static LCData GetInfo(Identification id) 
    { 
     var type = typeof(Identification); 
     var memInfo = type.GetMember(id.ToString()); 
     //this will return an array of LCAttributes 
     var attributes = memInfo[0].GetCustomAttributes(typeof(LCAttribute), false); 
     //I tell you they are LCAttribute not LCData 
     var name = ((LCAttribute)attributes[0]).Name; 
     var tex = ((LCAttribute)attributes[0]).Texture; 
     //If the above were an LCData why would create a new one here? [Rethorical] 
     LCData data; 
     data.Name = name; 
     data.Texture = tex; 
     return data; 
    } 
} 

注：對於altenatives方法，也許一些洞察到這種方法，你可以看到my answer to How do you make an 'enum' that has data tied to it?。您在此處使用的方法在「自定義屬性」下列出。