如何向枚举添加多个属性？ [英] How do I add multiple attributes to an Enum?

问题描述

我有一个名为 ClientCreditResolutionPlanActionType 的SQL查找表，我想将其转换为枚举中，显示标记为'c＃' rel = tag> c＃。

I have a SQL lookup-table called ClientCreditResolutionPlanActionType that I want to convert to an enum in c#.

非常基本的请求，对吧？是的。

Very basic request, right? Right.

我的桌子，现在枚举，但是，有几列，或者现在有需要与之一起使用的描述属性：

My table, now enum, however, has several columns, or now, description properties that need to go with it:

• StatusIcon


• StatusText


• TypeText

所以我想我可以做...

So I figured I could do ...

namespace System.ComponentModel
{
    class StatusIconAttribute : Attribute
    {
        public string StatusIcon;
        public StatusIconAttribute(string statusIcon) { StatusIcon = statusIcon; }
    }

    class StatusTextAttribute : Attribute
    {
        public string StatusText;
        public StatusTextAttribute(string statusText) { StatusText = statusText; }
    }

    class TypeTextAttribute : Attribute
    {
        public string TypeText;
        public TypeTextAttribute(string typeText) { TypeText = typeText; }
    }
}

...在我的扩展程序中。 cs 类...

... in my Extensions.cs class ...

public static class EnumExtensions
{
    public static string GetStatusIcon(this Enum value)
    {
        var type = value.GetType();

        string name = Enum.GetName(type, value);              
        if (name == null) { return null; }

        var field = type.GetField(name);
        if (field == null) { return null; }

        var attr = Attribute.GetCustomAttribute(field, typeof(StatusIconAttribute)) as StatusIconAttribute;
        if (attr == null) { return null; }

        return attr.StatusIcon;
    }

    public static string GetStatusText(this Enum value)
    {
        var type = value.GetType();

        string name = Enum.GetName(type, value);              
        if (name == null) { return null; }

        var field = type.GetField(name);
        if (field == null) { return null; }

        var attr = Attribute.GetCustomAttribute(field, typeof(StatusTextAttribute)) as StatusTextAttribute;
        if (attr == null) { return null; }

        return attr.StatusText;
    }

    public static string GetTypeText(this Enum value)
    {
        var type = value.GetType();
        string name = Enum.GetName(type, value);              

        var type = value.GetType();

        string name = Enum.GetName(type, value);              
        if (name == null) { return null; }

        var field = type.GetField(name);
        if (field == null) { return null; }

        var attr = Attribute.GetCustomAttribute(field, typeof(TypeTextAttribute)) as TypeTextAttribute;
       if (attr == null) { return null; }

        return attr.TypeText;
    }
}

...最后在我的其他项目中使用它像这样：

... and finally in my other project use it like:

namespace ClientSystemServiceLibrary.Enums
{
    [DataContract]
    public enum ClientCreditResolutionPlanActionType
    {
        [EnumMember]
        [TypeText("New resolution plan submitted.")]
        [StatusText("New Plan")]
        [StatusIcon("star.png")]
        NewPlan = 1,

        [EnumMember]
        [TypeText("Resolution plan waiting on approval.")]
        [StatusText("Under Review")]
        [StatusIcon("review.png")]
        UnderReview = 2,

        [EnumMember]
        [TypeText("Resolution plan approved.")]
        [StatusText("Approved")]
        [StatusIcon("check.png")]
        Approved = 3,

        [EnumMember]
        [TypeText("Resolution plan rejected.")]
        [StatusText("Rejected")]
        [StatusIcon("cross.png")]
        Rejected = 4,

        [EnumMember]
        [TypeText("New resolution plan comment submitted.")]
        [StatusText("New Comment")]
        [StatusIcon("message.png")]
        NewComment = 5
    }
}E

除了，我认为是错误的，因为我收到以下错误消息：

Except, what I figured was wrong, as I'm receiving these error messages:

由于其保护级别，'System.CompenentModel.TypeTextAttribute'无法访问

'System.CompenentModel.TypeTextAttribute' is inaccessible due to its protection level

和

找不到类型或名称空间名称'TypeText'（是否缺少using指令或程序集引用？）

The type or namespace name 'TypeText' could not be found (are you missing a using directive or an assembly reference?)

对所有3个人都相同...。

Same ... for all 3.

推荐答案

默认情况下，所有类都是内部的。如果希望从其他程序集中访问它们，则应指定公共访问修饰符。像这样：

By default, all classes are internal. You should specify "public" access modifier, if you want them to be accessible from other assemblies. Like this:

public class TypeTextAttribute : Attribute
{
    public string TypeText;
    public TypeTextAttribute(string typeText) { TypeText = typeText; }
}

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