是否可以向c＃枚举对象添加自定义属性？ [英] Is it possible to add custom properties to c# enum object?

问题描述

使用c＃是否有可能用于关联每个枚举项的属性？

Using c# Is it possible using to associate properties for each enum items?

我使用了描述属性可以为枚举添加英语描述 code>项目。

I have used the Description Attribute to add English description to an enum item.

要在每个项目中添加英文说明，我已经完成了以下操作

To add English description to each item I have done the following

public enum MyEnum
{
    [Description("My First Item")]
    First,

    [Description("My Second Item")]
    Second,

    [Description("My Third Item")]
    Third
}

然后我在枚举中添加了一个扩展方法，称为 GetDescription（），我可以这样获取描述

Then I added an extension method to my enum called GetDescription() which allows me to get the description like so

public static string GetDescription(this Enum value)
{
    Type type = value.GetType();

    string name = Enum.GetName(type, value);

    if (name != null)
    {
        FieldInfo field = type.GetField(name);
        if (field != null)
        {
            DescriptionAttribute attr = Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute)) as DescriptionAttribute;
            if (attr != null)
            {
                return attr.Description;
            }
        }
    }

    return name;
}

但是，如果我能够分配课程，这将对我有很大帮助或构造一个新对象。

However, it will help me a lot if I am able to assign a class or construct a new object.

是否可以/如何执行以下操作？

Is it possible/How can I do something like the follow?

public enum MyEnum
{
    [Description("My First Item"), new { IsFirst = true, UnitType = 1}]
    First
}

或使用课程

public enum MyEnum
{
    [Description("My First Item"), new MyCustomClass(true, 1)]
    First
}

推荐答案

您可以使用自定义属性装饰元素。那些几乎可以包含您想要的任何内容。

You can decorate elements with custom Attributes. Those can contain nearly anything you want.

[AttributeUsage(AttributeTargets.Field, AllowMultiple = false, Inherited = true)]
public class DescriptorAttribute : Attribute
{
    public bool IsFirst { get; }
    public int UnitType { get; }

    public DescriptorAttribute(bool isFirst, int unitType)
    {
        IsFirst = isFirst;
        UnitType = unitType;
    }
}

您将使用以下方式：

public enum Test
{
    [Descriptor(isFirst: true, unitType: 2)]
    Element
}

您已经拥有读取问题中此属性的代码。

you already have the code to read this attribute in your question.

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