如何获得自定义属性值枚举？ [英] How to get Custom Attribute values for enums?

问题描述

我有一个枚举，其中每个成员都有一个应用于它的自定义属性。我怎样才能检索存储在每个属性的值？

I have an enum where each member has a custom attribute applied to it. How can I retrieve the value stored in each attribute?

现在我做到这一点：

var attributes = typeof ( EffectType ).GetCustomAttributes ( false );
foreach ( object attribute in attributes )
{
    GPUShaderAttribute attr = ( GPUShaderAttribute ) attribute;
    if ( attr != null )
        return attr.GPUShader;
}
return 0;

另一个问题是，如果没有找到，我应该怎么回报？ 0 implcity转换为任何枚举，对不对？这就是为什么我返回。

Another issue is, if it's not found, what should I return? 0 is implcity convertible to any enum, right? That's why I returned that.

忘了说，上面code返回0，每枚举成员。

Forgot to mention, the above code returns 0 for every enum member.

推荐答案

这是一个有点乱做你正在尝试做的，你必须使用反射什么：

It is a bit messy to do what you are trying to do as you have to use reflection:

public GPUShaderAttribute GetGPUShader(EffectType effectType)
{
    MemberInfo memberInfo = typeof(EffectType).GetMember(effectType.ToString())
                                              .FirstOrDefault();

    if (memberInfo != null)
    {
        GPUShaderAttribute attribute = (GPUShaderAttribute) 
                     memberInfo.GetCustomAttributes(typeof(GPUShaderAttribute), false)
                               .FirstOrDefault();
        return attribute;
    }

    return null;
}

这将返回的实例 GPUShaderAttribute ，是有关一个标记上 EffectType 。你必须把它的 EffectType 枚举的特定值：

This will return an instance of the GPUShaderAttribute that is relevant to the one marked up on the enum value of EffectType. You have to call it on a specific value of the EffectType enum:

GPUShaderAttribute attribute = GetGPUShader(EffectType.MyEffect);

一旦有了属性的情况下，你可以得到的具体数值出它是对个人枚举值标记的。

Once you have the instance of the attribute, you can get the specific values out of it that are marked-up on the individual enum values.

这篇关于如何获得自定义属性值枚举？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！