如何知道为类型定义的属性? [英] How to know the attributes defined for a type?

问题描述

我已经定义了一个自定义属性，并将其添加到了几个类中.知道我正在使用反射来捕获程序集中的所有类型.我只想过滤出已定义此属性的类型.

I have defined a custom attribute and added it to a few classes. Know I'm using reflection to capture all types in the assembly. I want to filter out only the type that have this attribute defined.

我已经看到Type对象的Attributes属性，但是它仅返回

I've seen the Attributes property for a Type object, but it returns only the values contained in a specific enum.

如何检索定义了自定义属性的类型?

How can I retrieve types having a custom attribute defined?

推荐答案

您可以这样做:

object[] attributes = typeof(SomeType).GetCustomAttributes(typeof(YourAttribute), true);

但是我更喜欢使用自定义扩展方法:

But I prefer to use custom extension methods:

public static class ReflectionExtensions
{
    public static TAttribute GetAttribute<TAttribute>(this ICustomAttributeProvider obj, bool inherit)
        where TAttribute : Attribute
    {
        return obj.GetAttributes<TAttribute>(inherit).FirstOrDefault();
    }

    public static IEnumerable<TAttribute> GetAttributes<TAttribute>(this ICustomAttributeProvider obj, bool inherit)
        where TAttribute : Attribute
    {
        return obj.GetCustomAttributes(typeof (TAttribute), inherit).Cast<TAttribute>();
    }

    public static bool HasAttribute<TAttribute>(this ICustomAttributeProvider obj, bool inherit)
        where TAttribute : Attribute
    {
        return obj.GetAttributes<TAttribute>(inherit).Any();
    }
}

(它们还适用于程序集，方法，属性等，而不仅适用于类型)

(they work also for assemblies, methods, properties, etc, not just for types)

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