AttributeUtilities.cs

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using System;
using System.Linq;
using System.Reflection;
 
namespace ReLogic.Utilities;
 
public static class AttributeUtilities
{
    private static class TypeAttributeCache<T, A> where A : Attribute
    {
        public static readonly A Value = typeof(T).GetAttribute<A>();
    }
 
    public static T GetAttribute<T>(this MethodBase method) where T : Attribute
    {
        return (T)method.GetCustomAttributes(typeof(T), inherit: false).SingleOrDefault();
    }
 
    public static T GetAttribute<T>(this Enum value) where T : Attribute
    {
        Type type = value.GetType();
        string name = Enum.GetName(type, value);
        return type.GetField(name).GetCustomAttributes(inherit: false).OfType<T>()
            .SingleOrDefault();
    }
 
    public static A GetCacheableAttribute<T, A>() where A : Attribute
    {
        return TypeAttributeCache<T, A>.Value;
    }
 
    public static T GetAttribute<T>(this Type type) where T : Attribute
    {
        return type.GetCustomAttributes(inherit: false).OfType<T>().SingleOrDefault();
    }
}