Fórum ➡ My Category Attribute ↔ New Default Attribute: Behavior ♦, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Reflection;
using System.ComponentModel;

// aljodav ↔ rextester.com/users/376
// 
// In reply to MSDN thread ➡ http://bit.ly/2loFgSl

namespace Rextester
{
    public class MyCategoryAttribute:CategoryAttribute{
        private const string _defaultName="Behavior";
        
        private static volatile MyCategoryAttribute _default;
        public new static MyCategoryAttribute Default{
            get{
                if(_default==null){_default=new MyCategoryAttribute();}
                return _default;
            }
        }
        public new static MyCategoryAttribute Behavior{
            get{return Default;}
        }
        
        public MyCategoryAttribute():base(){}
        public MyCategoryAttribute(string s):base(s){}
        
        protected override string GetLocalizedString(string value){
            return value=="Default"?_defaultName:base.GetLocalizedString(value);
        }
        public override bool IsDefaultAttribute(){
            return Category.Equals(Default.Category);
        }
    }
    
    public class Program
    {
        [MyCategory()]
        public int A{get;set;}
        [MyCategory("Default")]
        public int B{get;set;}
        [MyCategory("Appearance")]
        public int C{get;set;}
        [MyCategory("Focus")]
        public int D{get;set;}
        [MyCategory("Action")]
        public int E{get;set;}
        [MyCategory("Behavior")]
        public int F{get;set;}
        
        public static void Main(string[] args)
        {
            foreach(char c in "ABCDEF"){
                var category=(CategoryAttribute)typeof(Program)
                    .GetProperty(""+c)
                    .GetCustomAttribute(typeof(CategoryAttribute))
                    ;
                Console.WriteLine("property : {0}\tcategory : {1}\tIsDefaultAttribute : {2}",
                                  c,category.Category,category.IsDefaultAttribute());
            }
            
            Console.WriteLine("\nMyCategoryAttribute.Default.Category : {0}",MyCategoryAttribute.Default.Category);
            Console.WriteLine("MyCategoryAttribute.Default.IsDefaultAttribute() : {0}",MyCategoryAttribute.Default.IsDefaultAttribute());
            
            Console.WriteLine("\n\nHello, world!");
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,08 sec, cpu time: 0,08 sec, average memory usage: 12 Mb, average nr of threads: 3