InheritanceAttribute.cs

namespace System.ComponentModel
{
    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Event)]
    public sealed class InheritanceAttribute : Attribute
    {
        private readonly InheritanceLevel inheritanceLevel;

        public static readonly InheritanceAttribute Inherited = new InheritanceAttribute(InheritanceLevel.Inherited);

        public static readonly InheritanceAttribute InheritedReadOnly = new InheritanceAttribute(InheritanceLevel.InheritedReadOnly);

        public static readonly InheritanceAttribute NotInherited = new InheritanceAttribute(InheritanceLevel.NotInherited);

        public static readonly InheritanceAttribute Default = NotInherited;

        public InheritanceLevel InheritanceLevel => inheritanceLevel;

        public InheritanceAttribute()
        {
            inheritanceLevel = Default.inheritanceLevel;
        }

        public InheritanceAttribute(InheritanceLevel inheritanceLevel)
        {
            this.inheritanceLevel = inheritanceLevel;
        }

        public override bool Equals(object value)
        {
            if (value == this)
            {
                return true;
            }
            if (!(value is InheritanceAttribute))
            {
                return false;
            }
            InheritanceLevel inheritanceLevel = ((InheritanceAttribute)value).InheritanceLevel;
            return inheritanceLevel == this.inheritanceLevel;
        }

        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        public override bool IsDefaultAttribute()
        {
            return Equals(Default);
        }

        public override string ToString()
        {
            return TypeDescriptor.GetConverter(typeof(InheritanceLevel)).ConvertToString(InheritanceLevel);
        }
    }
}