BrowsableAttribute.cs

namespace System.ComponentModel
{
    [AttributeUsage(AttributeTargets.All)]
    public sealed class BrowsableAttribute : Attribute
    {
        public static readonly BrowsableAttribute Yes = new BrowsableAttribute(browsable: true);

        public static readonly BrowsableAttribute No = new BrowsableAttribute(browsable: false);

        public static readonly BrowsableAttribute Default = Yes;

        private bool browsable = true;

        public bool Browsable => browsable;

        public BrowsableAttribute(bool browsable)
        {
            this.browsable = browsable;
        }

        public override bool Equals(object obj)
        {
            if (obj == this)
            {
                return true;
            }
            BrowsableAttribute browsableAttribute = obj as BrowsableAttribute;
            if (browsableAttribute != null)
            {
                return browsableAttribute.Browsable == browsable;
            }
            return false;
        }

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

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