DisplayNameAttribute.cs

namespace System.ComponentModel
{
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Event)]
    public class DisplayNameAttribute : Attribute
    {
        public static readonly DisplayNameAttribute Default = new DisplayNameAttribute();

        private string _displayName;

        public virtual string DisplayName => DisplayNameValue;

        protected string DisplayNameValue
        {
            get
            {
                return _displayName;
            }
            set
            {
                _displayName = value;
            }
        }

        public DisplayNameAttribute()
            : this(string.Empty)
        {
        }

        public DisplayNameAttribute(string displayName)
        {
            _displayName = displayName;
        }

        public override bool Equals(object obj)
        {
            if (obj == this)
            {
                return true;
            }
            DisplayNameAttribute displayNameAttribute = obj as DisplayNameAttribute;
            if (displayNameAttribute != null)
            {
                return displayNameAttribute.DisplayName == DisplayName;
            }
            return false;
        }

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

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