DesignerSerializationVisibilityAttribute.cs

namespace System.ComponentModel
{
    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Event)]
    public sealed class DesignerSerializationVisibilityAttribute : Attribute
    {
        public static readonly DesignerSerializationVisibilityAttribute Content = new DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Content);

        public static readonly DesignerSerializationVisibilityAttribute Hidden = new DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden);

        public static readonly DesignerSerializationVisibilityAttribute Visible = new DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible);

        public static readonly DesignerSerializationVisibilityAttribute Default = Visible;

        private DesignerSerializationVisibility visibility;

        public DesignerSerializationVisibility Visibility => visibility;

        public DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility visibility)
        {
            this.visibility = visibility;
        }

        public override bool Equals(object obj)
        {
            if (obj == this)
            {
                return true;
            }
            DesignerSerializationVisibilityAttribute designerSerializationVisibilityAttribute = obj as DesignerSerializationVisibilityAttribute;
            if (designerSerializationVisibilityAttribute != null)
            {
                return designerSerializationVisibilityAttribute.Visibility == visibility;
            }
            return false;
        }

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

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