Rock.Web.UI.Controls.RockDropDownList.SaveViewState C# (CSharp) Method

        protected override object SaveViewState()
        {
            ViewState["ItemAttributes"] = this.Items.OfType<ListItem>().Select( a => a.Attributes.Keys.OfType<string>().ToDictionary( k => k, v => a.Attributes[v] ) ).ToList();
            return base.SaveViewState();
        }