【C# NameValueCollection】 針對NameValueCollection 做 LINQ

        public static Dictionary ParseQueryString(string queryString)
        {
            System.Collections.Specialized.NameValueCollection nvc = System.Web.HttpUtility.ParseQueryString(queryString);

            var a = from key in nvc.Cast()
                    from value in nvc.GetValues(key)
                    where key != null
                    select new { key, value };

            return a.ToDictionary(pair => pair.key, pair => pair.value); ;
        }