System.Collections.Specialized.OrderedDictionary.AsReadOnly C# (CSharp) Method

        public System.Collections.Specialized.OrderedDictionary AsReadOnly() { throw null; }
        public void Clear() { }

        public static IDictionary GetReadOnlyDictionary(IDictionary dictionary)
        {
            Guard.ArgumentNotNull(dictionary, "dictionary");

            OrderedDictionary result = new OrderedDictionary();
            foreach (DictionaryEntry entry in dictionary)
            {
                result.Add(entry.Key, entry.Value);
            }
            return result.AsReadOnly();
        }