Dictionary Extensions

DictionaryExtensions.cs

        public static void SmartAdd<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key, TValue value)
        {
            try
            {
                dictionary.Add(key, value);
            }
            catch (ArgumentException e)
            {
                throw new ArgumentException("The key '{0}' already exists.".ToFormat(key), e);
            }
        }