Dictionary Extension Methods

DictionaryExtensions.cs

    public static class DictionaryExtensions
    {
        /// <summary>
        /// Add a range of items to a dictionary.
        /// </summary>
        /// <typeparam name="T">type</typeparam>
        /// <typeparam name="TU">type</typeparam>
        /// <param name="source">the dictionary</param>
        /// <param name="dictionary">the range to be added</param>
        public static void AddRange<T, TU>(this IDictionary<T, TU> source, IDictionary<T, TU> dictionary)
        {
            foreach (var kvp in dictionary)
            {
                if (source.ContainsKey(kvp.Key))
                {
                    throw new ArgumentException("An item with the same key has already been added.");
                }
                source.Add(kvp);
            }
        }

        /// <summary>
        /// Add a range of values to a dictionary object. The item will only be added if it is not already in the collection.
        /// </summary>
        /// <typeparam name="T">type</typeparam>
        /// <typeparam name="TU">type</typeparam>
        /// <param name="source">the dictionary</param>
        /// <param name="dictionary">the range to be added</param>
        public static void AddDistinctRange<T, TU>(this IDictionary<T, TU> source, IDictionary<T, TU> dictionary)
        {
            foreach (var kvp in dictionary)
            {
                if (!source.ContainsKey(kvp.Key))
                {
                    source.Add(kvp);
                }
            }
        }
    }