1、简单的函数，实现Dictionary如果有就替换，，没有就增加的功能。  

/// <summary>
        /// Dictionary增加的方法
        /// </summary>
        /// <typeparam></typeparam>
        /// <typeparam></typeparam>
        /// <param></param>
        /// <param></param>
        /// <param></param>
        /// <returns></returns>
        public static Dictionary<TKey, TValue> AddOrReplace<TKey, TValue>(this Dictionary<TKey, TValue> dict, TKey key, TValue value)
        {
            dict[key] = value;
            return dict;
        }