通过地址前缀随机返回一个对应的地址 eg：北京市海淀-》北京市海淀区学院路x号

/// <summary>
        /// get_address_by_prefix 通过地址前缀随机返回一个对应的地址 eg：北京市海淀-》北京市海淀区学院路x号
        /// 返回GCJ-02坐标系
        /// </summary>
        /// <param name="prefix"></param>
        /// <returns></returns>
        public static gps_base_model get_address_by_prefix_with_dictionary(string prefix)
        {
            prefix = op_dictionry_key(prefix);
 
            if (dictionary_static.Count == 0)
            {
                string key = string.Empty;
                var list = AddressUtil.get_gps_base_data_all_list();
                foreach (var x in list)
                {
                    key = op_dictionry_key(x.ads);
 
                    if (dictionary_static.ContainsKey(key))
                        dictionary_static[key].Add(x);
                    else
                        dictionary_static.Add(key, new List<gps_base_model>() {x});
                }
            }
 
            if (dictionary_static.ContainsKey(prefix).is_false()) return null;
 
            var ls = dictionary_static[prefix];
 
            return ls[Utility.get_random_int_by_min_max(0, ls.Count - 1)];
        }