/// <summary>

        /// 导出文件

        /// </summary>

        public void Export(List<Dict> dicts, string filepath)

        {

            File.WriteAllText(filepath, JsonConvert.SerializeObject(dicts, Formatting.Indented));

        }

            var coll = Mongodb.XXX.GetCollection<Dict>("dict");

            string[] arr = new string[] { "major", "industry", "post_type" };           //专业、行业、职位类别

            var data = await coll.Find(d => arr.Contains(d.dict_type)).ToListAsync().ConfigureAwait(false);

            //创建文件夹

            string path = "D:\\jsonfile";

            if (!Directory.Exists(path))

            {

                Directory.CreateDirectory(path);

            }

            try

            {

                Export(data.Where(d => d.dict_type == arr[]).ToList(), $"{path}\\{arr[0]}.json");

                Export(data.Where(d => d.dict_type == arr[]).ToList(), $"{path}\\{arr[1]}.json");

                Export(data.Where(d => d.dict_type == arr[]).ToList(), $"{path}\\{arr[2]}.json");

            }

            catch(Exception e)

            {

                Console.WriteLine($"{e.Message}：{e.ToString()}");

            }