使用Newtonsoft.Json将数据导出至Json文件

导出方法：

        /// <summary>
        /// 导出文件
        /// </summary>
        public void Export(List<Dict> dicts, string filepath)
        {
            File.WriteAllText(filepath, JsonConvert.SerializeObject(dicts, Formatting.Indented));
        }

调用：

            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[0]).ToList(), $"{path}\\{arr[0]}.json");
                Export(data.Where(d => d.dict_type == arr[1]).ToList(), $"{path}\\{arr[1]}.json");
                Export(data.Where(d => d.dict_type == arr[2]).ToList(), $"{path}\\{arr[2]}.json");
            }
            catch(Exception e)
            {
                Console.WriteLine($"{e.Message}：{e.ToString()}");
            }