.Net Core 读取json文件

在.Net Framework中，配置文件一般采用的是XML格式的，.NET Framework提供了专门的ConfigurationManager来读取配置文件的内容，.net core中推荐使用json格式的配置文件，那么在.net core中该如何读取json文件呢？

1、在Startup类中读取json配置文件

在Startup加入配置.

 var configurationBuilder = new ConfigurationBuilder();
            var builder = configurationBuilder.AddJsonFile("UploadFile/GetCourts.json", false, true).AddJsonFile("UploadFile/Queryareadatalevelall.json", false, true);

            var Courtlist = new Courtlist();

            builder.Build().GetSection("Courtsmodel").Bind(Courtlist);
            services.AddSingleton(Courtlist);

构造函数注入读取

   private readonly Courtlist _Courtlist;
        private readonly AreaRootobjectlist _AreaRootobjectlist;


        
        public DmsCacheService(
            AreaRootobjectlist AreaRootobjectlist,
        Courtlist Courtlist,
        ILogger<DmsCacheService> logger,
            AccessAddressDto accessAddress,
            IEasyCachingProvider provider,
            IJudgeBannedWordsService judgeBannedWordsService,
            IJudgeService judgeService,
            IMapper mapper)
        {
            this.provider = provider;
            this.judgeService = judgeService;
            this.judgeBannedWordsService = judgeBannedWordsService;
            this.mapper = mapper;
            this.accessAddress = accessAddress;
            this.logger = logger;
            _Courtlist = Courtlist;
            _AreaRootobjectlist = AreaRootobjectlist;
        }
        
            public List<Court> GetCourts()
        {
            return _Courtlist.Courtlists;
          
        }

2、从硬盘直接读取

定义读取方法

  private T GetDataByLocal<T>(string jsonfileName)
        {
            var res = this.provider.Get<T>(jsonfileName);
            if (res.HasValue)
            {
                return res.Value;
            }

            var filePath = $"/UploadFile/";
            string applicationRoot = AppContext.BaseDirectory;
            var provider = new PhysicalFileProvider(applicationRoot);
            var completeFilePath = Path.Combine(filePath, jsonfileName);
            if (!System.IO.File.Exists(AppContext.BaseDirectory + completeFilePath))
            {
                throw new Exception("文件不存在");
            }
            var formFile = provider.GetFileInfo(completeFilePath);
            var stream = formFile.CreateReadStream();
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
            Encoding encoding = Encoding.GetEncoding("gb2312");
            using var reader = new StreamReader(stream, encoding);
            string rs = reader.ReadToEnd();
            var result = JsonConvert.DeserializeObject<T>(rs);
            this.provider.Set<T>(jsonfileName, result, this.GetExpiredTimeSpan());
            return result;
        }

传入文件名进行读取

 public List<CaseCodeType> GetCaseCodes()
        {
            return this.GetDataByLocal<List<CaseCodeType>>("GetCaseCodes.json");
        }