CSharp: read or write json using System.Text.Json in donet 7

 

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/// <summary>    /// 温度高低    /// geovindu    /// </summary>    public class HighLowTemps    {        /// <summary>        /// 高        /// </summary>        public int High { get; set; }        /// <summary>        /// 低        /// </summary>        public int Low { get; set; }    }   /// <summary>    /// 天气情况    /// geovindu    /// </summary>    public class WeatherForecast    {        /// <summary>        /// 日期        /// </summary>          public DateTimeOffset Date { get; set; }        /// <summary>        /// 摄氏温度        /// </summary>        public int TemperatureCelsius { get; set; }        /// <summary>        /// 天气        /// </summary>        public string? Summary { get; set; }        /// <summary>        /// 天气 摘要        /// </summary>        public string? SummaryField;        /// <summary>        /// 时间        /// </summary>        public IList<DateTimeOffset>? DatesAvailable { get; set; }        /// <summary>        /// 温度范围        /// </summary>        public Dictionary<string, HighLowTemps>? TemperatureRanges { get; set; }        /// <summary>        /// 天气 相关关键描述        /// </summary>        public string[]? SummaryWords { get; set; }        }     /// <summary>    /// geovindu    /// </summary>    public class JsonBll    {          /// <summary>        /// geovindu        /// </summary>        public JsonBll() { }        /// <summary>        ///        /// </summary>        /// <param name="json"></param>        public JsonBll(string json)        {          }        /// <summary>        /// 序列化 Serialize        /// </summary>        /// <returns></returns>        public string JsonSerialize()        {            var weatherForecast = new WeatherForecast            {                Date = DateTime.Parse("2019-08-01"),                TemperatureCelsius = 25,                Summary = "Hot",                SummaryField = "Hot",                DatesAvailable = new List<DateTimeOffset>()                    { DateTime.Parse("2019-08-01"), DateTime.Parse("2019-08-02") },                TemperatureRanges = new Dictionary<string, HighLowTemps>                {                    ["Cold"] = new HighLowTemps { High = 20, Low = -10 },                    ["Hot"] = new HighLowTemps { High = 60, Low = 20 }                },                SummaryWords = new[] { "Cool", "Windy", "Humid" }            };              var options = new JsonSerializerOptions { WriteIndented = true };            string jsonString = JsonSerializer.Serialize(weatherForecast, options);            //JsonSerializer.Deserialize            return jsonString;          }        /// <summary>        /// 序列化        /// </summary>        /// <param name="weatherForecast"></param>        /// <returns></returns>        public string JsonSerialize(WeatherForecast weatherForecast)        {            //var weatherForecast = new WeatherForecast            //{            //    Date = DateTime.Parse("2019-08-01"),            //    TemperatureCelsius = 25,            //    Summary = "Hot",            //    SummaryField = "Hot",            //    DatesAvailable = new List<DateTimeOffset>()            //        { DateTime.Parse("2019-08-01"), DateTime.Parse("2019-08-02") },            //    TemperatureRanges = new Dictionary<string, HighLowTemps>            //    {            //        ["Cold"] = new HighLowTemps { High = 20, Low = -10 },            //        ["Hot"] = new HighLowTemps { High = 60, Low = 20 }            //    },            //    SummaryWords = new[] { "Cool", "Windy", "Humid" }            //};              var options = new JsonSerializerOptions { WriteIndented = true };            string jsonString = JsonSerializer.Serialize(weatherForecast, options);            //JsonSerializer.Deserialize            return jsonString;          }        /// <summary>        /// 反序列化 Deserialize        /// </summary>        /// <param name="strJson"></param>        /// <returns></returns>        public WeatherForecast JsonDeserialize(string strJson)        {            WeatherForecast weatherForecast = null;            try            {                if(!string.IsNullOrEmpty(strJson))                {                    weatherForecast = JsonSerializer.Deserialize<WeatherForecast>(strJson)!;                }            }            catch(Exception ex)            {                ex.Message.ToString();            }                return weatherForecast;        }                }

 

调用：

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JsonBll jsonBll = new JsonBll(); string str = jsonBll.JsonSerialize();   Console.WriteLine(str);     WeatherForecast weatherForecast=jsonBll.JsonDeserialize(str); Console.WriteLine("天气："+weatherForecast.Summary);

　　

输出：

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{   "Date": "2019-08-01T00:00:00+08:00",   "TemperatureCelsius": 25,   "Summary": "Hot",   "DatesAvailable": [     "2019-08-01T00:00:00+08:00",     "2019-08-02T00:00:00+08:00"   ],   "TemperatureRanges": {     "Cold": {       "High": 20,       "Low": -10     },     "Hot": {       "High": 60,       "Low": 20     }   },   "SummaryWords": [     "Cool",     "Windy",     "Humid"   ] } 天气：Hot