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定义

命名空间:

System.Text.Json

程序集：

System.Text.Json.dll

提供将对象或值类型序列化为 JSON 以及将 JSON 反序列化为对象或值类型的功能。

public static class JsonSerializer

继承  Object —》  JsonSerializer

我踩过的坑

public class User
{
    public int Id { get; set; }
}

static void Main(string[] args)
{
    int id = 9;
    string str = "{\"id\": " + id + "}";
    var u = JsonSerializer.Deserialize<User>(str);
    Console.WriteLine($"User ID: {u.Id}, Correct: {id == u.Id}");  // always 0/init/default value
}
  
            

            
            

解决办法

static void Main(string[] args)
{
    int id = 9;
    string str = "{\"id\": " + id + "}";

    var u = JsonSerializer.Deserialize<User>(str);
    Console.WriteLine($"User ID: {u.Id}, Correct: {id == u.Id}");  // always 0/init/default value

    var options = new JsonSerializerOptions
    {
        PropertyNameCaseInsensitive = true,
    };
    u = JsonSerializer.Deserialize<User>(str);
    Console.WriteLine($"User ID: {u.Id}, Correct: {id == u.Id}");
}      
  
            

但是，如果是多个字段都不需要这个参数。

static void Main(string[] args)
{
            
            int id = 9;
            string str = "{\"id\": " + id + "}";

            var u = JsonSerializer.Deserialize<User>(str);
            Console.WriteLine($"User ID: {u.Id}, Correct: {id == u.Id}");  // always 0/init/default value

     var options = new JsonSerializerOptions
     {
           PropertyNameCaseInsensitive = true,
     };
     u = JsonSerializer.Deserialize<User>(str,options);
     Console.WriteLine($"User ID: {u.Id}, Correct: {id == u.Id}");


     str = "{\"code\":\"200\",\"updateTime\":\"2022 - 01 - 25T16: 42 + 08:00\",\"fxLink\":\"http://hfx.link/1tjo1\"," +
                "\"now\":{\"obsTime\":\"2022-01-25T16:33+08:00\",\"temp\":\"5\",\"feelsLike\":\"0\",\"icon\":\"100\",\"text\":\"晴\",\"wind360\":\"315\"," +
                "\"windDir\":\"西北风\",\"windScale\":\"3\",\"windSpeed\":\"14\",\"humidity\":\"21\",\"precip\":\"0.0\",\"pressure\":\"1020\",\"vis\":\"30\"," +
                "\"cloud\":\"0\",\"dew\":\"-17\"},\"refer\":{\"sources\":[\"QWeather\",\"NMC\",\"ECMWF\"],\"license\":[\"no commercial use\"]}}";
     var wn = JsonSerializer.Deserialize<weathernow>(str);
     Console.WriteLine($"httpcode:{ wn.code },updateTime:{ wn.updateTime}");
}

方法