试用新的System.Text.Json API

https://devblogs.microsoft.com/dotnet/try-the-new-system-text-json-apis/

对于所有示例，请确保导入以下两个名称空间：

using System.Text.Json;
using System.Text.Json.Serialization;
范例

class WeatherForecast
{
    public DateTimeOffset Date { get; set; }
    public int TemperatureC { get; set; }
    public string Summary { get; set; }
}

string Serialize(WeatherForecast value)
{
    return JsonSerializer.ToString<WeatherForecast>(value);
}

 反序列化

WeatherForecast Deserialize(string json)
{
    var options = new JsonSerializerOptions
    {
        AllowTrailingCommas = true
    };

    return JsonSerializer.Parse<WeatherForecast>(json, options);
}