如何将 newtonsoft.json 代码更改为 system.text.json

how to change newtonsoft.json code to system.text.json

我想完全迁移到 .NET Core,所以我需要使用 System.Text.Json 而不是 Newtonsoft.Json。

如何在 System.Text.Json 中编写此代码?

private readonly JsonSerializer _serializer;

_serializer = JsonSerializer.Create(new JsonSerializerSettings
{
  DefaultValueHandling = DefaultValueHandling.IgnoreAndPopulate
});

private JObject _jsonSettings;

protected override void LoadSection(string sectionName, object section)
{    
  var jsonSection = _jsonSettings[sectionName];
  if (jsonSection != null)
  {
    using (var reader = jsonSection.CreateReader())
    {
      _serializer.Populate(reader, section);
    }
  }
}

protected override void SaveSection(string sectionName, object section)
{        
  var settings = _jsonSettings ?? new JObject();
  settings[sectionName] = JObject.FromObject(section);
  _jsonSettings = settings;
}

protected override void LoadDefaults()
{
  _jsonSettings = new JObject();
}

private void LoadFromJson(string json)
{
  _jsonSettings = JObject.Parse(json);
}

请参考官方How to migrate from Newtonsoft.Json to System.Text.Json.

提供了3.1和5版本。请注意,在 3.1 中,您可以安装 5.0 包以获得新功能(例如反序列化字段)。