c# JSON。净NullValueHandling列表

I have a class like this:

我上过这样的课:

public class media
{
    public string id { get; set; }
    public string code { get; set; }
    public string url { get; set; }
    public string comment_count { get; set; }
    public string like_count { get; set; }

    public int no { get; set; }
}
public c