.net 5.0 - Newtonsoft.Json JObject / JArray

JsonConvert.DeserializeObject<T>(string json)//反序列化
JsonConvert.SerializeObject(object obj) //序列化

public class Person
{
    public int Age { get; set; }

    public string Name { get; set; }

    [JsonIgnore]
    public string Sex { get; set; }
}

public class Person
{
    public int Age { get; set; }

    public string Name { get; set; }

    [JsonProperty(PropertyName = "SepcialSex")]
    public string Sex { get; set; }
}

//构建一个json对象，描述了一个老师的实体，里面包含老师的基本属性（名称、年龄），所管理的班级属性，所管理的班级的学生数组
dynamic teacher = new 
{ 
    name = "张三", 
    age = 51, 
    classRoom = new 
    { 
        name = "1年级1班", 
        desc = "描述" 
    }, 
    students = new[] 
    { 
        new { name = "小明" }, 
        new { name = "小红" } 
    } 
};
//序列化
string jsonStr = JsonConvert.SerializeObject(teacher);

jsonStr = "{\"name\":null,\"age\":null,\"classroom\":{\"name\":\"1年级1班\",\"desc\":\"描述\"},\"students\":[{\"name\":\"小名\"},{\"name\":\"小红\"}]}";

JObject jTeacher = JObject.Parse(jsonStr);
//获取一级数据 .Value<T>方式 / ToString() 方式
string teacherName = jTeacher["name"].Value<string>();//区分大小写，没有会报异常
string teacherGender = jTeacher["gender"].ToString();//区分大小写，没有会报异常
int? teacherAge = jTeacher["age"].Value<int?>();//数字如果是null，而接收类型不是可空类型，则会报异常

string className = jTeacher["classRoom"]["name"].Value<string>();

if (jTeacher.Property("name") != null)
{
    Console.WriteLine("有");
}

//jTeacher["students"].Value<string>();//这个是错误的，数组无法转为string
JArray students = JArray.Parse(jTeacher["students"].ToString());//null或者""都会报错
foreach (var item in students)
{
    string studentName = item["name"].Value<string>();
}

foreach (JProperty item in obj.Children())
{
    Console.WriteLine("Name=" + item.Name + "-Value=" + item.Value);
}

JObject obj = new JObject();
obj.Add("ID", 1);
obj.Add("Name", "张三");
obj.Add("Birthday", DateTime.Parse("2000-01-02"));
obj.Add("IsVIP", true);
obj.Add("Account", 12.34f);

JArray array = new JArray();
array.Add(new JValue("吃饭"));
array.Add(new JValue("睡觉"));
obj.Add("Favorites", array);
obj.Add("Remark", null);

JArray array1 = new JArray("吃饭", "睡觉");

/// <summary>添加一个属性
/// C#给JSON对象添加一个键值对
/// </summary>
/// <param name="obj">待添加属性的对象</param>
/// <param name="key">键名</param>
/// <param name="value">值</param>
/// <returns>添加属性后的对象</returns>
public static object Add(object obj, string key, object value)
{
    JObject jObj = JObject.Parse(JsonConvert.SerializeObject(obj));
    jObj.Add(new JProperty(key, value));
    return JsonConvert.DeserializeObject(jObj.ToString());
}

/// <summary>添加一个属性
/// C#给JSON字符串添加一个键值对
/// </summary>
/// <param name="obj">待添加属性的对象</param>
/// <param name="key">键名</param>
/// <param name="value">值</param>
/// <returns>添加属性后的对象</returns>
public static object AddStr(string obj, string key, object value)
{
    JObject jObj = JObject.Parse(obj);
    jObj.Add(new JProperty(key, value));
    return JsonConvert.DeserializeObject(jObj.ToString());
}