使用JsonConvert序列化对象时没有结果

Question

This is my class :

class teacher_details_uploadable
    {
         string firstName;
         string lastName;
         string contactNumber;
         string emailaddress;
        List<string> classes_names = new List<string>();
        List<all_class_details> all_the_classes_under_teacher = new List<all_class_details>();
        public teacher_details_uploadable()
        {
            firstName = Teacher.FirstName;
            lastName = Teacher.Lastname;
            contactNumber = Teacher.Contactnumber;
            emailaddress = Teacher.Emailaddress;
            classes_names = Teacher.Classes_Names;
            all_the_classes_under_teacher = Teacher.All_the_classes_under_teacher;
        }
    }

Code for converting its object into text:

teacher_details_uploadable teacher = new teacher_details_uploadable();
            var text=JsonConvert.SerializeObject(teacher);

But in text i get this {}

Answer 1

Json.NET's default behavior only processes fields that are public. So change your non-public fields like so:

 public string firstName;
 public string lastName;
 public string contactNumber;
 public string emailaddress;
 ...

Another work around, if you're unable publicize the fields, is to use the JsonProperty attribute of Json.Net as shown below:

class teacher_details_uploadable
    {    [JsonProperty]
         string firstName;
         [JsonProperty]
         string lastName;
         [JsonProperty]
         string contactNumber;
         [JsonProperty]
         string emailaddress;
         ...

Answer 2

You're getting a blank text json object because none of your properties are public. By default they are internal, and will not be serialized.

Answer 3

Properties and fields need to be public for JsonConvert to be able to serialize them. Ie string firstName; should be public string firstName; . If you cannot make these fields public consider using a custom Converter .