Json.Net学习笔记(十一) CustomCreationConverter

CustomCreationConverter是一个在序列化过程中提供自定方式去创建一个对象的Json转换器，一旦对象被创建，它将被序列化器填充值。

 public interface IPerson
    {
        string FirstName { get; set; }
        string LastName { get; set; }
        DateTime BirthDate { get; set; }
    }

    public class Employee : IPerson
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime BirthDate { get; set; }

        public string Department { get; set; }
        public string JobTitle { get; set; }
    }
    public class PersonConverter : CustomCreationConverter<IPerson>
    {
        public override IPerson Create(Type objectType)
        {
            return new Employee();
        }
    }

这是一个非常简单的例子。更复杂的场景可能包含一个对象工厂或者服务定位器(service locator)用来在运行时解析这个对象。

测试:   

      string json = @"[
              {
                ""FirstName"": ""Maurice"",
                ""LastName"": ""Moss"",
                ""BirthDate"": ""\/Date(252291661000)\/"",
                ""Department"": ""IT"",
                ""JobTitle"": ""Support""
              },
              {
                ""FirstName"": ""Jen"",
                ""LastName"": ""Barber"",
                ""BirthDate"": ""\/Date(258771661000)\/"",
                ""Department"": ""IT"",
                ""JobTitle"": ""Manager""
              }
            ]";

            List<IPerson> people = JsonConvert.DeserializeObject<List<IPerson>>(json, new PersonConverter());
            IPerson person = people[0];
            Console.WriteLine(person.GetType());// CustomCreationConverterTest.Employee          
            Console.WriteLine(person.FirstName);// Maurice
            Employee employee = (Employee)person;
            Console.WriteLine(employee.JobTitle);// Support