我有3节课:
class Person {
public bool IsFemale { get; set; }
}
class Female : Person {
public string FemaleSpecificProperty { get; set; }
}
class Male: Person {
public string MaleSpecificProperty { get; set; }
}
如何根据property的值将给定的JSON字符串反序列化为特定的实例(Female
或Male
)Person.IsFemale
?(预先我不知道使用了哪个确切类型,并且该属性是唯一的指示)
我看了一下应用程序,CustomCreationConverter<T>
但不知道如何使它在这里工作。
这是您的人员班级的转换器。它获取IsFemale
字段值,并基于它创建Female
或Male
人,由序列化器填充:
public class PersonConverter : JsonConverter
{
public override bool CanConvert(Type objectType)
{
return typeof(Person).IsAssignableFrom(objectType);
}
public override object ReadJson(JsonReader reader, Type objectType,
object existingValue, JsonSerializer serializer)
{
JObject jObject = JObject.Load(reader);
var isFemale = (bool)jObject["IsFemale"];
Person target = isFemale ? (Person)new Female() : new Male();
serializer.Populate(jObject.CreateReader(), target);
return target;
}
public override void WriteJson(JsonWriter writer, object value,
JsonSerializer serializer)
{
throw new NotImplementedException();
}
}
用法:
List<Person> people = new List<Person>
{
new Male { IsFemale = false, MaleSpecificProperty = "Y" },
new Male { IsFemale = false, MaleSpecificProperty = "Y" },
new Female { IsFemale = true, FemaleSpecificProperty = "X" }
};
string json = JsonConvert.SerializeObject(people);
var result =
JsonConvert.DeserializeObject<List<Person>>(json, new PersonConverter());
还要看看alex提出的问题:如何实现自定义JsonConverter
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我来说两句