TypeNameHandling setting |
This sample uses the TypeNameHandling setting to include type information when serializing JSON and read type information so that the create types are created when deserializing JSON.
public abstract class Business { public string Name { get; set; } } public class Hotel : Business { public int Stars { get; set; } } public class Stockholder { public string FullName { get; set; } public IList<Business> Businesses { get; set; } }
Stockholder stockholder = new Stockholder { FullName = "Steve Stockholder", Businesses = new List<Business> { new Hotel { Name = "Hudson Hotel", Stars = 4 } } }; string jsonTypeNameAll = JsonConvert.SerializeObject(stockholder, Formatting.Indented, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All }); Console.WriteLine(jsonTypeNameAll); // { // "$type": "Newtonsoft.Json.Samples.Stockholder, Newtonsoft.Json.Tests", // "FullName": "Steve Stockholder", // "Businesses": { // "$type": "System.Collections.Generic.List`1[[Newtonsoft.Json.Samples.Business, Newtonsoft.Json.Tests]], mscorlib", // "$values": [ // { // "$type": "Newtonsoft.Json.Samples.Hotel, Newtonsoft.Json.Tests", // "Stars": 4, // "Name": "Hudson Hotel" // } // ] // } // } string jsonTypeNameAuto = JsonConvert.SerializeObject(stockholder, Formatting.Indented, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.Auto }); Console.WriteLine(jsonTypeNameAuto); // { // "FullName": "Steve Stockholder", // "Businesses": [ // { // "$type": "Newtonsoft.Json.Samples.Hotel, Newtonsoft.Json.Tests", // "Stars": 4, // "Name": "Hudson Hotel" // } // ] // } // for security TypeNameHandling is required when deserializing Stockholder newStockholder = JsonConvert.DeserializeObject<Stockholder>(jsonTypeNameAuto, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.Auto }); Console.WriteLine(newStockholder.Businesses[0].GetType().Name); // Hotel