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示例：
public class Message
{public string Address { get; set; }
[JsonProperty(TypeNameHandling = TypeNameHandling.All)]
public object Body { get; set; }
}
public class SearchDetails
{public string Query { get; set; }
public string Language { get; set; }
}
Message message = new Message();
message.Address = "http://www.google.com";message.Body = new SearchDetails
{ Query = "Json.NET", Language = "en-us"};
string json = JsonConvert.SerializeObject(message, Formatting.Indented);
// {// "Address": "http://www.google.com",// "Body": {// "$type": "Newtonsoft.Json.Tests.Serialization.SearchDetails, Newtonsoft.Json.Tests",// "Query": "Json.NET",// "Language": "en-us"// }// }Message deserialized = JsonConvert.DeserializeObject<Message>(json);
SearchDetails searchDetails = (SearchDetails) deserialized.Body;
// Json.NET