“Type not expected”, using DataContractSerializer - but it's just a simple class, no funny stuff?

Question

I\'m refactoring my XML-serialization, and figured I\'d try the DataContractSerializer. Everything runs smoothly, until it needs to serialize this class:

Answer 1

Add this to WebApiConfig.cs

GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;

var json = config.Formatters.JsonFormatter;

json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
config.Formatters.Remove(config.Formatters.XmlFormatter);

Reference: http://www.datazx.cn/Forums/en-US/a5adf07b-e622-4a12-872d-40c753417645/action?threadDisplayName=web-api-error-the-objectcontent1-type-failed-to-serialize-the-response-body-for-content&forum=wcf