Json.net deserializing list gives duplicate items

Question

I have just started using Newtonsoft.Json (Json.net). In my first simple test, I ran into a problem when deserializing generic lists. In my code sample below I serialize an obje

Answer 1

I encountered a similar issue with a different root cause. I was serializing and deserializing a class that looked like this:

public class Appointment
{
    public List Revisions { get; set; }

    public AppointmentRevision CurrentRevision
    {
        get { return Revision.LastOrDefault(); }
    }

    public Appointment()
    {
        Revisions = new List();
    }
}

public class AppointmentRevision
{
    public List Attendees { get; set; }
}

When I serialized this, CurrentRevision was being serialized too. I'm not sure how, but when it was deserializing it was correctly keeping a single instance of the AppointmentRevision but creating duplicates in the Attendees list. The solution was to use the JsonIgnore attribute on the CurrentRevision property.

public class Appointment
{
    public List Revisions { get; set; }

    [JsonIgnore]   
    public AppointmentRevision CurrentRevision
    {
        get { return Revision.LastOrDefault(); }
    }

    public Appointment()
    {
        Revisions = new List();
    }
}