c# - Is there any way to JSON.NET-serialize a subclass of List<T> that also has extra properties?

Question

Ok, we're using Newtonsoft's JSON.NET product, which I really love. However, I have a simple class structure for hierarchical locations that look roughly like this...

public class Location
{
    public string Name{ get; set; }
    public LocationList Locations{ get; set; }
}

// Note: LocationList is simply a subclass of a List<T>
// which then adds an IsExpanded property for use by the UI.
public class LocationList : List<Location>
{
    public bool IsExpanded{ get; set; }
}

public class RootViewModel
{
    public LocationList RootLocations{ get; set; }
}

...and when I serialize them to JSON, it all works great, except the IsExpanded property on the LocationList class is excluded. Only the list's contents are serialized.

Now here's what I'm envisioning would be a good format. It's esentially the same thing as if LocationList wasn't a subclass of List<Location> but rather was just a regular object that had a property called Items of type List<Location> instead.

{
  "Locations":
  {
    "IsExpanded": true,
    "Items": [
      {
        "Name": "Main Residence",
        "Locations":
        {
          "IsExpanded": true,
          "Items": [
            {
              "Name": "First Floor",
              "Locations":
              {
                "IsExpanded": false,
                "Items": [
                  {
                    "Name": "Livingroom"
                  },
                  {
                    "Name": "Dining Room"
                  },
                  {
                    "Name": "Kitchen"
                  }
                ]
            },
            {
              "Name": "Second Floor",
              "Locations":
              {
                "IsExpanded": false,
                "Items": [
                  {
                    "Name": "Master Bedroom"
                  },
                  {
                    "Name": "Guest Bedroom"
                  }
                ]
            },
            {
              "Name": "Basement"
            }
          ]
        }
      }
    ]
  }
}

Now I also understand that Newtonsoft's product is extensible because they specifically talk about how you can write your own custom serializer for specific data types, which would be exactly what I'd want here. However, they don't have any good code examples on how to do this.

If we (the SO community) can figure this out, technically by using the above format we should be able to serialize ANY subclass of List (or its derivatives/similar objects) provided they don't already have a property called Items (which IMHO would be a poor design in the first place since it would be confusing as crap!) Perhaps we can even get Newtonsoft to roll such a thing in their serializer natively!

So that said... anyone know how to customize the serializer/deserializer to treat this object differently?

M

Answer 1

Usually when I find myself fighting something like this it tells me I should consider another approach. In this case, I would recommend the following view model structure as an alternative:

public class Location
{
    public bool IsExpanded { get; set; }
    public string Name { get; set; }
    public List<Location> Locations { get; set; }
}

public class ViewModel
{
    public List<Location> RootLocations { get; set; }
}