Repeated serialization and deserialization creates duplicate items

Question

Hi everyone i have a problem with my json serealization. I'm using the Json.NET package under Unity: I'm searching to make a Database, editable on my application and stored on my server through wwwForm and a php file. I have no problem to create it and to push it on the net. The problem is, when i load it, the database has a new entry at the end. The Database Class is this: ``` public class Database { public List armies { get; set;} public Database() { armies = new List(); armies.Add (new Army()); } } public class Army { public string faction { get; set;} public List army { get; set;} public Army() { faction = "RED"; army = new List(); army.Add (new Unit()); } } public class Unit { public string name { get; set;} public float fissionTimer { get; set;} public float HP { get; set;} public int shield { get; set;} public float strenght { get; set;} public float movSpeed { get; set;} public float attackSpeed { get; set;} public float farmAggro { get; set;} public in…

Accepted Answer

The reason this is happening is due to the combination of two things:

- Your class constructors automatically add default items to their respective lists. Json.Net calls those same constructors to create the object instances during deserialization.

- Json.Net's default behavior is to reuse (i.e. add to) existing lists during deserialization instead of replacing them.

To fix this, you can either change your code such that your constructors do not automatically add default items to your lists, or you can configure Json.Net to replace the lists on deserialization rather than reusing them. The latter by can be done by changing the `ObjectCreationHandling` setting to `Replace` as shown below:

```
JsonSerializerSettings settings = new JsonSerializerSettings();
settings.ObjectCreationHandling = ObjectCreationHandling.Replace;

var database = JsonConvert.DeserializeObject<Database>(www.text, settings);
```

Repeated serialization and deserialization creates duplicate items

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