Unity3D failing to execute Newtonsoft Json code

Question

I just updated the way my code loads a file:

string filename = Path.Combine(Data.BaseDir, "entities.txt");
if (File.Exists(filename))
{
   string tempJson = System.IO.File.ReadAllText(filename);
   var settings = new JsonSerializerSettings()
   {
      TypeNameHandling = TypeNameHandling.Objects
   };
   IList parsedEntities = (IList)JsonConvert.DeserializeObject<List<Entity>>(tempJson, settings);
   foreach (Entity e in parsedEntities)
   {
      //e.Initialise();
      Map.Get(e.Coord).Entity = e;
   }
}

This code compiles but then has a runtime exception in the Unity 5 editor. (log below) This code happens to be common with my editor which is a windows forms project and it runs fine when compiled by visual studio. My Newtonsoft.Json.dll says that it is version 7.

Is this a problem with the Unity compiler? Are certain parts of Newtonsoft Json DLL uncompatible with unities version of .Net? How should I write this to be compatible with Unity?

Log:

JsonSerializationException: Could not load assembly 'MO1Common'. Newtonsoft.Json.Serialization.DefaultSerializationBinder.GetTypeFromTypeNameKey (TypeNameKey typeNameKey) Newtonsoft.Json.Utilities.ThreadSafeStore2[Newtonsoft.Json.Serialization.DefaultSerializationBinder+TypeNameKey,System.Type].AddValue (TypeNameKey key) Newtonsoft.Json.Utilities.ThreadSafeStore2[Newtonsoft.Json.Serialization.DefaultSerializationBinder+TypeNameKey,System.Type].Get (TypeNameKey key) Newtonsoft.Json.Serialization.DefaultSerializationBinder.BindToType (System.String assemblyName, System.String typeName) Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ResolveTypeName (Newtonsoft.Json.JsonReader reader, System.Type& objectType, Newtonsoft.Json.Serialization.JsonContract& contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, System.String qualifiedTypeName) Rethrow as JsonSerializationException: Error resolving type specified in JSON 'MO1.Definitions.Entities.Charactor, MO1Common'. Path '[0].$type', line 1, position 57. Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ResolveTypeName (Newtonsoft.Json.JsonReader reader, System.Type& objectType, Newtonsoft.Json.Serialization.JsonContract& contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, System.String qualifiedTypeName) Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadMetadataProperties (Newtonsoft.Json.JsonReader reader, System.Type& objectType, Newtonsoft.Json.Serialization.JsonContract& contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, System.Object existingValue, System.Object& newValue, System.String& id) Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject (Newtonsoft.Json.JsonReader reader, System.Type objectType, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, System.Object existingValue) Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal (Newtonsoft.Json.JsonReader reader, System.Type objectType, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerMember, System.Object existingValue) Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList (IList list, Newtonsoft.Json.JsonReader reader, Newtonsoft.Json.Serialization.JsonArrayContract contract, Newtonsoft.Json.Serialization.JsonProperty containerProperty, System.String id)

Answer 1

I fixed this by adding this code:

#If Unity
tempJson = tempJson.Replace("MO1Common", "Assembly-CSharp")
#EndIf

This requires adding the IfDef "Unity" to the unity project.

The problem is that Json.Net was trying to reference the assembly library "MO1Common" which I had set up in visual studio, however, Unity compiles all of the classes in its "scripts" folder into one default assembly library called "Assembly-CSharp". Simply replacing the name of the assembly library in the Json string when the code is being compiled by Unity fixes this problem.