SerializedProperty of Generics

Hi!

Finally, it seems that we can create custom inspectors for generic classes in Unity 2020.1.

I'm trying to create a custom inspector with the UI Toolkit for a GenericDictionary<,>. So far, everything works beautifully. I can create dictionaries with:

Code (CSharp):

1. GenericDictionary<string, int> dictionary = new GenericDictionary<string, int>();

And my custom editor renders it without issues.

The problem comes when I create a dictionary with a List or an array item as a Key or Value. For example, this:

Code (CSharp):

1. GenericDictionary<string, List<int>> dictionary = new GenericDictionary<string, List<int>>();

Doesn't work.

Unfortunately, I can't share the full source of the Visual Element, as it's owned by my company, but I can share the piece of the code that actually fails:

This is part of the GenericDictionary class (i'm just adding a few utility methods and the keys and value lists and that's it):

Code (CSharp):

1. [Serializable]
2.     public class GenericDictionary<TKey, TValue> : IDictionary<TKey, TValue>, ISerializationCallbackReceiver
3. {
4.         [SerializeField] List<TKey> keys = new List<TKey>();
5.         [SerializeField] List<TValue> values = new List<TValue>();
6.         ...
7.         ...
8.         ...
9. }

And this is the code that creates the VisualElements to render the dictionary.

Code (CSharp):

1. public static VisualElement CreateDictionary(SerializedProperty property, PropertyDrawer drawer)
2.         {
3.             if (property != null)
4.             {
5.                 var keys = property.FindPropertyRelative("keys");
6.                 var values = property.FindPropertyRelative("values"); // This returns null if the "values" property is a List.
7.                 if (keys != null && values != null)
8.                 {
9.                     ...
10.                 }
11.                 ...
12.             }
13.             ...
14. }

The "property.FindPropertyRelative" part returns null if the keys or values are Lists or Arrays.

Do you know how could I fix that?

 

Hi there Araj, did you ever figure out the issue?