Getting referenced GUID from SerializedProperty

For whatever reason, I routinely have difficulty with some references getting unhooked when re-importing projects, or unity packages. I am unconcerned with that, because my workflow uses git and I don't save my entire project tree, just the files needed.

Anyway, I want to programmatically re-associate the broken references. I can see, in the .scene and .prefab raw files (if you open in a text editor) they have a "programSource" field with a GUID which references the correct GUID in the meta file for the associated asset. My thought is I can just force-re-associate them.

I want to get a copy of that GUID.

Code (csharp):

1.  
2.             var serializedUdon = new SerializedObject(brokenUdon);
3.             var property = serializedUdon.FindProperty("serializedProgramAsset");
4.             // property now contains the property, but .objectReferenceValue is null.
5.             // how can I get the GUID referenced here, and then look it up myself?
6.  

If I could get the GUID, I know I can use "AssetDatabase.GUIDToAssetPath" and "AssetDatabase.LoadAssetAtPath" to resolve the object.

 

Still curious about this - but was able to work around my underlying issue by reimporting the underlying prefab assets. Not sure why Unity gets so confused when it comes to assets.

 

Are you properly source-controlling the .meta files? They are not optional. The name of a file or class is NOT used to maintain connections in Unity. Only the GUID contained in the .meta file. Source control them.