Binary serialize class with FileAccess in c#

Moep Put the Testclass definition in its own source file named Testclass.cs

Moep Are you sure? The filename is case-sensitive. It must be exactly the same as class name.

DaveTheCoder Can you provide, or link to an example of saving and restoring binary data using resources? I experimented with that, but couldn't figure it out.

Just save it as *.res instead of *.tres. ResourceSaver determines the format according to extension.

class_name DeadParrot extends Resource
var pushing_up_the_daisies = true;

func _ready():
	var polly = DeadParrot.new()
	ResourceSaver.save(polly, "res://polly.res")
	ResourceSaver.save(polly, "res://polly.tres")

Regarding the OP. I tried to do the same in GDScript but also got some funky errors. Didn't have time to investigate further. Object serialization is always tricky so better play it safe and go with engine's preferred system - and that's resource objects/files.

Moep Yeah, for now i just serialize the properties one at a time with storevar() and then compose the class when loading back the simple property types.

No need to do it like this. It's error prone, tedious and non-scalable. Simply inherit the class from Resource and use ResourceSaver.Save() and ResourceLoader.Load() to (de)serialize the object.