1

I started getting this error as soon as i make my code into a dll.

Argument #' cannot convert null' expression to type UnityEngine.Vector2'

I did not tget this error when my code was just a c# script.

Okay here is a before and after synopsis.

Initially I had a regular c# script named ScriptA in my unity project .

This is ScriptA

    namespace MyScript
    {
        public class ScriptA
        {



            public void MethodA(Rect rect, int i, Vector2 position = new Vector2())
            {

            }

        }
    }

I then use ScriptA.MethodA , and as you see , the Vector2 parameter is marked as = new Vector2() .awesome.

55489-ne1.jpg

I then moved ScriptA to a Class Library and made a dll out of it . Place the dll into my unity project.
it wors , the clases are accessed, However for some reason as you see in this picture the Vector2 parameter in MethodA sa marked as = null even though in the dll it is set to = new Vector2

55488-ne15.jpg

2

Default parameters always were a bit problematic in Unity. However I’ve never seen this behaviour. It’s probably the best to do what Unity does with most of it’s own defaul parameter methods: Just declare an overload

public void MethodA(Rect rect, int i, Vector2 position)
{
    // your actual method
}

// overload without the  Vector2 parameter
public void MethodA(Rect rect, int i)
{
    MethodA(rect, i, Vector3.zero);
}