How can I replace this code?

 guiTexChild.pixelInset = SetResolution(guiTexChild.pixelInset);

This is the line of code I want to replace. I tried to do something like this

 guiTexChild.rectTransform.position = new Vector3(SetResolution(guiTexChild.rectTransform.rect).x,SetResolution(guiTexChild.rectTransform.rect).y);

But I don't think this does the same thing . Does anyone know to solve this?