Convert a Canvas into a PDF via C# Script

Hello all! I'm trying to convert a canvas with different UI elements to a PDF via C# and save it to a location I specify. So first I tried with a screenshot and used ScreenCapture.CaptureScreenshot, but it doesn't work the way I want. Namely, the problem is that some of them are out of the field of view. How can I do this?

The canvas I need to convert looks like this: