How can I listen for input from all joystick axes through c sharp code?

I am setting up a handy dynamic controller mapping screen for my game. I have set it up perfectly for mapping any button on any plugged in controller, but I can't find out how to listen for ALL joystick axes. One potential solution is for me to manually map out every single axis in the InputManager and then listen for each axis by name that way, but I want to do something that doesn't rely on the InputManger. Buttons were a piece of cake, but the joysticks are proving to be more tricky.