C# Newb while for raycast?

Unity Engine
1

I am new to C# and am trying to create a method to cast and check a raycasthit, using a while(). Is this possible? I would prefer while over update since it is not every frame.

My code is like this…

	/////3
	/////HANDLE GUN FIRE   		   	
	void determineTrajectory(){		   			
		castRay();
	}	
	IEnumerator castRay(){			
		print("7" + Time.time);
		while(btnPressed){
			if(Physics.Raycast(bulletRay, out bulletHit, Mathf.Infinity, bulletLayerMask)){
				Debug.DrawRay(bPt, bulletTrajectory, Color.green);
				print("8");
				yield return null;
			}
		}	
	}

This issue is that print(“7” + Time.time)" on line 7 is never called. What am I doing wrong?

2

Line 4 should be:

StartCoroutine (castRay ());
3

Of course!
Thanks.