Checking array fails each time. But change anything and resave and it works until unity closes......

Questions & Answers
1

Ok this has been killing me for hours. And to top it all off it is just an array! I thought the days of them being an issue was behind me but apparently not.

So here is the problem line:

tempInt = selectedDraft.sections[0].ataQuestions.Length;

Selected draft is a class with an array or another class sections. Inside each section is a series of questions (another class).

I just want to check if there are no questions in that section. This gives me the error:

NullReferenceException: Object reference not set to an instance of an object

I’m ok with it being null. But When I check it in this :

if (selectedDraft.sections [0].ataQuestions.Length != null) {
			foreach(AllThatApply obj in selectedDraft.sections[0].ataQuestions){
				//Doing stuff
			}
		}

It gives me the null exception on the foreach loop. Why would it get to that point with the null check beforehand?

The craziest thing is if I make ANY change (even add a comment) and save… IT WILL WORK. That is until I stop playing the game. Then it will fail until I save something at runtime again. Why the double standard? What am I missing?? I will be driving home after writing this but will respond to questions as soon as I can.

Thank you for you time, I know it was a long read.

2

do not check if ataQuestions.Length for nullness, check ataQuestions itself! because if its null, you cant access the Length property.

so instead of if (selectedDraft.sections[0].ataQuestions.Length != null)
use if (selectedDraft.sections[0].ataQuestions != null)