I haven't really done much exception handling before (fairly new to coding) and I'm unsure about where I need to catch exceptions and where there should be no exceptions to catch.
Specifically, I'm wondering about iterating through lists. Should I catch a Null Reference Exception everywhere that I loop through a list?
I'm thinking the answer is No since I have unit tests which test code that loops through a list and they do not throw an exception when the list has no elements.
So, I'm wondering. How do I know when I should catch a Null Reference Exception for looping through a list and when it is unnecessary?
There will be no NullReferenceException
if your list is empty. You can iterate over empty containers just fine.
If there is a chance that your container itself is null
you should check this with a simple if
before you loop. It might be a good practice to not let it become null
in the first place though. Fail early in that case and throw an ArgumentNullException
if you get a container that you expect to be not null
instead of trying to come to terms with the fact that it is null
.
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