Unused Local Variables (Visual Studio 2012)

Question

I'm ridding my code of all compiler warnings, as per my bosses request, when I came across some unused local variables. Naturally, I removed the ones which were legitimate, however I stumbled upon a couple which aren't as straight forward. (Variable names changed for security)

Dim strAAA As String = "aaaa" & strBBB & Now.ToString("yyyyMMddHHmmss") & ".doc"
If FUNCTION_NAME(strCCCC, strAAA) Then Return True

strAAA is allegedly an 'unused local variable' when it is clearly used directly below.

Even when I write it as follows:

Dim strAAA As String 
strAAA = "ViewLet" & strBBB & Now.ToString("yyyyMMddHHmmss") & ".doc"
If FUNCTION_NAME(strTmpFileName, strAAA) Then Return True

The warning is still present.

Can anybody solve this mystery?

Have you tried ["turning it off and on again"](https://www.youtube.com/watch?v=nn2FB1P_Mn8)? — Steven Doggart, Apr 02 '14 at 13:42
Probably there's some other error somewhere that is generating what you're seeying. Without seeing the complete code/and error message I doubt anyone will be able to help. — bastos.sergio, Apr 02 '14 at 13:43
I've found that if it is compiled with the warning active then later change it, the warning stays until it is re-compiled. — tinstaafl, Apr 02 '14 at 13:44
@bastos.sergio - All errors have been eradicated, leaving only this and other unused local variable warnings. This one is the first in the list. — Steve Borland, Apr 02 '14 at 14:05
@tinstaafl - I tried changing the unused local variable option to 'none', recompiling, setting back to warning and recompiling to no avail. — Steve Borland, Apr 02 '14 at 14:06
Have you tried a Clean and then a Rebuild? If that doesn't work, try deleting your bin and obj folders and then build it again. — Steven Doggart, Apr 02 '14 at 14:08

score 11 · Accepted Answer · answered Apr 02 '14 at 15:19

11

Solved it. There was a Return True about 50 lines above. This was always being hit, thus the variables were never being set.

Sloppy code from my predecessor I'm afraid!

answered Apr 02 '14 at 15:19

Steve Borland

360
3
12

1

Insult to injury: The blasted function wasn't even getting called! – Steve Borland Apr 02 '14 at 15:28
Re: "function wasn't even getting called" - you might be interested in using [FxCop](http://www.microsoft.com/en-us/download/details.aspx?id=6544) to have a check over your code. Or your version of VS might have the code analysis tools built in. – Andrew Morton Apr 02 '14 at 16:00

score 0 · Answer 2 · answered Apr 02 '14 at 14:33

0

Try eliminating the variable instance...

If FUNCTION_NAME(strTmpFileName, "ViewLet" & strBBB & Now.ToString("yyyyMMddHHmmss") & ".doc") Then Return True

answered Apr 02 '14 at 14:33

bastos.sergio

6,684
4
26
36

Unused Local Variables (Visual Studio 2012)

2 Answers2