FormatException in while loop c#/asp.net mvc application

Question

What is the problem with this conditional loop:

 while (System.IO.File.Exists(relPath)){ ... }

It trows an exception when it starts:

Exception Details: System.FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list

The relPath string value is a "/Temp/pdfs/file.ext". Any help?

Is that line 605? If so, your build is probably out of date. — SLaks
– SLaks, Commented Feb 3, 2013 at 1:20
What's the StackTrace in the exception? (not the call stack where the debugger stopped) Also, please don't HTML-escape code on SO; see stackoverflow.com/editing-help#code — SLaks
– SLaks, Commented Feb 3, 2013 at 1:21
@SLaks I´ll fix my post, Line 605 is the catch part of the try catch exception. "trow e". What you mean my build is out of date? — Guilherme Longo
– Guilherme Longo, Commented Feb 3, 2013 at 1:25
Never write throw e; it destroys the stack trace. (which is why you have no idea what the problem is here) Instead, write throw;, or get rid of the stack trace entirely. — SLaks
– SLaks, Commented Feb 3, 2013 at 3:56

FrostyFire · Accepted Answer · 2013-02-03 01:14:42Z

1

The System.FormatException is thrown because a substitution marker was not found in the argument list. If more arguments were provided, the program would not throw an exception.

My answer is copied from here, which provides sample code and shows the simple fix.

answered Feb 3, 2013 at 1:14

FrostyFire

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1 Comment

Guilherme Longo Over a year ago

It is a while condition.... does not make sense. It is a function that returns true if file exist or false in case it does not.

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