While循环C＃/ asp.net MVC应用程序中的FormatException

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?

Answer 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.