Environment.GetEnvironmentVariable("windir") strange behavior

Question

The line is

if (!val.Contains(Environment.GetEnvironmentVariable("windir")))

Which seems to work just fine with a Windows 7(64-bit) system and will detect whether the string I'm looking at contains any version of c:\windows with any capitalization. But under XP, the same code does not seem to detect the changes in case. I have all the results printing to the console for debugging and some c:\WINDOWS are getting through, but when I execute

echo %windir%

in the Command window, I get C:\WINDOWS. Is there a way to rewrite my test so that it doesn't break compatibility with Win7 but will catch these differences with XP?

Thanks

Answer 1

I'd recommend using this instead to get the windows folder:

var windowsPath = Environment.GetFolderPath(Environment.SpecialFolder.Windows)

And you can do this for case-insensitive comparison:

if (val.IndexOf(windowsPath, StringComparison.InvariantCultureIgnoreCase) < 0)