Is this case sensitive?

John Riker

I have a routine that loops thru a bunch of files on my hard drive and does some things to them and saves them to another format. In my app config file I have:

<add key="extensionstest" value=".mp4,.mov,.avi,.mpg,.wmv,.mkv,.m4v,.ts" />

In my code I have:

foreach (string file in Directory.EnumerateFiles(rootfolder, "*.*", searchOption)
.Where(s => extensions.Any(ext => ext == Path.GetExtension(s))))

If a file is .mpg it processes it but noticing .MPG is being ignored or seems to unless something else is going on. Is the above even being on Windows case sensitive?

Thanks.

2 Replies

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Sachin Singh5y ago
Accepted answer
Extension in general is not case sensitive and holds same meaning mp4 and MP4 are same.
But inside where condition compilar doesn't know about file extension what he knows is only that he has to compare two string which is obviously case sensitive.
so you are getting right result due to where condition. so use ToLower()
foreach (string file in Directory.EnumerateFiles(rootfolder, "*.*", searchOption)
.Where(s => extensions.Any(ext => ext.ToLower() == Path.GetExtension(s).ToLower())))
Kiran Mohanty5y ago
Hi ,

You can use string comparison by ignoring case , in where condition like below

ext.Equals(Path.GetExtension(s), StringComparison.OrdinalIgnoreCase)))