C# Filepath Recasing

Question

I\'m trying to write a static member function in C# or find one in the .NET Framework that will re-case a file path to what the filesystem specifies.

Example:

<

Answer 1

The answer by @Ants above should absolutely get credit as the accepted answer. However, I refactored it a bit to my purposes. The approach is packaged as extension methods for FileInfo and DirectoryInfo, and return corrected ones as well.

public static DirectoryInfo GetProperCasedDirectoryInfo(this DirectoryInfo dirInfo)
{
    // Inspired by http://stackoverflow.com/a/479198/244342

    if (!dirInfo.Exists)
    {
        // Will not be able to match filesystem
        return dirInfo;
    }

    DirectoryInfo parentDirInfo = dirInfo.Parent;
    if (parentDirInfo == null)
    {
        return dirInfo;
    }
    else
    {
        return parentDirInfo.GetProperCasedDirectoryInfo().GetDirectories(dirInfo.Name)[0];
    }
}

public static FileInfo GetProperCasedFileInfo(this FileInfo fileInfo)
{
    // Inspired by http://stackoverflow.com/a/479198/244342

    if (!fileInfo.Exists)
    {
        // Will not be able to match filesystem
        return fileInfo;
    }

    return fileInfo.Directory.GetProperCasedDirectoryInfo().GetFiles(fileInfo.Name)[0];
}

I've been banging my head over some case-inconsistency issues with FileInfo. In order to ensure robustness, I convert to all caps when doing comparison or storage of the paths. To clarify the intent of the code, I also have these extension methods:

public static string GetPathForKey(this FileInfo File)
{
    return File.FullName.ToUpperInvariant();
}

public static string GetDirectoryForKey(this FileInfo File)
{
    return File.DirectoryName.ToUpperInvariant();
}