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:

string filepath = @"C:\temp.txt"; filepath = FileUtility.RecaseFilepath(filepath);  // filepath = C:\Temp.TXT // Where the real fully qualified filepath in the NTFS volume is C:\Temp.TXT 

I've tried the following code below and many variants of it and it still doesn't work. I know Windows is case-insensitive in general but I need to pass these file paths to ClearCase which considers file path casing since it's a Unix and Windows application.

public static string GetProperFilePathCapitalization(string filepath) {     string result = "";      try     {         result = Path.GetFullPath(filepath);         DirectoryInfo dir = new DirectoryInfo(Path.GetDirectoryName(result));         FileInfo[] fi = dir.GetFiles(Path.GetFileName(result));         if (fi.Length > 0)         {             result = fi[0].FullName;         }     }     catch (Exception)     {         result = filepath;     }      return result; } 

Answer 1

This is a pretty simple implementation that assumes that the file and directories all exist and are accessible:

static string GetProperDirectoryCapitalization(DirectoryInfo dirInfo) {     DirectoryInfo parentDirInfo = dirInfo.Parent;     if (null == parentDirInfo)         return dirInfo.Name;     return Path.Combine(GetProperDirectoryCapitalization(parentDirInfo),                         parentDirInfo.GetDirectories(dirInfo.Name)[0].Name); }  static string GetProperFilePathCapitalization(string filename) {     FileInfo fileInfo = new FileInfo(filename);     DirectoryInfo dirInfo = fileInfo.Directory;     return Path.Combine(GetProperDirectoryCapitalization(dirInfo),                         dirInfo.GetFiles(fileInfo.Name)[0].Name); } 

There is a bug with this, though: Relative paths are converted to absolute paths. Your original code above did the same, so I'm assuming that you do want this behavior.