/// <summary>
/// Returns the directory information for the specified path string.
/// </summary>
/// <param name="path">The path of a file or directory.</param>
/// <returns>Directory information for path, or <see langword="null"/>, if path denotes a root directory or is <see langword="null"/>.</returns>
public static string GetDirectoryName(string path)
{
// Get the full path without the long path prefix.
path = LongPathCommon.RemoveLongPathPrefix(LongPathCommon.NormalizePath(path));
int lastSeparatorIndex = path.LastIndexOfAny(new[] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar });
if (lastSeparatorIndex == -1)
{
return(null);
}
// Return null for root directories.
if (path.Length == 3 && path.EndsWith(@":\", StringComparison.OrdinalIgnoreCase))
{
return(null);
}
if (path.StartsWith(@"\\", StringComparison.OrdinalIgnoreCase) && lastSeparatorIndex <= 2)
{
return(null);
}
string result = path.Substring(0, lastSeparatorIndex);
// Append directory separator for root directories.
if (result.EndsWith(":", StringComparison.OrdinalIgnoreCase))
{
return(result + Path.DirectorySeparatorChar);
}
return(result);
}
/// <summary>
/// Converts the specified <paramref name="hr"/> to a corresponding the managed exception type.
/// </summary>
/// <param name="hr">Error code.</param>
/// <param name="path">Path to a file or directory.</param>
/// <returns>Managed exception for the <paramref name="hr"/> given.</returns>
internal static Exception GetExceptionForHr(int hr, string path)
{
string pathWithoutPrefix = LongPathCommon.RemoveLongPathPrefix(path);
Exception nativeException = Marshal.GetExceptionForHR(hr);
switch (hr)
{
case NativeMethods.ErrorFileNotFound:
return(new FileNotFoundException(string.Format(CultureInfo.InvariantCulture, "File not found: {0}", pathWithoutPrefix), nativeException));
case NativeMethods.ErrorPathNotFound:
return(new DirectoryNotFoundException(string.Format(CultureInfo.InvariantCulture, "Path not found: {0}", pathWithoutPrefix), nativeException));
case NativeMethods.ErrorAccessDenied:
return(new UnauthorizedAccessException(string.Format(CultureInfo.InvariantCulture, "Access denied to the path: {0}", pathWithoutPrefix), nativeException));
case NativeMethods.ErrorFilenameExcedRange:
return(new PathTooLongException(string.Format(CultureInfo.InvariantCulture, "Path is too long: {0}", pathWithoutPrefix), nativeException));
case NativeMethods.ErrorInvalidDrive:
return(new DriveNotFoundException(string.Format(CultureInfo.InvariantCulture, "Drive not found: {0}", pathWithoutPrefix), nativeException));
case NativeMethods.ErrorOperationAborted:
return(new OperationCanceledException(string.Format(CultureInfo.InvariantCulture, "Operation aborted: {0}", pathWithoutPrefix), nativeException));
case NativeMethods.ErrorInvalidName:
return(new ArgumentException(string.Format(CultureInfo.InvariantCulture, "Invalid name: {0}", pathWithoutPrefix), nativeException));
case NativeMethods.ErrorDirNotEmpty:
return(new IOException(string.Format(CultureInfo.InvariantCulture, "Directory is not empty: {0}", pathWithoutPrefix), hr));
case NativeMethods.ErrorFileExists:
return(new IOException(string.Format(CultureInfo.InvariantCulture, "File already exists: {0}", pathWithoutPrefix), hr));
}
// If we don't know about the error code, rely on the Marshal results.
return(nativeException);
}
/// <summary>
/// Updates the current class' properties.
/// </summary>
private void UpdateProperties()
{
this.DirectoryName = LongPathCommon.RemoveLongPathPrefix(LongPathCommon.GetDirectoryName(this.NormalizedPath));
}
