/// <summary>
/// Returns an enumerable collection of files (including full paths) that match a pattern in a specified path,
/// and optionally searches subdirectories.
/// </summary>
/// <param name="directory">The directory to search.</param>
/// <param name="searchPattern">Search pattern to match against files in the directory.</param>
/// <param name="searchOption">Whether to search the top directory or subdirectories.</param>
/// <returns>An enumerable of filenames including paths.</returns>
public IEnumerable <string> EnumerateFiles(string directory, string searchPattern, SearchOption searchOption)
{
directory.ThrowIfNullOrWhiteSpace("directory");
searchPattern.ThrowIfNullOrWhiteSpace("searchPattern");
searchOption.ThrowIfInvalidEnumerand <SearchOption>("searchOption");
directory.ThrowIfDirectoryDoesNotExist("directory");
return(Directory.EnumerateFiles(directory, searchPattern, searchOption));
}
/// <summary>
/// Returns an enumerable collection of files (including full paths) that match a pattern in a specified path,
/// and optionally searches subdirectories.
/// </summary>
/// <param name="directory">The directory to search.</param>
/// <param name="searchPattern">Search pattern to match against files in the directory.</param>
/// <param name="searchOption">Whether to search the top directory or subdirectories.</param>
/// <returns>An enumerable of filenames including paths.</returns>
public IEnumerable <string> EnumerateFiles(string directory, string searchPattern, SearchOption searchOption)
{
directory.ThrowIfNullOrWhiteSpace("directory");
searchPattern.ThrowIfNullOrWhiteSpace("searchPattern");
searchOption.ThrowIfInvalidEnumerand <SearchOption>("searchOption");
if (!DirectoryExists(directory))
{
throw new DirectoryNotFoundException("The directory " + directory + " does not exist.");
}
Regex regex = MakeRegexFromSearchPattern(searchPattern);
var files = from filename in Files.Keys
where filename.StartsWith(directory) &&
filename.Length > directory.Length &&
(searchOption == SearchOption.AllDirectories || FileIsDirectlyInDir(filename, directory)) &&
(searchPattern == "*" || (regex != null && regex.IsMatch(filename)))
select filename;
return(files);
}
