/// <summary>
/// Example that will run freely and the app will be unresponsive which
/// is how many developers approach reading folders and only try with a smaller
/// folder structure but larger structures will freeze the app thus we
/// need to consider an asynchronous method.
/// </summary>
/// <param name="path">Folder to work with</param>
/// <param name="indentLevel">Indent level for display with Console.WriteLine</param>
public static void RecursiveFolders(string path, int indentLevel)
{
try
{
if ((File.GetAttributes(path) & FileAttributes.ReparsePoint) != FileAttributes.ReparsePoint)
{
foreach (var folder in Directory.GetDirectories(path))
{
OnTraverseEvent?.Invoke(folder);
Console.WriteLine($"{new string(' ', indentLevel)}{Path.GetFileName(folder)}");
RecursiveFolders(folder, indentLevel + 2);
}
}
}
catch (UnauthorizedAccessException unauthorized)
{
OnExceptionEvent?.Invoke(unauthorized);
}
}
public static async Task RecursiveFolders(DirectoryInfo directoryInfo, string[] excludeFileExtensions, CancellationToken ct)
{
if (!directoryInfo.Exists)
{
OnTraverseEvent?.Invoke("Nothing to process");
return;
}
if (!excludeFileExtensions.Any(directoryInfo.FullName.Contains))
{
await Task.Delay(1, ct);
OnTraverseEvent?.Invoke(directoryInfo.FullName);
}
else
{
OnTraverseExcludeFolderEvent?.Invoke(directoryInfo.FullName);
}
DirectoryInfo folder = null;
try
{
await Task.Run(async() =>
{
foreach (DirectoryInfo dir in directoryInfo.EnumerateDirectories())
{
folder = dir;
if ((folder.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden ||
(folder.Attributes & FileAttributes.System) == FileAttributes.System ||
(folder.Attributes & FileAttributes.ReparsePoint) == FileAttributes.ReparsePoint)
{
OnTraverseExcludeFolderEvent?.Invoke($"* {folder.FullName}");
continue;
}
if (!Cancelled)
{
await Task.Delay(1);
await RecursiveFolders(folder, excludeFileExtensions, ct);
}
else
{
return;
}
if (ct.IsCancellationRequested)
{
ct.ThrowIfCancellationRequested();
}
}
}, ct);
}
catch (Exception ex)
{
if (ex is OperationCanceledException)
{
Cancelled = true;
}
else if (ex is UnauthorizedAccessException)
{
UnauthorizedAccessExceptionEvent?.Invoke($"Access denied '{ex.Message}'");
}
else
{
OnExceptionEvent?.Invoke(ex);
}
}
}