Ignore folders/files when Directory.GetFiles() is denied access

Question

I am trying to display a list of all files found in the selected directory (and optionally any subdirectories). The problem I am having is that when the GetFiles() method co

Answer 1

A simple way to do this is by using a List for files and a Queue for directories. It conserves memory. If you use a recursive program to do the same task, that could throw OutOfMemory exception. The output: files added in the List, are organised according to the top to bottom (breadth first) directory tree.

public static List GetAllFilesFromFolder(string root, bool searchSubfolders) {
    Queue folders = new Queue();
    List files = new List();
    folders.Enqueue(root);
    while (folders.Count != 0) {
        string currentFolder = folders.Dequeue();
        try {
            string[] filesInCurrent = System.IO.Directory.GetFiles(currentFolder, "*.*", System.IO.SearchOption.TopDirectoryOnly);
            files.AddRange(filesInCurrent);
        }
        catch {
            // Do Nothing
        }
        try {
            if (searchSubfolders) {
                string[] foldersInCurrent = System.IO.Directory.GetDirectories(currentFolder, "*.*", System.IO.SearchOption.TopDirectoryOnly);
                foreach (string _current in foldersInCurrent) {
                    folders.Enqueue(_current);
                }
            }
        }
        catch {
            // Do Nothing
        }
    }
    return files;
}

Steps:

1. Enqueue the root in the queue
2. In a loop, Dequeue it, Add the files in that directory to the list, and Add the subfolders to the queue.
3. Repeat untill the queue is empty.