获取根存储文件夹中的所有存储文件以及所有子存储文件夹中的所有项目

Question

Surely there is a simple way of getting all files within a folder and all sub-folders in UWP? I can't seem to find any examples of it anywhere. Below is my implementation which loops through loops for a finite amount of subfolders but it is a bit ridiculous and prone to error.

var libraryFolder = await StorageApplicationPermissions.FutureAccessList.GetFolderAsync("UserLibrary");


var subFoldersLayer1 = await libraryFolder.GetFoldersAsync();

                    var rootFiles = await libraryFolder.GetFilesAsync();

                    List<StorageFile> allFiles = new List<StorageFile>();
                    IEnumerable<StorageFile> allFilesForScanning = new List<StorageFile>();

                    foreach (var _file in rootFiles)
                    {
                        itemsFoundCounter++;
                        if (itemsFound != null)
                        {
                            itemsFound.Report(itemsFoundCounter);
                        }

                        allFiles.Add(_file);
                    }

                    foreach (var subFolderLayer1 in subFoldersLayer1)
                    {
                        var subFoldersLayer2 = await subFolderLayer1.GetFoldersAsync();
                        IReadOnlyList<StorageFile> files = await subFolderLayer1.GetFilesAsync();

                        foreach (var file in files)
                        {
                            itemsFoundCounter++;
                            if (itemsFound != null)
                            {
                                itemsFound.Report(itemsFoundCounter);
                            }

                            allFiles.Add(file);
                        }

                        foreach (var subFolderLayer2 in subFoldersLayer2)
                        {
                            var subFoldersLayer3 = await subFolderLayer2.GetFoldersAsync();
                            files = await subFolderLayer2.GetFilesAsync();

                            foreach (var file in files)
                            {
                                itemsFoundCounter++;
                                if (itemsFound != null)
                                {
                                    itemsFound.Report(itemsFoundCounter);
                                }

                                allFiles.Add(file);
                            }
// Goes on like this for a bit...

Answer 1

I figured it out

 private async Task GetAllFiles(StorageFolder folder, List<StorageFile> allFiles, IProgress<int> itemsFound)
    {
        foreach (StorageFile file in await folder.GetFilesAsync())
        {
            if (file.FileType == ".ext")
            {
                allFiles.Add(file);

                if (itemsFound != null)
                {
                    itemsFound.Report(itemsFoundCounter);
                }
            }
        }

        foreach (StorageFolder subfolder in await folder.GetFoldersAsync())
        {
            await GetAllFiles(subfolder, allFiles, itemsFound);
        }
    }