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

肯定有一种简单的方法来获取UWP中的文件夹和所有子文件夹中的所有文件吗？我似乎在任何地方都找不到它的任何示例。下面是我的实现，该实现循环了有限数量的子文件夹，但是有点荒谬并且容易出错。

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

我知道了

 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);
        }
    }