使用 getFilesAsync 和 getFoldersAsync 获取文件夹内的文件

Question

有这个

public IReadOnlyList<StorageFolder> folderList;

用它来做这个

folderList = await musicFolder.GetFoldersAsync(CommonFolderQuery.GroupByAlbum);

我应该拥有 Music 文件夹中的所有文件夹（musicFolder 是 knownfolders.musiclibrary）

但是当我在 cicle 里面时，我会尝试这样做

for (int i=0; i<folderList.Count; i++)
                    {
                        if (folderList[i].Name==(lbMusic_Albums.SelectedItem as songStruct).songName)
                        {

                            StorageFolder current = folderList[i];

                            IReadOnlyList<StorageFile> TempFileList = await current.GetFilesAsync(CommonFileQuery.OrderByName); //OTHER CODE

我在等待行系统参数异常..我不明白为什么，我是否正确传递它？

System.ArgumentException：值不在预期范围内。 在 Windows.Storage.StorageFolder.GetFilesAsync（CommonFileQuery 查询） 在 DUS.MainPage.d__31.MoveNext()

Answer 1

这样解决了:D

FolderLib = await musicFolder.GetFoldersAsync(CommonFolderQuery.GroupByAlbum);
//Obtaining all the folders and do for every folder this


 foreach(StorageFolder item in FolderLib)
 {  // Take the subfolder
     SubFolderlib = await item.GetFilesAsync();
    // and do stuff with it
 }

FolderLib 和 SubFolderLib 分别是

public IReadOnlyList<StorageFile> SubFolderlib;

public IReadOnlyList<StorageFolder> FolderLib;