如何清空c＃xaml metro风格的目录？

Question

i have this c# code and i want to delete a certain sub directory in Documents Library. However this produces an error because the directory is not empty. I hope someone can guide me on how to do this.

thank you for any prompt reply.

StorageFolder storageFolder = KnownFolders.DocumentsLibrary;              
var queryResult = storageFolder.CreateFolderQuery();
IReadOnlyList<StorageFolder> folderList = await queryResult.GetFoldersAsync();

 foreach (StorageFolder folder in folderList)
    {
       await folder.DeleteAsync();             
    }

Answer 1

You could use the StorageFolder.GetFilesAsync() to obtain a list of all the files present in the folders and delete them prior to deleting the folders since there is no way in the DeleteAsync() method to specify subfolders and files.

More info: StorageFolder class | MSDN

Answer 2

Hope this may help.

 public async void deletefile()
        {
            StorageFolder sourceFolder =  ApplicationData.Current.TemporaryFolder;
           // sourceFolder = await sourceFolder.GetFolderAsync("Test");
           // await sourceFolder.DeleteAsync(StorageDeleteOption.PermanentDelete);


          // var files = await sourceFolder.GetFilesAsync();

           IReadOnlyList<StorageFile> folderList = await sourceFolder.GetFilesAsync();
            if (folderList.Count > 0)
            {
                foreach (StorageFile f1 in folderList)
                {

                    await f1.DeleteAsync(StorageDeleteOption.PermanentDelete);
                }
            }

           //StorageFile retfile = await ApplicationData.Current.TemporaryFolder.GetFileAsync("MysoundFile.mp3");
           // if (retfile != null)
           // {
           //     await retfile.DeleteAsync(StorageDeleteOption.PermanentDelete);
           // }


        }