// Write Stream（通过 StorageStreamTransaction 写）
private async void btnWriteStream2_Click(object sender, RoutedEventArgs e)
{
// 在指定的目录下创建指定的文件
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.DocumentsLibrary);
StorageFile storageFile = await storageFolder.CreateFileAsync("webabcdStream.txt", CreationCollisionOption.ReplaceExisting);
string textContent = "I am webabcd(StorageStreamTransaction)";
using (StorageStreamTransaction transaction = await storageFile.OpenTransactedWriteAsync())
{
using (DataWriter dataWriter = new DataWriter(transaction.Stream))
{
// 将字符串写入数据流
dataWriter.WriteString(textContent);
// 使用 StorageStreamTransaction 方式的话，调用 DataWriter 的 StoreAsync() 方法的作用是把数据写入临时文件
// 以本例为例，这个临时文件就是同目录下名为 webabcdStream.txt.~tmp 的文件。只要不调用 CommitAsync() 方法的话就会看到
// 返回值为写入数据的大小，需要通过此值更新 StorageStreamTransaction 中的 Stream 的大小
transaction.Stream.Size = await dataWriter.StoreAsync();
// 重命名临时文件
await transaction.CommitAsync();
lblMsg.Text = "写入成功";
}
}
}
// Write Stream（通过 IRandomAccessStream 写）
private async void btnWriteStream1_Click(object sender, RoutedEventArgs e)
{
// 在指定的目录下创建指定的文件
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.DocumentsLibrary);
StorageFile storageFile = await storageFolder.CreateFileAsync("webabcdStream.txt", CreationCollisionOption.ReplaceExisting);
string textContent = "I am webabcd(IRandomAccessStream)";
if (storageFile != null)
{
using (IRandomAccessStream randomStream = await storageFile.OpenAsync(FileAccessMode.ReadWrite))
{
using (DataWriter dataWriter = new DataWriter(randomStream))
{
// 将字符串写入数据流
dataWriter.WriteString(textContent);
// 将数据流写入文件
await dataWriter.StoreAsync();
lblMsg.Text = "写入成功";
}
}
}
}
private async void btnCopyFile_Click(object sender, RoutedEventArgs e)
{
// 用户选中的可移动存储
string folderName = (string)listBox.SelectedItem;
if (folderName != null)
{
StorageFolder removableDevices = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.RemovableDevices);
StorageFolder storageFolder = await removableDevices.GetFolderAsync(folderName);
// 复制包内文件到指定的可移动存储
StorageFile storageFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/hololens.jpg"));
try
{
await storageFile.CopyAsync(storageFolder, "hololens.jpg", NameCollisionOption.ReplaceExisting);
lblMsg.Text = "复制成功";
}
catch (Exception ex)
{
lblMsg.Text = ex.ToString();
}
}
}
private async void Button_Click(object sender, RoutedEventArgs e)
{
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.VideosLibrary);
//CopyAsync接收三个参数，保存文件夹，新的文件名，保存方式（重名是否替换）
await file.CopyAsync(storageFolder, "KnownFolder.jpg", NameCollisionOption.ReplaceExisting);
}
private async void btnReadStream_Click(object sender, RoutedEventArgs e)
{
// 在指定的目录下获取指定的文件
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.DocumentsLibrary);
StorageFile storageFile = await storageFolder.GetFileAsync("webabcdStream.txt");
if (storageFile != null)
{
using (IRandomAccessStream randomStream = await storageFile.OpenAsync(FileAccessMode.Read))
{
using (DataReader dataReader = new DataReader(randomStream))
{
ulong size = randomStream.Size;
if (size <= uint.MaxValue)
{
// 从数据流中读取数据
uint numBytesLoaded = await dataReader.LoadAsync((uint)size);
// 将读取到的数据转换为字符串
string fileContent = dataReader.ReadString(numBytesLoaded);
lblMsg.Text = "读取结果：" + fileContent;
}
}
}
}
}
/// <summary>
/// helper for all list by functions
/// </summary>
private async Task GroupByHelperAsync(QueryOptions queryOptions)
{
GroupedFiles.Clear();
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
StorageFolderQueryResult queryResult = picturesFolder.CreateFolderQueryWithOptions(queryOptions);
IReadOnlyList <StorageFolder> folderList = await queryResult.GetFoldersAsync();
foreach (StorageFolder folder in folderList)
{
IReadOnlyList <StorageFile> fileList = await folder.GetFilesAsync();
var newList = new List <string>();
newList.Add("Group: " + folder.Name + " (" + fileList.Count + ")");
GroupedFiles.Add(newList);
foreach (StorageFile file in fileList)
{
newList.Add(file.Name);
}
}
}
public async void testWritingFile()
{
//Uri myUri = new Uri("ms-appx:///file.txt");
//StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(myUri);
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null /* current user*/, KnownFolderId.PicturesLibrary);
const string filename = "SAMPLE.dat";
StorageFile sampleFile = null;
try
{
sampleFile = await storageFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
var dialog = new MessageDialog(String.Format("The file '{0} was created.", sampleFile.Name));
await dialog.ShowAsync();
}
catch (Exception ex)
{
// I/O errors are reported as exceptions.
var dialog = new MessageDialog(String.Format("Error creating the file {0}: {1}", filename, ex.Message));
await dialog.ShowAsync();
}
}
// 获取文件夹
private async void btnGetFolder_Click(object sender, RoutedEventArgs e)
{
lblMsg.Text = "";
// 获取当前用户的“图片库”的 StorageFolder 对象
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
// 获取“图片库”所包含的全部文件夹
IReadOnlyList <StorageFolder> folderList = await picturesFolder.GetFoldersAsync();
foreach (StorageFolder storageFolder in folderList)
{
lblMsg.Text += " " + storageFolder.Name;
lblMsg.Text += Environment.NewLine;
}
// 在当前 StorageFolder 下获取指定名字的 StorageFolder，不存在的话会抛出 FileNotFoundException 异常
try
{
await picturesFolder.GetFolderAsync("aabbcc");
}
catch (FileNotFoundException)
{
await new MessageDialog("在“图片库”中找不到名为“aabbcc”的文件夹").ShowAsync();
}
// 在当前 StorageFolder 下获取指定名字的 IStorageItem，不存在的话会也不会抛出 FileNotFoundException 异常，而是会返回 null
IStorageItem item = await picturesFolder.TryGetItemAsync("aabbcc");
if (item == null)
{
await new MessageDialog("在“图片库”中找不到名为“aabbcc”的文件夹或文件").ShowAsync();
}
}
// 获取文件夹和文件
private async void btnGetFolderFile_Click(object sender, RoutedEventArgs e)
{
lblMsg.Text = "";
// 获取当前用户的“图片库”的 StorageFolder 对象
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
// 获取“图片库”所包含的全部文件夹和文件
IReadOnlyList <IStorageItem> storageItems = await picturesFolder.GetItemsAsync();
foreach (IStorageItem storageItem in storageItems)
{
if (storageItem.IsOfType(StorageItemTypes.Folder)) // 是文件夹
{
StorageFolder storageFolder = storageItem as StorageFolder;
lblMsg.Text += "folder: " + storageFolder.Name;
lblMsg.Text += Environment.NewLine;
}
else if (storageItem.IsOfType(StorageItemTypes.File)) // 是文件
{
StorageFile storageFile = storageItem as StorageFile;
lblMsg.Text += "file: " + storageFile.Name;
lblMsg.Text += Environment.NewLine;
}
}
}
// 分组文件夹
private async void btnFolderGroup_Click(object sender, RoutedEventArgs e)
{
lblMsg.Text = "";
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
// 文件夹按月分组查询参数，其他多种分组方式请参见 CommonFolderQuery 枚举
CommonFolderQuery folderQuery = CommonFolderQuery.GroupByMonth;
// 判断一下 picturesFolder 是否支持指定的查询参数
if (picturesFolder.IsCommonFolderQuerySupported(folderQuery))
{
// 创建查询
StorageFolderQueryResult queryResult = picturesFolder.CreateFolderQuery(folderQuery);
// 执行查询
IReadOnlyList <StorageFolder> folderList = await queryResult.GetFoldersAsync();
foreach (StorageFolder storageFolder in folderList) // 这里的 storageFolder 就是按月份分组后的月份文件夹（当然，物理上并没有月份文件夹）
{
IReadOnlyList <StorageFile> fileList = await storageFolder.GetFilesAsync();
lblMsg.Text += storageFolder.Name + " (" + fileList.Count + ")";
lblMsg.Text += Environment.NewLine;
foreach (StorageFile file in fileList) // 月份文件夹内的文件
{
lblMsg.Text += " " + file.Name;
lblMsg.Text += Environment.NewLine;
}
}
}
}
// 新增一个下载任务
private async void btnAddDownload_Click(object sender, RoutedEventArgs e)
{
Uri sourceUri = new Uri("http://files.cnblogs.com/webabcd/Windows10.rar", UriKind.Absolute);
StorageFile destinationFile;
try
{
// 保存的目标地址（别忘了在 Package.appxmanifest 中配置好 <Capability Name="documentsLibrary" /> 和 .rar 类型文件的关联）
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.DocumentsLibrary);
destinationFile = await storageFolder.CreateFileAsync("Windows10.rar", CreationCollisionOption.GenerateUniqueName);
}
catch (Exception ex)
{
WriteLine(ex.ToString());
return;
}
BackgroundDownloader backgroundDownloader = new BackgroundDownloader();
// 任务成功后弹出指定的 toast 通知（类似的还有 SuccessTileNotification, FailureToastNotification, FailureTileNotification）
backgroundDownloader.SuccessToastNotification = GetToastNotification(sourceUri);
// 创建一个后台下载任务
DownloadOperation download = backgroundDownloader.CreateDownload(sourceUri, destinationFile);
// 处理并监视指定的后台下载任务
await HandleDownloadAsync(download, true);
}
private async void StartDownload_Click(object sender, RoutedEventArgs e)
{
// Reset the output whenever a new download attempt begins.
DownloadedInfoText.Text = "";
DownloadedStatusText.Text = "";
rootPage.NotifyUser("", NotifyType.StatusMessage);
Uri source;
if (!Uri.TryCreate(serverAddressField.Text.Trim(), UriKind.Absolute, out source))
{
rootPage.NotifyUser("Invalid URI.", NotifyType.ErrorMessage);
return;
}
string destination = fileNameField.Text.Trim();
if (string.IsNullOrWhiteSpace(destination))
{
rootPage.NotifyUser("A local file name is required.", NotifyType.ErrorMessage);
return;
}
StorageFolder picturesLibrary = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
StorageFile destinationFile;
try
{
destinationFile = await picturesLibrary.CreateFileAsync(destination, CreationCollisionOption.GenerateUniqueName);
}
catch (Exception ex)
{
rootPage.NotifyUser($"Error while creating file: {ex.Message}", NotifyType.ErrorMessage);
return;
}
BackgroundDownloader downloader = new BackgroundDownloader();
download = downloader.CreateDownload(source, destinationFile);
// Opt into "random access" mode. Transfers configured this way have full support for resumable URL updates.
// If the timestamp or file size of the updated URL is different from that of the previous URL, the download
// will restart from scratch. Otherwise, the transfer will resume from the same position using the new URL.
//
// Due to OS limitations, downloads that don't opt into "random access" mode will always restart from scratch
// whenever their URL is updated.
download.IsRandomAccessRequired = true;
if (configureRecoverableErrorsCheckBox.IsChecked.Value)
{
// Declare HTTP 403 (WebErrorStatus.Forbidden) as a recoverable error.
download.RecoverableWebErrorStatuses.Add(WebErrorStatus.Forbidden);
}
DownloadedInfoText.Text = $"Downloading to {destinationFile.Name}, {download.Guid}";
// Start the download and wait for it to complete.
await HandleDownloadAsync();
}
private async void CopyFileButton_Click(object sender, RoutedEventArgs e)
{
StorageFile file = rootPage.sampleFile;
if (file != null)
{
try
{
StorageFolder picturesLibrary = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
StorageFile fileCopy = await file.CopyAsync(picturesLibrary, "sample - Copy.dat", NameCollisionOption.ReplaceExisting);
rootPage.NotifyUser(String.Format("The file '{0}' was copied and the new file was named '{1}'.", file.Name, fileCopy.Name), NotifyType.StatusMessage);
}
catch (FileNotFoundException)
{
rootPage.NotifyUserFileNotExist();
}
catch (Exception ex)
{
// I/O errors are reported as exceptions.
rootPage.NotifyUser(String.Format("Error copying file '{0}': {1}", file.Name, ex.Message), NotifyType.ErrorMessage);
}
}
else
{
rootPage.NotifyUserFileNotExist();
}
}
private async Task WriteFileTxt(List <Point> list, string filename)
{
// create file
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
try
{
StorageFile file = await storageFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
if (file != null)
{
try
{
// string userContent = InputTextBox.Text;
//StatusMessage.Text = list.Count.ToString();
if (list.Count != 0)
{
String userContent = "";
for (int i = 0; i < list.Count; i++)
{
String line = String.Format("{0}, {1}, {2}, {3}, {4}, {5}", list.ElementAt(i).accX.ToString(),
list.ElementAt(i).accY.ToString(), list.ElementAt(i).accZ.ToString(), list.ElementAt(i).gyX.ToString(),
list.ElementAt(i).gyY.ToString(), list.ElementAt(i).gyZ.ToString());
userContent += line + Environment.NewLine;
}
await FileIO.WriteTextAsync(file, userContent);
// rootPage.NotifyUser(String.Format("The following text was written to '{0}':{1}{2}", file.Name, Environment.NewLine, userContent), NotifyType.StatusMessage);
}
else
{
StatusMessage.Text = "The list is empty, please collect something and then click 'Write' again.";
}
}
catch (FileNotFoundException)
{
StatusMessage.Text = "File not exit";
}
catch (Exception ex)
{
// I/O errors are reported as exceptions.
StatusMessage.Text = ex.Message;
// rootPage.NotifyUser(String.Format("Error writing to '{0}': {1}", file.Name, ex.Message), NotifyType.ErrorMessage);
}
}
else
{
StatusMessage.Text = "File not exit";
}
// rootPage.NotifyUser(String.Format("The file '{0}' was created.", rootPage.sampleFile.Name), NotifyType.StatusMessage);
}
catch (Exception ex)
{
// I/O errors are reported as exceptions.
// NotifyUser(String.Format("Error creating file '{0}': {1}", MainPage.filename, ex.Message), NotifyType.ErrorMessage);
StatusMessage.Text = ex.Message;
}
// writefile
}
private async void CreateTestFile()
{
StorageFolder folder = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
await folder.CreateFileAsync("Test " + Extension + " file." + Extension, CreationCollisionOption.ReplaceExisting);
await Windows.System.Launcher.LaunchFolderAsync(folder);
}
private async void CreateFileButton_Click(object sender, RoutedEventArgs e)
{
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
rootPage.sampleFile = await storageFolder.CreateFileAsync(MainPage.filename, CreationCollisionOption.ReplaceExisting);
rootPage.NotifyUser(String.Format("The file '{0}' was created.", rootPage.sampleFile.Name), NotifyType.StatusMessage);
}
private async Task<IStorageFile> CreateResultFileAsync(int id)
{
StorageFolder picturesLibrary = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
IStorageFile resultFile = await picturesLibrary.CreateFileAsync(
String.Format(CultureInfo.InvariantCulture, "picture{0}.png", id),
CreationCollisionOption.GenerateUniqueName);
return resultFile;
}
// Create Folder
private async void CreateFolder()
{
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
_myFolder = await picturesFolder.CreateFolderAsync("MyFolder", CreationCollisionOption.OpenIfExists);
// Tips: Another alternative way
// _myFolder = await picturesFolder.CreateFolderAsync(@"MyFolder\sub\subsub", CreationCollisionOption.OpenIfExists);
}
public async Task <List <Point> > ReadFileTxt(string filename)
{
//string fullPath = Path.GetFullPath(filename);
string[] lines;
string content;
List <Point> model = new List <Point>();
StorageFolder picturesLibrary = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
StorageFile file = (StorageFile)await picturesLibrary.TryGetItemAsync(filename);
if (file == null)
{
// If file doesn't exist, indicate users to use scenario 1
// NotifyUser(String.Format("The file '{0}' does not exist. Use scenario one to create this file.", filename), NotifyType.ErrorMessage);
StatusMessage.Text = "File not found";
}
else
{
try
{
StatusMessage.Text = "reading";
content = await FileIO.ReadTextAsync(file);
// StatusMessage.Text = "1";
lines = content.Split('\n');
// StatusMessage.Text = "2";
for (int i = 0; i < lines.Count(); i++)
{
string[] args = lines[i].Split(',', ' ', '\t');
Point newPoint = new Point();
//newPoint.accX = Double.Parse(args[0]);
//newPoint.accY = Double.Parse(args[1]);
//newPoint.accZ = Double.Parse(args[2]);
//newPoint.gyX = Double.Parse(args[3]);
//newPoint.gyY = Double.Parse(args[4]);
//newPoint.gyZ = Double.Parse(args[5]);
newPoint.setAccelerometter(double.Parse(args[0], CultureInfo.InvariantCulture), double.Parse(args[1], CultureInfo.InvariantCulture), double.Parse(args[2], CultureInfo.InvariantCulture));
newPoint.setGyroscope(double.Parse(args[3], CultureInfo.InvariantCulture), double.Parse(args[4], CultureInfo.InvariantCulture), double.Parse(args[5], CultureInfo.InvariantCulture));
model.Add(newPoint);
}
// StatusMessage.Text = "3";
}
catch (FileNotFoundException)
{
//rootPage.NotifyUserFileNotExist();
StatusMessage.Text = "File not found";
}
catch (Exception ex)
{
// I/O errors are reported as exceptions.
//rootPage.NotifyUser(String.Format("Error reading from '{0}': {1}", file.Name, ex.Message), NotifyType.ErrorMessage);
StatusMessage.Text = ex.Message;
}
}
return(model);
}
// 创建文件夹
private async void btnCreateFolder_Click(object sender, RoutedEventArgs e)
{
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
_myFolder = await picturesFolder.CreateFolderAsync("MyFolder", CreationCollisionOption.OpenIfExists);
// 创建文件夹时也可以按照下面这种方式创建多级文件夹
// _myFolder = await picturesFolder.CreateFolderAsync(@"MyFolder\sub\subsub", CreationCollisionOption.OpenIfExists);
lblMsg.Text = "创建了文件夹";
}
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
// 获取“图片库”目录下的所有根文件
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
IReadOnlyList <StorageFile> fileList = await picturesFolder.GetFilesAsync();
listBox.ItemsSource = fileList.Select(p => p.Name).ToList();
base.OnNavigatedTo(e);
}
/// <summary>
/// Checks if sample file already exists, if it does assign it to sampleFile
/// </summary>
internal async void ValidateFile()
{
StorageFolder picturesLibrary = await KnownFolders.GetFolderForUserAsync(null /* current user */, KnownFolderId.PicturesLibrary);
sampleFile = (await picturesLibrary.TryGetItemAsync(filename)) as StorageFile;
if (sampleFile == null)
{
// If file doesn't exist, indicate users to use scenario 1
NotifyUserFileNotExist();
}
}
private async void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// 用户选中的文件
string fileName = (string)listBox.SelectedItem;
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
StorageFile storageFile = await picturesFolder.GetFileAsync(fileName);
// 显示文件的缩略图
await ShowThumbnail(storageFile);
}
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
// 获取全部可移动存储
StorageFolder removableDevices = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.RemovableDevices);
IReadOnlyList <StorageFolder> folderList = await removableDevices.GetFoldersAsync();
listBox.ItemsSource = folderList.Select(p => p.Name).ToList();
base.OnNavigatedTo(e);
}
private async void btnWriteText_Click(object sender, RoutedEventArgs e)
{
// 在指定的目录下创建指定的文件
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.DocumentsLibrary);
StorageFile storageFile = await storageFolder.CreateFileAsync("webabcdText.txt", CreationCollisionOption.ReplaceExisting);
// 在指定的文件中写入指定的文本
string textContent = "I am webabcd";
await FileIO.WriteTextAsync(storageFile, textContent, Windows.Storage.Streams.UnicodeEncoding.Utf8); // 编码为 UnicodeEncoding.Utf8
lblMsg.Text = "写入成功";
}
private async void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// 用户选中的文件夹
string folderName = (string)listBox.SelectedItem;
StorageFolder picturesFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
StorageFolder storageFolder = await picturesFolder.GetFolderAsync(folderName);
// 显示文件夹的各种属性
ShowProperties1(storageFolder);
await ShowProperties2(storageFolder);
await ShowProperties3(storageFolder);
}
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
// 在指定的目录下创建指定的文件
StorageFolder documentsFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.DocumentsLibrary);
StorageFile storageFile = await documentsFolder.CreateFileAsync("webabcdCacheAccess.txt", CreationCollisionOption.ReplaceExisting);
// 在指定的文件中写入指定的文本
string textContent = "I am webabcd";
await FileIO.WriteTextAsync(storageFile, textContent, Windows.Storage.Streams.UnicodeEncoding.Utf8);
base.OnNavigatedTo(e);
}
private async void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// 用户选中的可移动存储
string folderName = (string)listBox.SelectedItem;
StorageFolder removableDevices = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.RemovableDevices);
StorageFolder storageFolder = await removableDevices.GetFolderAsync(folderName);
// 用户选中的可移动存储中的根目录下的文件和文件夹总数
IReadOnlyList <IStorageItem> storageItems = await storageFolder.GetItemsAsync();
lblMsg.Text = "items count: " + storageItems.Count;
}
private async void btnWriteBinary_Click(object sender, RoutedEventArgs e)
{
// 在指定的目录下创建指定的文件
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.DocumentsLibrary);
StorageFile storageFile = await storageFolder.CreateFileAsync("webabcdBinary.txt", CreationCollisionOption.ReplaceExisting);
// 将字符串转换成二进制数据，并保存到指定文件
string textContent = "I am webabcd";
IBuffer buffer = ConverterHelper.String2Buffer(textContent);
await FileIO.WriteBufferAsync(storageFile, buffer);
lblMsg.Text = "写入成功";
}
private async void playSound(String name)
{
MediaElement PlayMusic = new MediaElement();
// StorageFolder Folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
StorageFolder storageFolder = await KnownFolders.GetFolderForUserAsync(null, KnownFolderId.PicturesLibrary);
//Folder = await Folder.GetFolderAsync("MyFolder");
//StorageFile sf = await Folder.GetFileAsync("aaa.mp3");
StorageFile sf = await storageFolder.TryGetItemAsync(name) as StorageFile;
//oof.mp3 is in Pictures
PlayMusic.SetSource(await sf.OpenAsync(FileAccessMode.Read), sf.ContentType);
PlayMusic.Play();
}