Win8 downlevels mp3

Front-end code: <Page. resources> <Style TargetType = "TextBlock"> <Setter Property = "FontSize" Value = "27"/> <Setter Property = "FontFamily" Value = ""/> </ style> </Page. resources> <Grid Background = "{StaticResource ApplicationPageBackgroundThemeBrush}"> <Grid. rowDefinitions> <RowDefinition Height = "auto"/> <RowDefinition Height = "*"/> </Grid. rowDefinitions> <StackPanel Grid. row = "0" Margin = "15, 8" Orientation = "Horizon Tal "> <TextBlock Text =" input download URI: "VerticalAlignment =" Center "/> <TextBox x: Name =" txtInputUri "Width =" 680 "/> <Button x: name = "btnDown" Margin = ", 0," VerticalAlignment = "Center" Content = "start downloading" Padding =, 17,5 "FontSize =" 22 "Click =" onDownload_Click "/> </StackPanel> <StackPanel Grid. row = "1" Margin = "20"> <ProgressBar x: name = "probar" Maximum = "100" Minimum = "0" SmallChange = "1" Width = "700" HorizontalAl Ignment = "Left" Foreground = "Yellow" Height = "30" Margin = "6, 21,"/> <TextBlock x: Name = "tbMsg" Margin = "6, 8, 0, 0 "/> </StackPanel> </Grid> </Page> background code: using System; using System. collections. generic; using System. IO; using System. linq; using Windows. foundation; using Windows. foundation. collections; using Windows. networking. backgroundTransfer; using Windows. storage; using Windows. storage. pickers; using Windows. UI. xaml; using Windows. UI. xaml. controls; using Windows. UI. xaml. controls. primitives; using Windows. UI. xaml. data; using Windows. UI. xaml. input; using Windows. UI. xaml. media; using Windows. UI. xaml. navigation; // "blank page" item template in http://go.microsoft.com/fwlink? On LinkId = 234238, the introduction namespace downLoad {/// <summary> /// can be used to itself or navigate to a blank page inside the Frame. /// </Summary> public sealed partial class MainPage: Page {public MainPage () {this. initializeComponent () ;}/// <summary> /// call when this page is to be displayed in the Frame. /// </Summary> /// <param name = "e"> describes how to access event data on this page. Parameter // properties are usually used on the configuration page. </Param> protected override void OnNavigatedTo (NavigationEventArgs e) {} private async void onDownload_Click (object sender, RoutedEventArgs e) {// determine whether the downloaded URI is input if your InputUri. text) return; // select the file storage location FileSavePicker picker = new FileSavePicker (); picker. fileTypeChoices. add ("MP3 file", new string [] {". mp3 "}); StorageFile file = await picker. pickSaveFileAsync (); if (File! = Null) {// instantiate BackgroundDownloader downloader = new BackgroundDownloader (); DownloadOperation operation = downloader. createDownload (new Uri(this.txt InputUri. text), file); // Progress SS <DownloadOperation> progressDown = new Progress <DownloadOperation> (this. progressChanged); // starts to download btnDown. isEnabled = false; var opresult = await operation. startAsync (). asTask (progressDown); bt NDown. IsEnabled = true; // determine the download result switch (opresult. Progress. Status) {case BackgroundTransferStatus. Completed: tbMsg. Text = "download Completed. "; Break; case BackgroundTransferStatus. Error: tbMsg. Text =" An Error occurred while downloading. "; Break; default: tbMsg. Text =" unknown. "; Break ;}}/// <summary >/// report progress /// </summary> private async void ProgressChanged (DownloadOperation op) {var p = op. progress; double t = p. totalBytesToReceive; // The total number of bytes to download. double d = p. bytesReceived; // number of received bytes // calculated percentage of completed bytes. double pc = d/t * 100; await Dispatcher. runAsync (Windows. UI. core. coreDispatcherPriority. normal, () => {this. probar. value = pc; this. tbMsg. text = string. format ("downloaded {0} Bytes/total {1} characters Section. ", D. ToString (" N0 "), t. ToString (" N0 "));});}}}