與眾不同windows phone (13)

Background Task（背景工作）之後台檔案傳輸（上傳和下載）

介紹

與眾不同 windows phone 7.5 (sdk 7.1) 之背景工作

後台檔案傳輸（下載）

後台檔案傳輸（上傳）

樣本

1、示範如何?後台檔案傳輸（下載）

BackgroundTransferDownload.xaml

<phone:PhoneApplicationPage      x:Class="Demo.BackgroundTask.BackgroundTransferDownload"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"    FontFamily="{StaticResource PhoneFontFamilyNormal}"    FontSize="{StaticResource PhoneFontSizeNormal}"    Foreground="{StaticResource PhoneForegroundBrush}"    SupportedOrientations="Portrait" Orientation="Portrait"    mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480"    shell:SystemTray.IsVisible="True">        <Grid x:Name="LayoutRoot" Background="Transparent">         <StackPanel Orientation="Vertical">                            <Button x:Name="btnDownloadSilverlightDemo" Content="下載 Silverlight Demo 壓縮包" Click="btnDownloadSilverlightDemo_Click" />             <Button x:Name="btnDownloadXNADemo" Content="下載 XNA Demo 壓縮包" Click="btnDownloadXNADemo_Click" />             <Button x:Name="btnDownloadWindowsPhoneDemo" Content="下載 WindowsPhone Demo 壓縮包" Click="btnDownloadWindowsPhoneDemo_Click" />                <TextBlock Text="下載工作清單：" Margin="0 15 0 0" />             <ListBox Name="listBox">                 <ListBox.ItemTemplate>                     <DataTemplate>                         <Grid Margin="0 15" Width="480">                             <Grid.ColumnDefinitions>                                 <ColumnDefinition Width="8*"/>                                 <ColumnDefinition Width="2*"/>                             </Grid.ColumnDefinitions>                                                            <Grid>                                 <StackPanel Orientation="Vertical">                                     <StackPanel Orientation="Horizontal">                                         <TextBlock Text="檔案名稱: "/>                                         <TextBlock Text="{Binding Tag}"/>                                     </StackPanel>                                     <StackPanel Orientation="Horizontal">                                         <TextBlock Text="下載狀態: "/>                                         <TextBlock Text="{Binding TransferStatus}" />                                     </StackPanel>                                     <StackPanel Orientation="Horizontal">                                         <TextBlock Text="已接收位元組數: "/>                                         <TextBlock Text="{Binding BytesReceived}" />                                     </StackPanel>                                     <StackPanel Orientation="Horizontal">                                         <TextBlock Text="總共位元組數: "/>                                         <TextBlock Text="{Binding TotalBytesToReceive}" />                                     </StackPanel>                                 </StackPanel>                                </Grid>                             <Grid Grid.Column="1">                                 <Button x:Name="btnCancel" Tag="{Binding RequestId}" Click="btnCancel_Click" Content="刪除任務"></Button>                             </Grid>                         </Grid>                     </DataTemplate>                 </ListBox.ItemTemplate>             </ListBox>                        </StackPanel>             </Grid>     </phone:PhoneApplicationPage>