Win8开发技术点积累（一）

　1 Win8 Metro下的MessageBox

 private async void No_But_Click(object sender, RoutedEventArgs e)
        {
            MessageDialog msg = new MessageDialog("你真的要确定退出你的应用吗？", "桂素伟提示");
            msg.Commands.Add(new UICommand("是", new UICommandInvokedHandler(this.CommandInvokedHandler)));
            msg.Commands.Add(new UICommand("否", new UICommandInvokedHandler(this.CommandInvokedHandler)));
            await msg.ShowAsync();
        }
        private void CommandInvokedHandler(IUICommand command)
        {                    
            this.Dispatcher.Invoke(Windows.UI.Core.CoreDispatcherPriority.Normal, (s, a) =>
            {
                UserName_TB.Text = command.Label;
            }, this, null);
        }

　　2 消除AppBar阻挡

　　后台代码：

<AppBar Name="pb"   VerticalAlignment="Bottom" HorizontalContentAlignment="Stretch" Height="88" VerticalContentAlignment="Stretch" 

Background="#E5058AE6" Visibility="Collapsed">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition/>
                    <ColumnDefinition/>
                </Grid.ColumnDefinitions>
                <StackPanel Grid.Column="1" Orientation="Horizontal"/>
                <StackPanel Orientation="Horizontal"/>
            </Grid>
        </AppBar>

protected override void OnRightTapped(RightTappedRoutedEventArgs e)
        {     
            if (!pb.IsOpen)
            {
                pb.Visibility = Visibility.Visible;
            }
            else
            {
                pb.Visibility = Visibility.Collapsed; 
            }
            base.OnRightTapped(e);              
        }

　　3 Image加载图片

　　img.Source = new BitmapImage(new Uri( "ms-appx:/Images/a.png", UriKind.RelativeOrAbsolute));

　　4 获取摄像头图片

 private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
 CameraCaptureUI camera = new CameraCaptureUI();
            camera.PhotoSettings.CroppedAspectRatio = new Size(1, 1);//比例    
            camera.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Png;//图片格式
            // dialog.PhotoSettings.CroppedSizeInPixels = new Size(100, 150);//固定大小        
            StorageFile file = await camera.CaptureFileAsync(CameraCaptureUIMode.Photo);
            if (file != null)
            {
                BitmapImage bitmapImage = new BitmapImage();
                using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
                {
                    bitmapImage.SetSource(fileStream);
                }
                img.Source = bitmapImage;
                aaa.Content = file.Path;
            }
}

　　5 获取摄像头视频

private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
            CameraCaptureUI dialog = new CameraCaptureUI();
            dialog.VideoSettings.Format = CameraCaptureUIVideoFormat.Mp4;
            StorageFile file = await dialog.CaptureFileAsync(CameraCaptureUIMode.Video);
            if (file != null)
            {               
                IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
                mediaelement.SetSource(fileStream,"video/mp4"); 
            }
        }

　　6 获取摄像头视频到程序中

  MediaCapture mediaCaptureMgr;    
        private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
            mediaCaptureMgr = new MediaCapture();
            await mediaCaptureMgr.InitializeAsync();
            Scenario1Video.Source = mediaCaptureMgr;
            await mediaCaptureMgr.StartPreviewAsync();    
        }

　　7 获取系统文件

FileOpenPicker openPicker = new FileOpenPicker();

 
            openPicker.ViewMode = PickerViewMode.List;//显示文件样式

 
            openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;//图片库为查找目标路径

 
            openPicker.FileTypeFilter.Add(".iso");         //查找文件类型

 
            IReadOnlyList<StorageFile> files = await openPicker.PickMultipleFilesAsync();//获取文件

 
            //显示文件

 
            foreach (StorageFile v in files)

 
            {

 
                lv.Items.Add(v.Path);

 
            }

 

原文地址: http://www.devdiv.com/Win8开发技术点积累（一）-thread-133322-1-8.html