Win8开发技术点积累（一）

VS11下载地址：

http://www.microsoft.com/click/services/Redirect2.ashx?CR_CC=200098114

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 VerticalAlignment="Bottom" HorizontalContentAlignment="Stretch" Height="88" VerticalContentAlignment="Stretch" Background="#E5058AE6" Visibility="Collapsed"> 后台代码： 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 files = await openPicker.PickMultipleFilesAsync();//获取文件

//显示文件

foreach (StorageFile v in files)

{

lv.Items.Add(v.Path);

}