资料

http://msdn.microsoft.com/zh-cn/library/windows/apps/windows.ui.xaml.media.animation.discretedoublekeyframe(v=win.10).aspx

 

 

http://msdn.microsoft.com/zh-cn/library/windows/apps/jj710186.aspx 

 

NG4HW-VH26C-733KW-K6F98-J8CK4

vs YKCW6-BPFPF-BT8C9-7DCTH-QXGWC

 

用到快捷浏览图片，需要用到网络请求并显示实时显示网络请求的进度，采用了BitmapImage:
如下：
http://xamlspy.com/
var bitmapImage = new BitmapImage(new Uri(this.URL, UriKind.Absolute));
bitmapImage.DownloadProgress += bitmapImage_DownloadProgress;

void bitmapImage_DownloadProgress(object sender, DownloadProgressEventArgs e)
{
     progressBar.Value = e.Progress;
}

e.Progress就是网络请求图片的进度值。

 

 

Show.XAML

           <Viewbox x:Name="viewBox"   HorizontalAlignment="Left"  Width="1366" Margin="0,0,0,-52"  Grid.RowSpan="2" SizeChanged="viewBox_SizeChanged">
            <GridView x:Name="gvShow" BorderThickness="10" BorderBrush="Black" HorizontalAlignment="Left" Grid.Row="1"  Width="1366" Margin="0,5,0,0" Height="708" SelectionMode="None">
                <GridView.ItemTemplate>
                    <DataTemplate>
                        <Grid Tapped="Grid_Tapped_1"  >                         
                             <StackPanel>
                                <Image x:Name="imgSmall" Width="400"  HorizontalAlignment="Left" Grid.Row="1"  Source="{Binding ImageSmall}" Stretch="UniformToFill"/>
                            </StackPanel>
                            
                            <ScrollViewer x:Name="scrollViewer"  BorderThickness="0"   HorizontalAlignment="Center" ZoomMode="Enabled" MaxZoomFactor="20" HorizontalScrollMode="Enabled" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden">
                            <StackPanel>
                                <Image x:Name="imgBig" Visibility="Collapsed" HorizontalAlignment="Left" Grid.Row="1"  Source="{Binding ImageBig}" Stretch="UniformToFill"/>
                            </StackPanel>
                            </ScrollViewer>
                        </Grid>
                    </DataTemplate>
                </GridView.ItemTemplate>        
            </GridView>
        </Viewbox>

　　Show.XAML.CS

async private void Open()
        {
            ObservableCollection<ImageItem> imageItemListBig = new ObservableCollection<ImageItem>();
            ObservableCollection<ImageItem> imageItemListSmall = new ObservableCollection<ImageItem>();
            FileOpenPicker openPicker = new FileOpenPicker();
            openPicker.ViewMode = PickerViewMode.Thumbnail;
            openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            openPicker.FileTypeFilter.Add(".jpg");
            openPicker.FileTypeFilter.Add(".gif");
            openPicker.FileTypeFilter.Add(".png");
            openPicker.FileTypeFilter.Add(".bmp");

            var fileList = await openPicker.PickMultipleFilesAsync();

            if (fileList.Count > 0)
            {
                foreach (var item in fileList)
                {
                   
                    //缩略图
                    using (StorageItemThumbnail thumbnail = await item.GetThumbnailAsync(ThumbnailMode.PicturesView, IMAGESIZE, ThumbnailOptions.ResizeThumbnail))
                    {
                        if (null != thumbnail)
                        {
                            ImageItem imageItemSmall = new ImageItem();
                            imageItemSmall.ImageSmall.SetSource(thumbnail);
                            imageItemListSmall.Add(imageItemSmall);
                        }
                    }                                      

                 }            
            }

              gvShow.ItemsSource = imageItemListSmall;
        }

　　ImageIteam.cs

public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

          

 //缩略图
        private BitmapImage _ImageSmall = new BitmapImage();
        public BitmapImage ImageSmall
        {
            get
            {
                return _ImageSmall;
            }
            set
            {
                if (_ImageSmall != value)
                {
                    _ImageSmall = value; this.OnPropertyChanged("ImageSmall");
                }
            }
        }

 

        //缩略图
        public void SetImageSmall(String path)
        {
            ImageSmall = new BitmapImage(new Uri(path));
        }

基于tim heuer最新提供的方法

他相关post的地址：
http://timheuer.com/blog/archive/2012/08/07/updated-how-to-using-sqlite-from-windows-store-apps.aspx

以下是实践过程：

step 1:创建一个metro工程

step 2:在工具，选择扩展与更新中，选择联机(online),在搜索框内输入sqlite

将会发现一个叫做sqlite for window runtime的玩意儿，点击安装



step 3:在引用中，选择windows,扩展，把Mircosoft visual c++ runtime package以及sqlite for windows runtime二者勾选上


勾选Mircosoft visual c++ runtime package是作者推荐，据说这样子才不会出问题。有兴趣的可以深究下原因。

step 4:
点选解决方案，选择属性，配置属性，将平台选择为对应的平台，暂时不支持any cpu



step 5:
点击工程，选择管理nuget包，在联机中搜索sqlite-net，点击安装


安装成功后会生成两个文件：SQLite.cs与SQLiteAsync

至此，就完成了sqlite的安装，下面提供一段简陋的测试代码：

using SQLite;

02

03	public MainPage()

04

{

05	this.InitializeComponent();

06

test();

07

}

08

09	private async void test()

10

{

11	SQLiteAsyncConnection conn = new SQLiteAsyncConnection("people");

12	await conn.CreateTableAsync<Person>();

13

14

}

15

16	Person.cs:

17

18	public class Person

19

{

20	[PrimaryKey, AutoIncrement]

21	public int Id { get; set; }

22

23	[MaxLength(30)]

24	public string Name { get; set; }

25

26	[MaxLength(30)]

27	public string Surname { get; set; }

28

29

}

如题， 在Win8种，想生成图片的缩略图，有什么方法呢。最好生成的是byte[],谢谢

StorageFile.GetThumbnailAsync
http://msdn.microsoft.com/zh-CN/ ... /apps/br227212.aspx
http://msdn.microsoft.com/en-us/ ... .thumbnailmode.aspx

 

网上找到的代码
BitmapImage bitmap = new BitmapImage();
        private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
            bitmap.SetSource(await GetResourceThumbnail("test.png", 190));
            img.Source = bitmap;
        }

        public async Task<IRandomAccessStream> GetResourceThumbnail(string path, uint size)
        {
            var file = await KnownFolders.PicturesLibrary.GetFileAsync(path).AsTask().ConfigureAwait(false);
            return await file.GetThumbnailAsync(ThumbnailMode.PicturesView, size, ThumbnailOptions.UseCurrentScale).AsTask().ConfigureAwait(false);
        }