Windows Phone 实用开发技巧（27）：创建透明Tile

I have talked about how to create custom Live Tile in 《Windows Phone 实用开发技巧（17）：自定义应用程序的Tile》. Today let’s dig a little bit deeper.
What do you see in this image shown below ?
 

Do you see the same tile with different background called accent color in windows phone . So how can we create such tile . One simplest way is we replace ApplicationIcon.png with a transparent png file. But as we know it is just main tile of our app. Can we create own tile since we can pin what we want to start ?
Yes, we can do that. All we need to do is to create a transparent png file and save it to Isolated.
Maybe you have already know, we can save jpg file to Iso with following code:
WriteableBitmap bit = new WriteableBitmap();
bit.SaveJpeg(stream, 480, 800, 0, 100);
or
Extensions.SaveJpeg(WriteableBitmap, stream, 480, 800, 0, 100);
But jpg can not be transparent. So we need some extra library to help us create transparent png images. Here I use the famous open souce ImageTools.
We can use two differernt ways to dynamic create images. One way I have post here.
//add encoder for png image
Encoders.AddEncoder<PngEncoder>();
 
StandardTileData std = new StandardTileData
{
    BackgroundImage = new Uri(CreateBackground()),
    Title = "Tile Test",
    BackTitle = "Secondary",
    BackBackgroundImage = new Uri(CreateBackground())
};
ShellTile.Create(new Uri("/MainPage.xaml?type=1", UriKind.Relative), std);
sw.Stop();
Debug.WriteLine("Tranditonal method took time :" + sw.ElapsedMilliseconds);
Here is CreateBackground method looks like:
public static string CreateBackground()
{
    Grid grid = new Grid
    {
        Background = new ImageBrush
        {
            ImageSource = new BitmapImage
            {
                UriSource = new Uri("/mangTile;component/Images/1.png", UriKind.Relative),
                CreateOptions = BitmapCreateOptions.IgnoreImageCache
            }
        },
        Width = 173,
        Height = 173
    };
    TextBlock tb = new TextBlock
    {
        Text = "Hello world",
        Foreground = new SolidColorBrush(Colors.Red),
        FontSize = 32,
    };
    grid.Children.Add(tb);
    grid.Arrange(new Rect(0d, 0d, 173, 173));
    WriteableBitmap wbmp = new WriteableBitmap(grid, null);
 
    ExtendedImage extendImage = wbmp.ToImage();
 
    using (var store = IsolatedStorageFile.GetUserStoreForApplication())
    {
        if (!store.DirectoryExists(tiledirectory))
        {
            store.CreateDirectory(tiledirectory);
        }
        using (var stream = store.OpenFile(fullPath, System.IO.FileMode.OpenOrCreate))
        {
            extendImage.WriteToStream(stream, fullPath);
        }
    }
    return "isostore:/" + fullPath;
}
And as we run it we can see what shown below:
 


Another way is just render it within ImageOpened event:
public static void CreateTile(Uri imageUri, string temperature, string timeOfDay)
{
    var source = new BitmapImage(imageUri)
        {
            CreateOptions = BitmapCreateOptions.IgnoreImageCache,
        };
   
    string fullPath = tiledirectory + @"/" + timeOfDay + ".png";
 
    // This is important. The image can't be rendered before it's loaded.
    source.ImageOpened += (sender, e) =>
    {
        // Create our image as a control, so it can be rendered to the WriteableBitmap.
        var cloudImage = new Image { Source = source, Width = 173, Height = 173 };
 
        // TextBlock for the time of the day.
        TextBlock tbTemperature = new TextBlock
        {
            Text = temperature + '°',
            FontSize = 36,
            Foreground = new SolidColorBrush(Colors.White),
            FontFamily = new FontFamily("Segoe WP"),
        };
 
        using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
        {
            if (

补充：移动开发 , Windows Phone ,