文件 – 实时图块不从孤立存储中拾取图像

当我创建实时图块图像时,我的问题是我的前景WP7应用程序中的点我也更新了实时图块(因为我知道某些内容已经改变,所以为什么要等待周期性任务).但是当在这里发生实时图块更新时,似乎找不到新创建的文件,因此呈现没有位图的实时图块.

就相关代码而言

创建文件

var source = new BitmapImage(new Uri("Images/Tiles/Class Timetable with T.png",UriKind.Relative));
source.CreateOptions = BitmapCreateOptions.None;
source.ImageOpened += (sender,e) => // This is important. The image can't be rendered before it's loaded.
{
    // Create our image as a control,so it can be rendered to the WriteableBitmap.
    var newImage = new Image();
    newImage.Source = source;
    newImage.Width = 173;
    newImage.Height = 173;

    // Define the filename for our tile. Take note that a tile image *must* be saved in /Shared/ShellContent
    // or otherwise it won't display.
    var tileImage = string.Format("/Shared/ShellContent/{0}.jpg",Event.UniqueId);

    // Define the path to the isolatedstorage,so we can load our generated tile from there.
    var isoStoreTileImage = string.Format("isostore:{0}",tileImage);

和实际保存本身

// Create a stream to store our file in.
var stream = store.CreateFile(tileImage);

// Invalidate the bitmap to make it actually render.
bitmap.Invalidate();

// Save it to our stream.
bitmap.SaveJpeg(stream,173,100);

// Close the stream,and by that saving the file to the ISF.
stream.Close();

以及实际检索图像并更新实时图块的代码(并且在周期性任务中工作但不在应用程序本身中工作

string imageString = "isostore:/Shared/ShellContent/" + nextEvent.UniqueId + ".jpg";
ShellTile defaultTile2 = ShellTile.ActiveTiles.First();
defaultTile2.Update(new StandardTileData
{
    Title = nextTime,BackgroundImage = (new Uri(imageString,UriKind.Absolute)),});

只是不确定我这里是否做了一些根本错误的事情？我正在考虑将生成的图像与其对象一起存储在数据库中.而且,我确实有一个可管理的文件数量.我没有产生数以百计的东西.

我有一个解决方法,即在不使用图像文件的情况下从WP7应用程序内更新livetile.