Windows phone 7 将usercontrol呈现给MediaLibrary中的图像

这应该将MyUIElement的渲染保存为bmp，然后将其保存为medialibrary中的Jpeg格式，但我在使用

library.SavePicture（“证书”，流）的行中得到的
值不在预期范围内
错误

有什么想法吗？
我犯了和你一样的错误。我按照上面的例子解决了这个问题

因此，您的方法应该如下所示

private void SaveAsPicture_Click(object sender, RoutedEventArgs e)
{
    WriteableBitmap bmp = new WriteableBitmap(MyUIElement, null);
    var library = new MediaLibrary();
    MemoryStream stream = new MemoryStream();
    bmp.SaveJpeg(stream, 100, 100, 0, 90);
    library.SavePicture("Certificate", stream);
}

看到了吗？但它会显示在手机的照片库中吗？这个问题/答案显示了如何保存到隔离存储，我认为这可能是相关的。代码中的哪一行导致错误？library.SavePicture（“Certificate”，stream）；
private void SaveAsPicture_Click(object sender, RoutedEventArgs e)
{
    WriteableBitmap bmp = new WriteableBitmap(MyUIElement, null);
    library.SavePicture("Certificate", stream);
    String tempJPEG = "TempJPEG";

    // Create a virtual store and file stream. Check for duplicate tempJPEG files.
    var myStore = IsolatedStorageFile.GetUserStoreForApplication();
    if (myStore.FileExists(tempJPEG))
    {
        myStore.DeleteFile(tempJPEG);
    }

    IsolatedStorageFileStream myFileStream = myStore.CreateFile(tempJPEG);

    bmp.SaveJpeg(myFileStream, wb.PixelWidth, wb.PixelHeight, 0, 85);
    myFileStream.Close();

    // Create a new stream from isolated storage, and save the JPEG file to the media library on Windows Phone.
    myFileStream = myStore.OpenFile(tempJPEG, FileMode.Open, FileAccess.Read);

    // Save the image to the camera roll or saved pictures album.
    MediaLibrary library = new MediaLibrary();

        // Save the image to the camera roll album.
    library.SavePicture("Certificate", myFileStream);
}