Silverlight 4 WriteableBitmap ScaleTransform Exception but was working in v3

Silverlight 4 WriteableBitmap ScaleTransform Exception but was working in v3

I am getting the following exception for code that used to work in silverlight 3 but has stopped working since upgrading to silverlight 4:

System.AccessViolationException was unhandled Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

namespace SilverlightApplication1 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();         }          private void button1_Click(object sender, RoutedEventArgs e)         {             var OpenFileDialog = new OpenFileDialog();             OpenFileDialog.Filter = "*.jpg|*.jpg";              if (OpenFileDialog.ShowDialog() == true)             {                 var file = OpenFileDialog.Files.ToArray()[0];                 ScaleStreamAsBitmap(file.OpenRead(), 200);             }         }          public static WriteableBitmap ScaleStreamAsBitmap(Stream file, int maxEdgeLength)         {             file.Position = 0;             var src = new BitmapImage();             var uiElement = new System.Windows.Controls.Image();             WriteableBitmap b = null;             var t = new ScaleTransform();              src.SetSource(file);             uiElement.Source = src;              //force render             uiElement.Effect = new DropShadowEffect() { ShadowDepth = 0, BlurRadius = 0 }; ;              //calc scale             double scaleX = 1;             double scaleY = 1;             if (src.PixelWidth > maxEdgeLength)                 scaleX = ((double)maxEdgeLength) / src.PixelWidth;             if (src.PixelHeight > maxEdgeLength)                 scaleY = ((double)maxEdgeLength) / src.PixelHeight;             double scale = Math.Min(scaleX, scaleY);             t.ScaleX = scale;             t.ScaleY = scale;              b = new WriteableBitmap(uiElement, t);              return b;         }     } } 

Thanks

Answers & Comments...

Answer: 1

I had the same problem and I succeeded to resolve it!

b=new new WriteableBitmap(0, 0); b.SetSource(file); b.Render( new Image() { Source = src, Effect = new DropShadowEffect() { ShadowDepth = 0, BlurRadius = 0 } }, new ScaleTransform() { ScaleX = scaleX , ScaleY = scaleY }); 

And you can remove :uiElement and file.Position!

by : user367031http://stackoverflow.com/users/367031

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