Memory leak problem in Thumb control


  • I think I have detected a new problem with memory leak in Silverlight 4. Now, this new problem has been detected in Thumb control.

    I have created a new Silverlight 4 application with three pages:
    - MainPage: With a content control, and three buttons. The first button load the Page1 in the content control. The second button load the Page 2 in the content control. And the last button will call ten times to GC.Collect() and GC.WaitForPendingFinalizers().
    - Page1: Empty page.
    - Page2:



        <Grid x:Name="LayoutRoot" Background="Pink" Width="400" Height="400">

    <Thumb x:Name="myThumbStart"


    Code behind:


        public partial class DualSlider3 : UserControl

    public DualSlider3()

    private void myThumbStart_DragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e)
    double newMarginLeft = myThumbStart.Margin.Left + e.HorizontalChange;

    if ((newMarginLeft >= 0) && (this.LayoutRoot.ActualWidth > (newMarginLeft + myThumbStart.ActualWidth)))
    myThumbStart.Margin = new Thickness(newMarginLeft, 0, 0, 0);


    If I load the Page2 and I move the Thumb control doing drag with mouse from left side to right side several times, when I load the Page1 and press GC button, the Page2 (and all its content) is not removed from memory. I checked it with WinDbg.

    Can anybody test this problem?

    Monday, May 10, 2010 6:09 AM

All replies

  • Its exactly the same bug which I already posted here. It affects nearly every drag & drop operation. Hope we get an answer this time...

    Tuesday, May 11, 2010 10:00 AM