This may work, but not too maintainable.

<UserControl.Triggers>
<EventTrigger RoutedEvent="FrameworkElement.Loaded">
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames BeginTime="0:0:0" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Red" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</UserControl.Triggers>

If you going to make DependencyProperty, you can inherit from current properties

public static readonly DependencyProperty OrientationProperty =
VirtualWrapPanel.OrientationProperty.AddOwner(typeof(VirtualWrapPanelView));

Then Bind them in Xaml. Regards Joseph Leung

QuickZip

The proper syntax :

public class MainControl : UserControl {
public SubControl Sub1 {get; set;}
}

<bbb:MainControl x:Name="abc">
<bbb.MainControl.Sub1>
<SubControl x:Name="Sub1" Property1="5" Property2="Hello" />
</bbb.MainControl.Sub1>
</bbb:MainControl>

If you want to change it in run time you have to use Trigger. For more information, please read WPF: A Beginner's Guide - Part 1 of n[^] Regards Joseph Leung

QuickZip

There may be better method, but I think this should work : You can create a ListViewItem template, so when it's last item (specify in your underlying model, or use TemplateSelector), occupy more space but not focusable. Something like the following :

<DataTemplate x:Key="NormalColumn1Template" >
<TextBlock Text="{Binding Text}" />
</DataTemplate>

<DataTemplate x:Key="LastColumn1Template" >
<StackPanel Orientation="Vertical">
<TextBlock Text="{Binding Text}" />
<TextBlock Text="FreeSpace" Height="100" IsHitTestVisible="False" IsFocusable="False" Background="White" />
</StackPanel>
</DataTemplate>

Regards Joseph Leung

QuickZip

Greetings Sorry I assumed your code has error in it :) as Abhinav S said, there are no leaks, if you checked Bitmap.GetHbitmap() in MSDN you can find more information about the leak. Thanks for posting your code, I just learnt that I can set SourceStream in BitmapImage directly, but I believe my code use less memory and faster however (Bitmap vs Bitmap + MemoryStream). Regards Joseph Leung

QuickZip

Greetings, I am not sure about Icon, but I used your code and loaded a png without problem.

BitmapImage bi = new BitmapImage();
MemoryStream stream = new MemoryStream();
Bitmap bmp = new Bitmap(@"C:\Temp\Test.png");
bi.BeginInit();
bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
stream.Seek(0, SeekOrigin.Begin);
bi.StreamSource = stream;
bi.EndInit();
AppIcon = bi;

Check if it's the problem for loading Icon (try load a bmp or png). I suggest the loading code should be placed in MyObject, your BitmapImage may be created by different thread as MyObject. Regards Joseph Leung

QuickZip

Source does not accept Icon and Bitmap object, you have to convert it into BitmapImage. The code below is a converter to convert Bitmap to BitmapImage, the code below can convert Bitmap to propert BitmapImage.

[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);
public static BitmapSource loadBitmap(Bitmap source)
{
try
{
IntPtr hBitmap = source.GetHbitmap();
//Memory Leak fixes, for more info : http://social.msdn.microsoft.com/forums/en-US/wpf/thread/edcf2482-b931-4939-9415-15b3515ddac6/
try
{
return Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
}
finally
{
DeleteObject(hBitmap);
}
}
catch
{
return new BitmapImage();
}

    }

Regards Joseph Leung

QuickZip

I have no idea about the datagrid, but did you Virtualized your ListView? e.g.

<ListView
VirtualizingStackPanel.IsVirtualizing="True"
VirtualizingStackPanel.VirtualizationMode="Recycling"
...
/>QuickZip

So you want a simple way, try this one : http://karlshifflett.wordpress.com/2007/11/10/over-reaction-to-a-simple-wpf-explorer-tree/[^] I am sure it will end up even more complex though. :laugh:

QuickZip

Have you tried WritableBitmap? you can return a empty WritableBitmap, start a thread to load your URI, then when the loading is finished, update it back through Dispatcher : writeBitmap.Dispatcher.Invoke(DispatcherPriority.Background, new ThreadStart(delegate { //UI Thread Int32Rect outRect = new Int32Rect(0, (int)(writeBitmap.Height - height) / 2, width, height); writeBitmap.WritePixels(outRect, bits, stride, 0); })); Thats what I did for my FileToIconConverter.

QuickZip

Is this what you wanted?

I hope you found this useful : private void Windows_Loaded(object sender, RoutedEventArgs e) { AddHandler(Hyperlink.ClickEvent, (RoutedEventHandler)Hyperlink_Click); } private void Hyperlink_Click(object sender, RoutedEventArgs e) { if (e.OriginalSource is Hyperlink) { Process.Start((e.OriginalSource as Hyperlink).NavigateUri.AbsoluteUri); e.Handled = true; } }