Question

I have a Windows Forms app, that has a single ElementHost containing a WPF UserControl… in my WPF, I have a VERY simple ListView:

<ListView Margin='4' ItemsSource='{Binding Notifications}'>     <ListView.View>         <GridView>             <GridViewColumn Header='FirstName' DisplayMemberBinding='{Binding FirstName}' />             <GridViewColumn Header='LastName' DisplayMemberBinding='{Binding LastName}' />             <GridViewColumn Header='Address' DisplayMemberBinding='{Binding Address}' />             <GridViewColumn Header='City' DisplayMemberBinding='{Binding City}' />             <GridViewColumn Header='State' DisplayMemberBinding='{Binding State}' />             <GridViewColumn Header='Zip' DisplayMemberBinding='{Binding Zip}' />         </GridView>     </ListView.View> </ListView> 

If my source has 10 items, the form loads in less than one second. If my source has 1000 items, it takes 7 seconds!!! My timer is ONLY taking the loading into account (not how much time it takes to get the items).

So my question is:

Is using an ElementHost a performance nightmare?

Is WPF DataBinding a performance nightmare?

Is the ListView a piece of crap? (btw, same results with the WPFToolkit’s DataGrid)?

Answer 1

Use virtualization

<ListView ItemsSource='{BindingNames}'Name='lv'>             <ListView.ItemsPanel>                 <ItemsPanelTemplate>                    <!--<StackPanel/>                     If StackPanel was used, the memory consumed was over 2GB and dead slow.                     -->                    <VirtualizingStackPanel>                     <!--Memory footprint is only 200 mb-->                     </VirtualizingStackPanel>                 </ItemsPanelTemplate>             </ListView.ItemsPanel>             <ListView.ItemTemplate>                 <DataTemplate>                     <TextBlock Text='{Binding}'/>                 </DataTemplate>             </ListView.ItemTemplate>         </ListView>