WPF

SledgeHammer01 wrote:

Even with 200 items you will see a huge difference.

SledgeHammer01 wrote:

Ask me how I know

SledgeHammer01 wrote:

I saw 200 items add about 50MB of memory when I turned virtualization off. Thats how I know

SledgeHammer01 wrote:

10 - 20 items realized vs. 200 items realized is a HUGE memory difference. Unless 50MB isn't considered "huge"

devvvy wrote:

VirtualizingStackPanel carries more overhead than a simple Grid/StackPanel.

private ObservableCollection<Directive> list;

void DerivedAttributePanel_Loaded(object sender,RoutedEventArgs e)
        {              
            list = new ObservableCollection<Directive>();
            list.Add(new Directive { DirectiveName = "Filter1", Description = "Description 1" });
            list.Add(new Directive { DirectiveName = "Filter2", Description = "Description 2" });
            list.Add(new Directive { DirectiveName = "Filter3", Description = "Description 3" });
           
            lbDirectiveList.ItemsSource = list;
         }

//Suppose you have a Button to add data
// No need of setting the ItemsSource again!
private void AddData_Click(object sender, RoutedEventArgs e)
{
 Directive newDirect = new Directive { DiretiveName = txtFilter.Text, Description = txtDesc.Text };
 list.Add(newDirect);
}

<ListBox ItemsSource="{Binding lbDirectiveList}" ItemTemplate="{StaticResource myDataTemplate}" />

<ListBox Name=" "...>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=DirectiveName}"/>
<TextBlock Text="{Binding Path=Description}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

dataset = new DNLMHDataSet(); // a designer-generated typed dataset
reportingUserAdapter = new ReportingUserTableAdapter();
reportingUserAdapter.Fill(dataset.ReportingUser);
listBoxSelectedReporting.DataContext = dataset;

?System.Windows.Data.CollectionViewSource.GetDefaultView(listBoxSelectedReporting.DataContext)
{System.Windows.Data.BindingListCollectionView}
    [System.Windows.Data.BindingListCollectionView]: {System.Windows.Data.BindingListCollectionView}
    CanFilter: false
    CanGroup: true
    CanSort: false
    Culture: null
    CurrentItem: {System.Data.DataViewManagerListItemTypeDescriptor}
    CurrentPosition: 0
    Filter: null
    GroupDescriptions: {System.Collections.ObjectModel.ObservableCollection<System.ComponentModel.GroupDescription>}
    Groups: null
    IsCurrentAfterLast: false
    IsCurrentBeforeFirst: false
    IsEmpty: false
    SortDescriptions: {System.ComponentModel.SortDescriptionCollection.EmptySortDescriptionCollection}
    SourceCollection: {System.Data.DataViewManager}

?(ListCollectionView)System.Windows.Data.CollectionViewSource.GetDefaultView(listBoxSelectedReporting.DataContext)
Cannot cast 'System.Windows.Data.CollectionViewSource.GetDefaultView(listBoxSelectedReporting.DataContext)' (which has an actual type of 'System.Windows.Data.BindingListCollectionView') to 'System.Windows.Data.ListCollectionView'

SledgeHammer01 wrote:

BindingListCollectionView implements everything you need. Like Comparer for example