Select/DeSelect All with Checkbox on ListView (Windows 10)

Question

Hi i want do Select/DeSelect items with checkbox , my source codes :

XAML :

<ListView
        x:Name="downListView"
        Grid.RowSpan="2"
        Margin="-1,29,1,3"
        ScrollViewer.HorizontalScrollBarVisibility="Hidden"
        ScrollViewer.HorizontalScrollMode="Disabled"
        ScrollViewer.VerticalScrollBarVisibility="Visible"
        ScrollViewer.VerticalScrollMode="Enabled"
        SelectionMode="Multiple">
    <ListView.ItemTemplate>
        <DataTemplate>
            <Grid Margin="0,2,0,2" Loaded="downListView_Loaded">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <StackPanel Grid.Row="0" Orientation="Horizontal">
                    <TextBlock
                            x:Name="downPosition"
                            Foreground="#C2C2CA"
                            Text="{Binding position}" />
                    <TextBlock Text=":" />
                    <TextBlock
                            x:Name="downTitle"
                            Foreground="#C2C2CA"
                            Text="{Binding title}" />
                </StackPanel>
                <ProgressBar
                            x:Name="downBar"
                            Grid.Row="1"
                            Background="White"
                            Foreground="#DC143C"
                            Value="{Binding Percent}" />
                <TextBlock
                            x:Name="downStat"
                            Grid.Row="2"
                            Foreground="#C2C2CA"
                            Text="{Binding Status}" />
            </Grid>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

C# :

private ObservableCollection<VideoDatas> listItems = ...;
downListView.ItemsSource = listItems;

I tried this :

private void downListView_Loaded(object sender, RoutedEventArgs e)
{
    Panel panel = sender as Panel;
    if (panel != null)
    {
        ListViewItem lvi = FindParent<ListViewItem>(panel);
        if (lvi != null)
        {
            lvi.SetBinding(ListViewItem.IsSelectedProperty, new Binding()
            {
                Path = new PropertyPath(nameof(VideoDatas.IsSelected)),
                Source = panel.DataContext,
                Mode = BindingMode.TwoWay
            });
        }
    }
}
public static T FindParent<T>(DependencyObject dependencyObject) where T : DependencyObject
{
    var parent = VisualTreeHelper.GetParent(dependencyObject);

    if (parent == null)
        return null;

    var parentT = parent as T;
    return parentT ?? FindParent<T>(parent);
}

private void CheckedChanged()
{
    if (listItems != null)
    {
        foreach (VideoDatas item in listItems)
        {
            if (dSelectAll.IsChecked == true)
            {
                item.IsSelected = true;
                dSelectAllText.Text = "DeSelect All | Choose for download";
            }
            else
            {
                item.IsSelected = false;
                dSelectAllText.Text = "Select All | Choose for download";
            }
        }
    }
}

private void dSelectAll_Click(object sender, RoutedEventArgs e)
{
    CheckedChanged();
}

VideoDatas.cs

private bool isSelected;
public bool IsSelected
{
    get
    {
        return isSelected;
    }
    set
    {
        if (value != isSelected)
        {
            isSelected = value;
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs("IsSelected"));
            }
        }
    }
}

But this code just select ex:10 items/170 items.Just select showin items on listview, dont select other items

Justin XL · Accepted Answer · 2017-07-05 20:34:25Z

1

You are manually ticking the built-in CheckBox inside each ListViewItem on load. This solution looks OK but the issue is that the ListView is virtualizing its items so it only realizes a few of them to save memory, and you end up only ticking them.

The right way is to use the built-in methods downListView.SelectAll() to select all of them, and downListView.SelectedItems.Clear(); to deselect all of them.

edited Jul 5, 2017 at 20:34

answered Jul 5, 2017 at 12:49

Justin XL

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3 Comments

Marian Dolinský Over a year ago

What about downListView.SelectedItems.Clear();? It works the same but is more readable. Is there any reason why not to use it?

Justin XL Over a year ago

@MarianDolinský haha you got me there. I think I just wasn't thinking properly lol.

OMANSAK Over a year ago

so more ways to do :) i first tried this code ,after tried SelectRange and DeselectRange :) .

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