Question

我无法清除ListBox.SelectedItems集合。请说明我做错了什么。我以不同的方式清除收藏，但它留下了以前的收藏。

我清楚收集所以：

chListBox.SelectedItems.Clear();

或

chListBox.UnselectAll();

或

chListBox.SetSelectedItems(new ArrayList());

我的代码：

public class CheckListBox : ListBox
    {
        public CheckListBox()
        {
            this.SelectionChanged += CheckListBox_SelectionChanged;
            this.Resources = Application.LoadComponent(new Uri("/TASWpfControls;component/Resources/CheckListBoxResources.xaml", UriKind.RelativeOrAbsolute)) as ResourceDictionary;
            this.ItemContainerStyle = this.Resources["CheckListBoxItem"] as Style;
            this.AddHandler(ButtonBase.ClickEvent, new RoutedEventHandler(ClickEventHandler));
        }

        private void ClickEventHandler(object sender, RoutedEventArgs routedEventArgs)
        {
            RoutedEventArgs eventArgs = new RoutedEventArgs(ItemSelectedEvent);
            this.RaiseEvent(eventArgs);
        }

        public string PropertyName { get; set; }

        public string PropertyCompare { get; set; }

        public static readonly DependencyProperty SelectedSourceProperty =
            DependencyProperty.Register("SelectedSource", typeof(IList), typeof(CheckListBox), new PropertyMetadata(SelectedSourceChanged));

        public IList SelectedSource
        {
            get { return (IList)GetValue(SelectedSourceProperty); }
            set { SetValue(SelectedSourceProperty, value); }
        }

        public static RoutedEvent ItemSelectedEvent =
            EventManager.RegisterRoutedEvent("ItemSelected", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(CheckListBox));

        public event RoutedEventHandler ItemSelected
        {
            add { AddHandler(ItemSelectedEvent, value); }
            remove { RemoveHandler(ItemSelectedEvent, value); }
        }

        protected static void SelectedSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            CheckListBox chListBox = d as CheckListBox;
            if (chListBox != null)
                chListBox.SortListBox(chListBox, e.NewValue);
        }

        protected virtual void SortListBox(CheckListBox chListBox, object newValue)
        {
            chListBox.SelectedSource = newValue as IList;
            IList selectedItems = chListBox.SelectedSource;
            chListBox.SelectedItems.Clear();
            if (selectedItems != null && selectedItems.Count > 0)
            {
                foreach (object selectedItem in selectedItems)
                {
                    foreach (object item in chListBox.Items)
                    {
                        if (eIReflector.GetValue(item, chListBox.PropertyName).Equals(eIReflector.GetValue(selectedItem, chListBox.PropertyName)))
                            chListBox.SelectedItems.Add(item);
                    }
                }
            }
        }

        protected virtual void CheckListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            foreach (object addedItem in e.AddedItems)
            {
                if (!SelectedItems.Contains(addedItem))
                    SelectedItems.Add(addedItem);

                if (!SelectedSource.Contains(addedItem))
                    SelectedSource.Add(addedItem);
            }

            foreach (object removedItem in e.RemovedItems)
            {
                this.SelectedItems.Add(removedItem);
                this.SelectedSource.Remove(removedItem);
            }
        }
    }

Answer 1

尝试使用

chListBox.ClearSelection(); // For C#

和

chListBox.UnselectAll(); // For WPF

这对我来说很完美......

Answer 2

我能够在WPF中执行以下操作：

while(chListBox.SelectedItems.Count > 0)
{
     chListBox.Items.Remove(chListBox.SelectedItem);
}

Answer 3

我能够使用以下内容：

    var listboxItem = m_listBoxAutocomplete.FindChildElements<ListBoxItem>().FirstOrDefault(t => t.IsSelected);
    Keyboard.Focus(listboxItem);

但是你需要谷歌FindChildElements扩展，这是一个随时可用的

无法清除ListBox.SelectedItems集合wpf

3 个答案: