Question

使用以下XAML遇到了一些困难：

<ListBox x:Name="lstRegion" ItemsSource="{Binding}" SelectionMode="Multiple">
    <ListBox.ItemTemplate>
        <DataTemplate DataType="ListBoxItem">
            <CheckBox  Content="{Binding Element.Region_Code}" IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}, Path=IsSelected, Mode=TwoWay}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

此代码将更新包含的ListBoxItem的IsSelected属性，使我可以从lstRegion.SelectedItems返回此内容。

但是，当复选框IsChecked值更改时，我还需要更新ItemsSource中的值。有没有一种方法可以更新ItemsSource和ListBoxItem中的值？看来我可以改变一个或另一个，但不能两者都改变。我确定我可以捕获PropertyChanged事件并手动更新该值，但这似乎又要执行额外的步骤，因为我无法正确理解某些内容。任何帮助表示赞赏。

以下是用于填充ListBox上ItemsItem的类：

 public class SelectionItem<T> : INotifyPropertyChanged
    {
        #region private fields
        /// <summary>
        /// indicates if the item is selected
        /// </summary>
        private bool _isSelected;
        #endregion

        public SelectionItem(T element, bool isSelected)
        {
            Element = element;
            IsSelected = isSelected;
        }

        public SelectionItem(T element):this(element,false)
        {

        }

        #region public properties
        /// <summary>
        /// this UI-aware indicates if the element is selected or not
        /// </summary>
        public bool IsSelected
        {
            get
            {
                return _isSelected;
            }
            set
            {
                if (_isSelected != value)
                {
                    _isSelected = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("IsSelected"));
                }
            }
        }

        /// <summary>
        /// the element itself
        /// </summary>
        public T Element { get; set; }
        #endregion

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;
   }

Answer 1

类似的东西应该可以为您提供所需的东西：

<ListBox x:Name="lstRegion" ItemsSource="{Binding}" SelectionMode="Multiple">
    <ListBox.ItemTemplate>
        <DataTemplate DataType="ListBoxItem">
            <CheckBox Content="{Binding Element.Region_Code}" IsChecked="{Binding IsSelected, Mode=TwoWay}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
    <ListBox.ItemContainerStyle>
        <Style TargetType="x:Type ListBoxItem}">
            <Setter Property="IsSelected" Value="{Binding IsSelected}" />
        </Style>
    </ListBox.ItemContainerStyle>
</ListBox>

属性更改时，WPF更新两个值

1 个答案: