多WPF列表框只有一个项目在一个时间选择(Multiple WPF ListBoxes with o

我使用MVVM和我一个窗口上显示两个列表框。我从那些既列表框同时结合于不同的领域给他们打电话A和B. A和B是那么这两个修改C.为了使这项工作，我想只有从一次IsSelected两个列表框一个项目，使A不覆盖C使用时乙IsSelected。我怎样才能限制呢？

Answer 1:

我能想到的几个方法可以做到这一点。

一种方法是你可以在绑定ListBox.SelectedIndex您2个列表框来改变，通知视图模型属性。

例如，在您查看：

<ListBox SelectedIndex="{Binding SelectedIndexA}">
     <ListBoxItem Content="Item 1"/>
     <ListBoxItem Content="Item 2"/>
</ListBox>
<ListBox SelectedIndex="{Binding SelectedIndexB}">
     <ListBoxItem Content="Item 1"/>
     <ListBoxItem Content="Item 2"/>
</ListBox>

而在你的视图模型：

public int SelectedIndexA
{
    get { return _selectedIndexA; }
    set
    {
        _selectedIndexA = value;
        _selectedIndexB = -1;
        OnPropertyChanged("SelectedIndexB");
    }
}

public int SelectedIndexB
{
    get { return _selectedIndexB; }
    set
    {
        _selectedIndexB = value;
        _selectedIndexA = -1;
        OnPropertyChanged("SelectedIndexA");
    }
}

另一种方式是用像“组名”附加属性，您可以在组选择（ ListBox继承自Selector ），以确保只有一个Selector组中的具有在任何一个时刻所选择的项目。

例如：

public static class SingleSelectionGroup
{
    public static readonly DependencyProperty GroupNameProperty =
        DependencyProperty.RegisterAttached("GroupName", typeof(string), typeof(SingleSelectionGroup),
                                            new UIPropertyMetadata(OnGroupNameChanged));

    public static string GetGroupname(Selector selector)
    {
        return (string) selector.GetValue(GroupNameProperty);
    }

    public static void SetGroupName(Selector selector, string value)
    {
        selector.SetValue(GroupNameProperty, value);
    }

    private static void OnGroupNameChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
    {
        var selector = (Selector) dependencyObject;

        if (e.OldValue != null)
            selector.SelectionChanged -= SelectorOnSelectionChanged;
        if (e.NewValue != null)
            selector.SelectionChanged += SelectorOnSelectionChanged;
    }

    private static void SelectorOnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.AddedItems.Count == 0)
            return;

        var selector = (Selector) sender;
        var groupName = (string) selector.GetValue(GroupNameProperty);
        var groupSelectors = GetGroupSelectors(selector, groupName);

        foreach (var groupSelector in groupSelectors.Where(gs => !gs.Equals(sender)))
        {
            groupSelector.SelectedIndex = -1;
        }
    }

    private static IEnumerable<Selector> GetGroupSelectors(DependencyObject selector, string groupName)
    {
        var selectors = new Collection<Selector>();
        var parent = GetParent(selector);
        GetGroupSelectors(parent, selectors, groupName);
        return selectors;
    }

    private static DependencyObject GetParent(DependencyObject depObj)
    {
        var parent = VisualTreeHelper.GetParent(depObj);
        return parent == null ? depObj : GetParent(parent);
    }

    private static void GetGroupSelectors(DependencyObject parent, Collection<Selector> selectors, string groupName)
    {
        var childrenCount = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < childrenCount; i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            var selector = child as Selector;
            if (selector != null && (string) selector.GetValue(GroupNameProperty) == groupName)
                selectors.Add(selector);

            GetGroupSelectors(child, selectors, groupName);
        }
    }
}

而在你的视野：

<ListBox my:SingleSelectionGroup.GroupName="Group A">
    <ListBoxItem Content="Item 1 (Group A)"/>
    <ListBoxItem Content="Item 2 (Group A)"/>
</ListBox>
<ListBox my:SingleSelectionGroup.GroupName="Group A">
    <ListBoxItem Content="Item 1 (Group A)"/>
    <ListBoxItem Content="Item 2 (Group A)"/>
</ListBox>

<ListBox my:SingleSelectionGroup.GroupName="Group B">
    <ListBoxItem Content="Item 1 (Group B)"/>
    <ListBoxItem Content="Item 2 (Group B)"/>
</ListBox>
<ListBox my:SingleSelectionGroup.GroupName="Group B">
    <ListBoxItem Content="Item 1 (Group B)"/>
    <ListBoxItem Content="Item 2 (Group B)"/>
</ListBox>

如果你必须点击一个项目将突出显示了两次，你可以使用一个快速的解决方法是这样的：

<Style TargetType="ListBoxItem">
    <Style.Triggers>
        <EventTrigger RoutedEvent="GotKeyboardFocus">
            <BeginStoryboard>
                <Storyboard>
                    <BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="(ListBoxItem.IsSelected)">
                        <DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="True" />
                    </BooleanAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Style.Triggers>
</Style>

Answer 2:

如果有人使用了列表框/的ListView里面的ItemsControl并具有使用上述答案后 ，以下问题：

当您在ListBox1中点击任何一个项目的项目被选中。
当你点击listbox2任何项目ListBox1中的所选项目未被选中，但在listbox2不选。
当您在listbox2任何项目再次单击该项目被选中。

只需在下面XAML添加到您的ListBoxItem的风格：

<Style  TargetType="ListBoxItem">
    <Style.Triggers>
        <Trigger Property="IsKeyboardFocusWithin" Value="True">
             <Setter Property="IsSelected" Value="True"></Setter>
        </Trigger>
    </Style.Triggers>
</Style>

此外，如果任何人使用上述答案代码后，收到以下错误：

GroupName is already registered by Selector

请更改third parameter typeof(......)在依赖属性声明你的类的名称 。