Question

好的，我得到了一个包含ListBox的Tabcontrol。现在我的问题是我想将<TextBox x:Name="DetailTextBox" Text="{Binding Detail}"/>绑定到列表框中的selectedItem并显示Detail属性值。请注意，TextBox不是TabControl的一部分，而是在另一列中。

我无法弄清楚，当有多个ListBox时，如何处理绑定，每个TabControl项中都有一个。

我的班级

public class TabViewModel
{
    public string Name { get; set; }
    public ObservableCollection<TabItemViewModel> Collection { get; set; }
}

public class TabItemViewModel
{
    public string Title { get; set; }
    public string Detail { get; set; }
}

public MainWindow（）

 var tabViewModels = new ObservableCollection<TabViewModel>();
            tabViewModels.Add(new TabViewModel{Name = "Tab 1", Collection = new ObservableCollection<TabItemViewModel>{new TabItemViewModel{Detail = "Detail 1.1", Title = "Title 1.1"}, new TabItemViewModel{Detail = "Detail 2.2", Title = "Title 2.2"}}});
            tabViewModels.Add(new TabViewModel { Name = "Tab 2", Collection = new ObservableCollection<TabItemViewModel> { new TabItemViewModel { Detail = "Detail 2.1", Title = "Title 2.1" }, new TabItemViewModel { Detail = "Detail 2.2", Title = "Title 2.2" } } });
            tabViewModels.Add(new TabViewModel { Name = "Tab 3", Collection = new ObservableCollection<TabItemViewModel> { new TabItemViewModel { Detail = "Detail 3.1", Title = "Title 3.1" }, new TabItemViewModel { Detail = "Detail 3.2", Title = "Title 3.2" } } });
            DataContext = tabViewModels;

MainWindow.xaml。

<Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="50*"/>
            <ColumnDefinition Width="50*"/>
        </Grid.ColumnDefinitions>
        <TabControl ItemsSource="{Binding}" Grid.Column="0" SelectedIndex="0">
            <TabControl.ItemContainerStyle>
                <Style TargetType="{x:Type TabItem}">
                    <Setter Property="Header">
                        <Setter.Value>
                            <Binding Path="Name"/>
                        </Setter.Value>
                    </Setter>
                </Style>
            </TabControl.ItemContainerStyle>
            <TabControl.ContentTemplate>
                <DataTemplate>
                    <ListBox ItemsSource="{Binding Collection}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <Label Content="{Binding Title}" />
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>
                </DataTemplate>
            </TabControl.ContentTemplate>
        </TabControl>
        <StackPanel Grid.Column="1">
            <TextBox x:Name="DetailTextBox" Text="{Binding Detail}"/>
        </StackPanel>
    </Grid>

enter image description here

修改

临时解决方案 找到了让它工作的方法，但我仍在寻找纯Xaml解决方案。添加了SelectionChange事件

 <ListBox ItemsSource="{Binding Collection}" SelectionChanged="ListBox_SelectionChanged">

     private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
            {
                if (e.AddedItems.Count > 0)
                    DetailTextBox.DataContext = (TabItemViewModel) e.AddedItems[0];
            }

Answer 1

怎么样，我很惊讶自己:-)
对您的Xaml进行这些更改。

<TabControl ItemsSource="{Binding}" 
    Grid.Column="0" SelectedIndex="0" 
    IsSynchronizedWithCurrentItem="True">

<ListBox ItemsSource="{Binding Collection}" 
    IsSynchronizedWithCurrentItem="True">

<TextBox x:Name="DetailTextBox" 
    Text="{Binding /Collection/Detail}"/>

'/'绑定到控件的CollectionView的当前所选项目。

所以上面的绑定正在向下钻取

在数据上下文中设置的ObservableCollection的当前SelectedItem
该项目的Collection属性
Collection属性的当前SelectedItem（ObservableCollection）
该项目的详情属性。

为了实现这一点，我们需要指定IsSynchronizedWithCurrentItem="True"以确保SelectedItem保持与每个集合的当前项保持同步。

在TabControl中绑定到ListBox selectedItem

1 个答案: