从ListView中打开所选项目的扩展器 [英] Open an Expander of a selected item from a ListView

问题描述

我需要通过代码选择ListView的项.这些项目被分组并包装在扩展器中.因此，如果选择了一个包含的项目，也应该打开一个扩展器.
现在，我很难通过代码或触发器来做到这一点.如何做到这一点?

这是ListView的代码:

I need to select an item of a ListView by code. The items are grouped and wrapped in Expanders. Therefore an Expander should be opened as well if a contained item is selected.
Now, I have difficulties to do that either by code or by triggers. How can be done that?

This is the code of the ListView:

<身体>

< UserControl.Resources >

< local:NAV x: =

< CollectionViewSource x: = = <UserControl.Resources>        <local:NAV x:Key="myNavList" />        <CollectionViewSource x:Key='src2' Source="{Binding Source={StaticResource myNavList}, Path=NavGetList}">           <CollectionViewSource.GroupDescriptions>              <PropertyGroupDescription PropertyName="ACategory" />          </CollectionViewSource.GroupDescriptions>      </CollectionViewSource>            <Style x:Key="myHeaderStyle" TargetType="{x:Type GridViewColumnHeader}">           <Setter Property="Height" Value="0"/>       </Style>    </UserControl.Resources>          <Grid Name="GridN">         <Grid.RowDefinitions>          <RowDefinition Height="Auto" />          <RowDefinition Height="Auto" MinHeight="50" />          <RowDefinition Height="*" />      </Grid.RowDefinitions>        <ListView Name="ListProfile"                        Grid.Row="2"                      ItemsSource="{Binding Source={StaticResource src2}}"                      SelectedValuePath="{Binding Path=Men_id}"                    BorderThickness="0"                      ScrollViewer.VerticalScrollBarVisibility="Visible"                      ScrollViewer.HorizontalScrollBarVisibility="Disabled"                    SelectionMode="Single" >          <ListView.GroupStyle>              <GroupStyle>                  <GroupStyle.ContainerStyle>                      <Style TargetType="{x:Type GroupItem}">                           <Setter Property="Margin" Value="0,0,0,5"/>                           <Setter Property="Template">                               <Setter.Value>                                  <ControlTemplate TargetType="{x:Type GroupItem}">                                         <Expander x:Name="Expo" IsExpanded="False" >                                          <Expander.Header>                                              <DockPanel Style="{StaticResource ExHead}" >                                                  <TextBlock Text="{Binding Path=Name}"                                                                   Margin="5,0,0,0" Width="50" DockPanel.Dock="Left"/>                                                   <TextBlock Text="{Binding Path=ItemCount}" />                                              </DockPanel>                                          </Expander.Header>                                          <Expander.Content>                                              <ItemsPresenter />                                          </Expander.Content>                                      </Expander>                                    </ControlTemplate>                              </Setter.Value>                          </Setter>                      </Style>                  </GroupStyle.ContainerStyle>              </GroupStyle>          </ListView.GroupStyle>            <ListView.View>              <GridView ColumnHeaderContainerStyle="{StaticResource myHeaderStyle}" >                  <GridViewColumn DisplayMemberBinding="{Binding Path=AStatus}" Width="20" />                  <GridViewColumn DisplayMemberBinding="{Binding Path=AValue}" />              </GridView>          </ListView.View>        </ListView>    </Grid>    </UserControl>    推荐答案 解决方案.这很丑陋，有点慢.无法访问选定项目中的组吗? I have found a solution. It is quite ugly and a bit slow. Is there no other possibilities to access groups from a selected item? <身体> SubFindPerson(ByVal ID作为向导) 尝试 ListProfile.UnselectAll() 对于每个i作为TNav在ListProfile.Items中 如果CType(i.AId，Guid)= ID，则 ListProfile.SelectedItem = i 字体> 扩展组(i.ACategory) 退出 结束如果 下一个 异常捕获 MessageBox.Show(ex.Message) 结束尝试 结束Sub 私人SubExpandGroup(ByVal Gruppe As String) 昏暗的As Integer 对于ListProfile.Items.Groups中的每个h h.Name = 然后 退出 结束如果 n = + 1 下一步 昏暗的人作为DependencyObject pa == ListProfile .ItemContainerGenerator.ContainerFromItem(ListProfile.Items.Groups(n)) Dim aaa作为 扩展器 = VisualTreeHelper .GetChild(pa，́0) aaa.IsExpanded = 真实 ListProfile.Items.Dispatcher.BeginInvoke(Windows.Threading.DispatcherPriority.Background，_ 新建SetSelectedItemDelegate(AddressOfSetSelectedItem)) 结束Sub PublicDelegate Sub SetSelectedItemDelegate() Public Sub SubSetSelectedItem() ListProfile.ScrollIntoView(ListProfile.SelectedItem) 结束Sub     Sub FindPerson(ByVal ID As Guid)           Try               ListProfile.UnselectAll()               For Each i As TNav In ListProfile.Items                   If CType(i.AId, Guid) = ID Then                       ListProfile.SelectedItem = i                       ExpandGroup(i.ACategory)                       Exit For                   End If               Next           Catch ex As Exception               MessageBox.Show(ex.Message)           End Try       End Sub         Private Sub ExpandGroup(ByVal Gruppe As String)           Dim n As Integer           For Each h In ListProfile.Items.Groups               If h.Name = Gruppe Then                   Exit For               End If               n += 1           Next           Dim pa As DependencyObject           pa = ListProfile.ItemContainerGenerator.ContainerFromItem(ListProfile.Items.Groups(n))           Dim aaa As Expander = VisualTreeHelper.GetChild(pa, 0)           aaa.IsExpanded = True          ListProfile.Items.Dispatcher.BeginInvoke(Windows.Threading.DispatcherPriority.Background, _                                    New SetSelectedItemDelegate(AddressOf SetSelectedItem))       End Sub         Public Delegate Sub SetSelectedItemDelegate()         Public Sub SetSelectedItem()           ListProfile.ScrollIntoView(ListProfile.SelectedItem)       End Sub         这篇关于从ListView中打开所选项目的扩展器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！ 登录 关闭 扫码关注1秒登录 发送“验证码”获取 | 15天全站免登陆 友情链接： IT屋 Chrome插件 谷歌浏览器插件 IT屋 ©2016-2022 琼ICP备2021000895号-1 站点地图 站点标签 SiteMap <免责申明> 本站内容来源互联网,如果侵犯您的权益请联系我们删除.