WPF ListView 选中问题
在项目中遇到了这样的问题，ListView通过数据绑定，有模板的情况下ListViewItem 里面的子控件点击之后默认是子控件获得焦点而不是Item获的焦点。
往往需要获取一个ListViewItem 而不是他的子控件，这时候应该怎么办呢？
先看前台XAML：
View Code
1 <ListView x:Name="lv_VMlist" 2 PreviewMouseDown="lv_VMlist_PreviewMouseDown" 3 SelectionChanged="lv_VMlist_SelectionChanged"> 4 <ListView.View> 5 <GridView> 6 <GridView.Columns> 7 <GridViewColumn Width="100" 8 DisplayMemberBinding="{Binding CallerID}" 9 Header="主叫方号码" /> 10 <GridViewColumn Width="110" 11 DisplayMemberBinding="{Binding Duration}" 12 Header="语音邮件长度" /> 13 <GridViewColumn Width="70" 14 DisplayMemberBinding="{Binding External}" 15 Header="是否是外线" /> 16 <GridViewColumn Width="80" 17 DisplayMemberBinding="{Binding Type, 18 Converter={StaticResource etsc}}" 19 Header="类型" /> 20 <GridViewColumn Width="70" 21 DisplayMemberBinding="{Binding AttachCount}" 22 Header="附件个数" /> 23 <GridViewColumn Width="120" 24 DisplayMemberBinding="{Binding Time}" 25 Header="时间" /> 26 <GridViewColumn Width="180" Header="操作"> 27 <GridViewColumn.CellTemplate> 28 <HierarchicalDataTemplate> 29 <StackPanel Name="stackPanel" Orientation="Horizontal"> 30 <Button Name="btnPlay" 31 Margin="0,0,5,0" 32 Command="{Binding RelativeSource={RelativeSource FindAncestor, 33 AncestorLevel=1, 34 AncestorType={x:Type ListView}}, 35 Path=DataContext.OnPlay}" 36 Content="播放" 37 Focusable="False" /> 38 <Button Name="btnStop" 39 Margin="0,0,5,0" 40 Command="{Binding RelativeSource={RelativeSource FindAncestor, 41 AncestorLevel=1, 42 AncestorType={x:Type ListView}}, 43 Path=DataContext.OnStop}" 44 Content="停止" /> 45 <Button Name="btnSaveAs" 46 Margin="0,0,5,0" 47 Click="btnSaveClick" 48 Content="另存为" 49 ToolTip="将语音邮件保存到本地" /> 50 <Button Name="btnDel" 51 Margin="0,0,5,0" 52 Command="{Binding RelativeSource={RelativeSource FindAncestor, 53 AncestorLevel=1, 54 AncestorType={x:Type ListView}}, 55 Path=DataContext.OnDelete}" 56 Content="删除" 57 ToolTip="删除本条语音邮件" /> 58 <Button Name="btnSendTo" 59 Margin="0,0,5,0" 60 Content="转发" 61 ToolTip="将本条语音邮件转发给他人" /> 62 </StackPanel> 63 </HierarchicalDataTemplate> 64 </GridViewColumn.CellTemplate> 65 </GridViewColumn> 66 </GridView.Columns> 67 </GridView> 68 </ListView.View> 69 </ListView>
要下手去寻找这时候得借助WPF里面的一个神奇的类：VisualTreeHelper 有了这个类几乎能得到界面的任何东西。当然了，先行条件是在子控件的事件触发之前就要出发一个事件去获取ListViewItem，此时我们想到一个事件就是PreviewMouseDown，因为他是鼠标事件，所以优先级比较高，当他触发了之后才会触发子控件的一些Click事件等
后台代码
1 private void lv_VMlist_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e) 2 { 3 int index = -1; 4 DependencyObject depObj = e.OriginalSource as DependencyObject; 5 6 if (depObj == null) return; 7 8 do 9 { 10 depObj = VisualTreeHelper.GetParent(depObj); 11 12 //有可能是点击到listviewitem之外的东西，例如滚动条，这时候会为null 13 if (depObj == null) break; 14 15 //得到listviewitem 16 if (depObj.GetType() == typeof(ListViewItem)) 17 { 18 //再去获取父级，用来得到索引 19 DependencyObject parent = VisualTreeHelper.GetParent(depObj); 20 21 for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++) 22 { 23 if (depObj == VisualTreeHelper.GetChild(parent, i)) 24 { 25 //得到索引后马上跳出 26 index = i; 27 break; 28 } 29 } 30 break; 31 } 32 } 33 while (depObj != null); 34 35 //证明已经找到 36 if (index > -1) 37 { 38 lv_VMlist.SelectedIndex = index; 39 } 40 }
但是需要注意的是，这样写思路倒是简单，就是数据量大的清空可能会影响效率，慎用！
