如何清除 WPF TreeView 中的 TreeView 选择？我尝试循环遍历
TreeNodesIsSelectedReadOnlyTreeViewXMLDataProvider我遇到了完全相同的问题，并编写了以下代码，该代码适用于任何树视图，只需对第一个函数进行单行调用。
class TomWrightsUtils
{
public static void ClearTreeViewSelection(TreeView tv)
{
if (tv != null)
ClearTreeViewItemsControlSelection(tv.Items, tv.ItemContainerGenerator);
}
private static void ClearTreeViewItemsControlSelection(ItemCollection ic, ItemContainerGenerator icg)
{
if ((ic != null) && (icg != null))
for (int i = 0; i < ic.Count; i++)
{
TreeViewItem tvi = icg.ContainerFromIndex(i) as TreeViewItem;
if (tvi != null)
{
ClearTreeViewItemsControlSelection(tvi.Items, tvi.ItemContainerGenerator);
tvi.IsSelected = false;
}
}
}
}
不确定您所说的 TreeNode 是什么意思。
通常，您的视图绑定到的视图模型上会有相应的
IsSelected<TreeView>
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="IsSelected" Value="{Binding IsSelected}"/>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
因此，您只需循环访问视图模型中的数据项并在那里设置
IsSelected = false但是，听起来你没有这样的财产。既然如此，就需要为每个数据项获取对应的
TreeViewItemTreeView.ItemContainerGeneratorvar treeViewItem = _treeView.ItemContainerGenerator.ContainerFromIndex(0) as TreeViewItem;
treeViewItem.IsSelected = false;
TreeViewItem tvi = tvMain.ItemContainerGenerator.ContainerFromIndex(0) as TreeViewItem;
if (tvi != null) { tvi.IsSelected = true; tvi.IsSelected = false; }
找到选中的项目并设置值：
private void Button_Click(object sender, RoutedEventArgs e)
{
TreeViewItem tvi = treeviewExample.SelectedItem as TreeViewItem;
if (tvi != null)
{
tvi.IsSelected = false;
}
}
这作为扩展方法非常有效，因此您可以调用
youTreeview.ClearSelection();
using System.Windows.Forms;
using System.Windows.Controls;
namespace YourAppNamespace
{
public static void ClearSelection(this TreeView input)
{
// this should be some container that you put in
// possibly the actual treeviewitem, not sure on that though
var selected = input.SelectedItem;
if (selected == null)
return;
// in my case this works perfectly
var tvi = input.ItemContainerGenerator.ContainerFromItem(selected) as TreeViewItem;
var tvi = input.ItemContainerGenerator.ContainerFromItem(selected) as TreeViewItem;
if (tvi == null)
{
// it must be a child, heres a hack fix
// my nodes are inherited from TreeViewItemViewModel by Josh Smith
var child = selected as WPF.Controls.TreeViewItemViewModel;
if (child == null)
return;
child.IsSelected = false;
}
else
tvi.IsSelected = false;
}
}
我的经验是远离标准 ItemContainerGenerator 调用，因为它们会在深度大于 n+1 的节点上失败。我使用以下扩展方法的组合。 ContainerFromItem 扩展方法来自 MSDN 博客，它在处理 TreeView 时为我创造了奇迹。
public static void ClearSelection(this TreeView input)
{
var selected = input.SelectedItem;
if (selected == null) return;
var tvi = input.ContainerFromItem(selected) as TreeViewItem;
if (tvi == null) return;
tvi.IsSelected = false;
}
public static TreeViewItem ContainerFromItem(this TreeView treeView, object item)
{
TreeViewItem containerThatMightContainItem = (TreeViewItem)treeView.ItemContainerGenerator.ContainerFromItem(item);
if (containerThatMightContainItem != null)
return containerThatMightContainItem;
else
return ContainerFromItem(treeView.ItemContainerGenerator, treeView.Items, item);
}
private static TreeViewItem ContainerFromItem(ItemContainerGenerator parentItemContainerGenerator, ItemCollection itemCollection, object item)
{
foreach (object curChildItem in itemCollection)
{
TreeViewItem parentContainer = (TreeViewItem)parentItemContainerGenerator.ContainerFromItem(curChildItem);
if (parentContainer == null)
return null;
TreeViewItem containerThatMightContainItem = (TreeViewItem)parentContainer.ItemContainerGenerator.ContainerFromItem(item);
if (containerThatMightContainItem != null)
return containerThatMightContainItem;
TreeViewItem recursionResult = ContainerFromItem(parentContainer.ItemContainerGenerator, parentContainer.Items, item);
if (recursionResult != null)
return recursionResult;
}
return null;
}
到目前为止，这似乎有效，但我只是在 5 分钟前将其放入，因此使用风险自负。我基本上想在用户单击树控件内而不是树项目时清除选择。
void DestinationTree_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
TreeView tree = sender as TreeView;
DestinationClientViewModel selectedItem = tree.SelectedItem as DestinationClientViewModel;
if (selectedItem != null)
{
int selectedItemIndex = this.DestinationTree.Items.IndexOf(selectedItem);
if (selectedItemIndex > -1)
{
TreeViewItem tvi = this.DestinationTree.ItemContainerGenerator.ContainerFromIndex(selectedItemIndex) as TreeViewItem;
if (tvi != null)
tvi.IsSelected = false;
}
}
}
我自己在使用自定义树列表视图实现时遇到了这种情况，经过很长时间的寻找，我终于找到了一个适合我的解决方案。
基本思想是捕获
TreeViewItem.SelectedTagTagIsSelected为了坚持：
TreeView声明
<TreeView Name="myTreeView" TreeViewItem.Selected="OnItemSelected"
ItemsSource="{Binding Source={StaticResource myHierarchicalData}}"/>
事件处理程序
private void OnItemSelected(object sender, RoutedEventArgs e)
{
myTreeView.Tag = e.OriginalSource;
}
清晰的选择逻辑
if (myTreeView.SelectedItem != null)
{
TreeViewItem selectedTVI = myTreeView.Tag as TreeViewItem;
// add your code here mine was selectedTVI.IsSelected = false;
}
我刚刚遇到了同样的问题。
快速但肮脏的解决方案
tree.ItemsSource = null;
tree.ItemsSource = yourSource;
这对我来说非常完美
var tvi = CurvesTree.ItemContainerGenerator.ContainerFromItem(CurvesTree.SelectedItem) as TreeViewItem;
if (tvi is null)
return;
tvi.IsSelected = false;