如何在WPF TreeView中清除TreeView选中项?我尝试循环遍历TreeNodes
并清除IsSelected
属性,但该属性是只读的。有什么想法吗?
TreeView
使用通过XMLDataProvider
对象的XML绑定。
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,并且只需调用第一个函数即可解决。
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;
}
}
}
}
我不确定你所说的TreeNodes是什么。
通常,你会在你的视图模型上有一个对应的IsSelected
属性,供你的视图进行绑定:
<TreeView>
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="IsSelected" Value="{Binding IsSelected}"/>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
IsSelected = false
。TreeViewItem
。有关如何执行此操作,请参见 TreeView.ItemContainerGenerator
属性。类似以下内容:var 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; }
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;
}
}
查找所选项目并设置其值:
private void Button_Click(object sender, RoutedEventArgs e)
{
TreeViewItem tvi = treeviewExample.SelectedItem as TreeViewItem;
if (tvi != null)
{
tvi.IsSelected = false;
}
}
根据我的经验,我建议避免使用标准的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,当处理TreeView时,它对我非常有帮助。
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;
}
我刚遇到了同样的问题。
一个快速而简单的解决方案
tree.ItemsSource = null;
tree.ItemsSource = yourSource;
目前看来这个方法似乎是可行的,但我只是五分钟之前刚加入,所以使用时请自行承担风险。我基本上想在用户在树形控件内单击时清除选择内容,但不希望在单击树项时清除。
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;
}
}
}
我在使用自定义的树形列表视图实现时遇到了这种情况,经过长时间的寻找,我终于找到了适合我的解决方案。
基本思路是捕获TreeViewItem.Selected
事件,并将事件源保存到您的TreeView的Tag
属性中。然后当您需要清除它时,您可以访问您控件上的Tag
属性,并将IsSelected
值设置为False。对于我来说,这适用于两个级别的嵌套子项。希望它也适用于您。
为了持久性:
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;
}
if (myTreeView.SelectedItem != null)
{
TreeViewItem selectedTVI = myTreeView.Tag as TreeViewItem;
// add your code here mine was selectedTVI.IsSelected = false;
}