C# WPF中的行走树视图问题
我正在使用以下示例代码:C# WPF中的行走树视图问题,c#,wpf,C#,Wpf,我正在使用以下示例代码: private TreeViewItem GetNearestContainer(UIElement element) { // Walk up the element tree to the nearest tree view item. TreeViewItem container = element as TreeViewItem; while ((container == null) && (el
private TreeViewItem GetNearestContainer(UIElement element)
{
// Walk up the element tree to the nearest tree view item.
TreeViewItem container = element as TreeViewItem;
while ((container == null) && (element != null))
{
element = VisualTreeHelper.GetParent(element) as UIElement;
container = element as TreeViewItem;
}
return container;
}
在运行时,ui元素
显示为一个TextBlock
(它实际上是一个正在拖动的treevieItem
),在这一行:
TreeViewItem container = element as TreeViewItem
即使元素是
TextBlock
,容器也总是填充null。这是否意味着它不能正确施放?我正试图用它来实现一个拖放操作。我想你可以在可视化树中找到包含文本块的TreeViewItem,类似这样的东西
public static class Exensions
{
/// <summary>
/// Traverses the visual tree for a <see cref="DependencyObject"/> looking for a parent of a given type.
/// </summary>
/// <param name="targetObject">The object who's tree you want to search.</param>
/// <param name="targetType">The type of parent control you're after</param>
/// <returns>
/// A reference to the parent object or null if none could be found with a matching type.
/// </returns>
public static DependencyObject FindParent(this DependencyObject targetObject, Type targetType)
{
DependencyObject results = null;
if (targetObject != null && targetType != null)
{
// Start looking form the target objects parent and keep looking until we either hit null
// which would be the top of the tree or we find an object with the given target type.
results = VisualTreeHelper.GetParent(targetObject);
while (results != null && results.GetType() != targetType) results = VisualTreeHelper.GetParent(results);
}
return results;
}
}
TreeViewItem treeViewItem = textBlock.FindParent(typeof(TreeView));