VisualTreeHelper找不到DependencyObject的子代，如何可靠地找到对象? [英] VisualTreeHelper not finding children of DependencyObject, How can I reliably find objects?

问题描述

我有一个名为ZoneContainer的UserControl.它具有一个包含ListBox的属性，该ListBox包含许多ListItem.每个ListItem都包含一个DockPanel.

I have a UserControl called ZoneContainer. This has a property that which contains a ListBox containing a number of ListItems. Each ListItem contains a DockPanel.

我正在尝试使用以下代码查找ZoneContainer内部存在的子代，但childrenCount每次都是0.

I'm trying to use a the following code to find the children that exist inside ZoneContainer but childrenCount is 0 every time.

var parent = this as DependencyObject; // I can see that this is populated.

int childrenCount = VisualTreeHelper.GetChildrenCount(parent);

还有另一种方法可以在对象列表中找到特定的子对象吗?最终，我试图找到DockPanel，但是即使我知道他们在对象中，也没有找到任何孩子.

Is there another way to find a specific child object inside a list of objects? Ultimately I'm trying to find the DockPanel, but it's not finding any children even though I know they're in the object.

推荐答案

我通过查询对象而不是对可视树进行爬网来解决了此问题.

I resolved this issue by querying the objects rather than crawling the visual tree.

var header = container.ListBox.Items.Cast<ListBoxItem>()
    .Select(item => (MyType) item.Content)
    .FirstOrDefault(myType => myType.dpHeader.Name == "whatever").dpHeader;

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