ItemContainerGenerator.ContainerFromItem()返回null吗? [英] ItemContainerGenerator.ContainerFromItem() returns null?
问题描述
我有一些奇怪的行为,我似乎无法解决.当我遍历ListBox.ItemsSource属性中的项目时,我似乎无法获得容器?我期望看到返回的ListBoxItem,但我只会得到null.
I'm having a bit of weird behavior that I can't seem to work out. When I iterate through the items in my ListBox.ItemsSource property, I can't seem to get the container? I'm expecting to see a ListBoxItem returned, but I only get null.
有什么想法吗?
以下是我正在使用的一些代码:
Here's the bit of code I'm using:
this.lstResults.ItemsSource.ForEach(t =>
{
ListBoxItem lbi = this.lstResults.ItemContainerGenerator.ContainerFromItem(t) as ListBoxItem;
if (lbi != null)
{
this.AddToolTip(lbi);
}
});
ItemsSource当前设置为字典,并且确实包含许多KVP.
The ItemsSource is currently set to a Dictionary and does contain a number of KVPs.
推荐答案
最后解决了问题...通过将VirtualizingStackPanel.IsVirtualizing="False"
添加到我的XAML中,现在一切都按预期工作.
Finally sorted out the problem... By adding VirtualizingStackPanel.IsVirtualizing="False"
into my XAML, everything now works as expected.
不利的一面是,我错过了虚拟化带来的所有性能优势,因此我将负载路由更改为异步,并在加载时在列表框中添加了旋转器" ...
On the downside, I miss out on all the performance benefitst of the virtualization, so I changed my load routing to async and added a "spinner" into my listbox while it loads...
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