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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