ItemContainerGenerator.ContainerFromItem() 返回 null? [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，我似乎无法获取容器?我期待看到 ListBoxItem 返回，但我只得到 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?

这是我正在使用的代码:

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 Dictionary 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

终于解决了问题...通过将 VirtualizingStackPanel.IsVirtualizing="False" 添加到我的 XAML 中，现在一切都按预期进行.

Finally sorted out the problem... By adding VirtualizingStackPanel.IsVirtualizing="False" into my XAML, everything now works as expected.

不利的一面是，我错过了虚拟化的所有性能优势，因此我将加载路由更改为异步，并在加载时将微调器"添加到我的列表框中...

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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