内容目录与Trigger
原文：Change Template of ContentControl with Trigger

I have a Listbox containing many items. When I hover over an item I need to display a rather heavy popup. I m pretty sure that loading the popup for each item is a waste of resources so what I d ...

视觉内容
原文：Get Window s visual content

I currently have this line of code which I want to work in all cases: var visualWindowContent = (UIElement)window.Content; This approach will work when Window.Content is a UIElement. But what about ...