UIElement 已从 canvas.Children 集合中删除，但仍会绘制。这是为什么呢？
我尝试从 Canvas 中删除 UIElement。但尽管它已从 canvas.Children 集合中删除，但仍然保留在画布上绘制。
你知道这个问题有什么解决办法吗？
I try to remove an UIElement from the Canvas. But although it is removed from the canvas.Children collection, is still remains drawn on the canvas.
Do you know any solution to this problem?
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你说的不真实一定是真实的，所以你必须使用工具来解决明显的矛盾。
第一个也是最传统的工具是调试器。您可以从字面上检查
Canvas的Children属性，看看该元素是否存在，即使您认为已删除它。这就是“信任但验证”原则。通常你不需要验证常识性的事情，但当你有矛盾时就该开始验证了。第二个工具 Snoop 非常强大，非常适合您的情况：
您可以使用工具在可视化树中找到流氓对象，查看其父级，查看其属性等。这可能会让您相信它确实仍然是可视化树的一部分，但可能不在您认为的位置。
What you say is not true must be true and so you will have to use tools to resolve the apparent contradiction.
The first and most traditional tool is the debugger. You can literally inspect the
Childrenproperty of theCanvasand see if the element is there even though you think you removed it. This is the "trust but verify" principle. Normally you don't have to verify common sense things but when you have a contradiction it's time to start verifying.The second tool, Snoop, is very powerful and ideally suited for your situation:
With this tool you can find the rogue object in the visual tree, see its parent, see its properties, etc. This might convince you that it is indeed still part of the visual tree, but perhaps not where you thought it was.