WPF - Prism - 激活和停用 ContentControl 区域中的视图
在我的应用程序中，我一次只需要一个可见的视图，这就是我在 shell 中使用 ContentControl 的原因。问题是，如果我有一个可见视图（比如说 View1）并且我激活了 View2，那么到目前为止一切都很好。现在，用户按下 View2 上的“关闭”按钮，之后用户最终会看到一个空白屏幕，因为现在没有活动的视图。我认为区域适配器在激活下一个视图之前停用当前活动的视图。
如何确保之前的活动视图再次激活（我的示例中的 View1）？我是否需要不同类型的区域来实现此功能？
预先感谢，
阿里
In my application I only need one view visible at a time which is why I am using a ContentControl in my shell. The issue is that if I have one view visible (lets say View1) and I activate View2, everything is fine up to this point. Now the user presses the Close button on View2 after which the users end up looking at a blank screen now since no views are active now. I suppose that the region adapter Deactivates the currently active view before activating the next view.
How can I ensure that the previously active view becomes Activated again (View1 from my example)? Do I need a different type of region to achieve this functionality?
Thanks in advance,
Ali
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不幸的是（正如您所发现的）这不是行为。您必须跟踪您的视图并亲自激活前一个视图。
耶利米的评论让我思考了一个行为。我认为 ActiveAware 行为可能是一个很好的模型，可以跟踪活动/非活动事件并可能对它们采取行动。
以下是 ActiveAware 行为的源代码。我很确定，您可以使用此模型作为执行您想要的行为的起点。
http://compositewpf.codeplex.com/SourceControl/changeset/view/26112# 496678
Unfortunately (as you found out) this is not the behavior. You'll have to track your views and activate the previous one yourself.
Jeremiah commented and made me think about a behavior for this. I think the ActiveAware behavior is probably a good model for a behavior that would track active / inactive events and possibly act on them.
Here's the source code for the ActiveAware behavior. You could use this model as a starting point for a behavior that does what you want, I'm pretty sure.
http://compositewpf.codeplex.com/SourceControl/changeset/view/26112#496678