Caliburn.Micro - 当视图可见时执行某些操作
我目前正在研究 WPF 和 Caliburn.Micro，暂时没有像 MEF 或 Autofac 这样的东西。
现在我正在尝试在视图模型可见后立即执行视图模型中的一些代码。
在相关教程中，此代码在显示视图之前显示一个消息框：
protected override void OnActivate()
{
MessageBox.Show("Page Two Activated"); //Don't do this in a real VM.
base.OnActivate();
}
Eisenberg 先生随后写道：
请记住，如果您有任何依赖于 视图已加载，您应该覆盖 Screen.OnViewLoaded 代替/与 OnActivate 结合使用。
这就是我所拥有的：
protected override void OnViewLoaded(object view)
{
base.OnViewLoaded(view);
MessageBox.Show("OnPageTwoViewLoaded");
}
我还通过 Grid EventTrigger 和 cal:ActionMessage 进行了尝试。 但在所有三种情况下，MessageBox 都会在视图可见之前出现。
我肯定错过了一些东西，我做错了什么？
I am currently getting into WPF and Caliburn.Micro ,for now without something like MEF or Autofac.
Right now i am trying to execute some code in a viewmodel right after its view becomes visible.
In a related tutorial this code displays a messagebox just before a view is shown:
protected override void OnActivate()
{
MessageBox.Show("Page Two Activated"); //Don't do this in a real VM.
base.OnActivate();
}
Mr. Eisenberg then writes this:
Remember, if you have any activation logic that is dependent on the
view being already loaded, you should override Screen.OnViewLoaded
instead of/in combination with OnActivate.
This is what i have:
protected override void OnViewLoaded(object view)
{
base.OnViewLoaded(view);
MessageBox.Show("OnPageTwoViewLoaded");
}
I also tried it via a Grid EventTrigger and a cal:ActionMessage.
But in all three cases the MessageBox appears before the view is visible.
Surely i am missing something, what am i doing wrong?
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也许不是最优雅的解决方案，但我想你可以从代码隐藏中做到这一点，因为严格来说，这是你试图在这里做的一个非常视图/GUI 特定的事情。例如在 OnInitialized 或 OnRender 中。如果您为视图提供对 EventAggregator 的引用，则可以引发一个事件并创建视图模型 - 或任何您想要的类，订阅此事件并执行该操作。或者在显示 MessageBox 的情况下，除了 View 之外，您实际上不会在其他任何地方看到它。
Maybe not the most elegant solution, but I guess you can do this from the code-behind, since - strictly speaking - this is a very view/gui specific thing you're trying to do here. For instance in OnInitialized or OnRender. If you give your view a reference to the EventAggregator, you could raise an event and make the view model - or whatever class you want, subscribe to this event and do it's thing. Or in the case of showing a MessageBox, you really wouldn't have that any place else than in the View anyway.