RoutedEventArgs与EventArgs [英] RoutedEventArgs vs EventArgs

问题描述

我正在学习WPF / Silverlight，并在MS视频中看到现在建议使用 RoutedEventArgs 超过 EventArgs ;虽然它并没有说明为什么。

我有一个赢取表单应用程序，使用widgets的接口，试图不绑定到特定的显示技术（在Presenters / ViewModels），所以如果我的IButton Click事件现在需要采取 RoutedEventArgs 现在我猜这是没有用的。

有人可以解释一下，如果我应该切换到所有情况下的 RoutedEventArgs ，为什么？

除此之外，还有其他人在使用界面小部件时有其他的经验/观点吗？

解决方案

一个 RoutedEvent 通过 Logical 树，从源元素到根元素（ Bubble 事件路由），或者从根元素到子级别元素（ Tunnel 事件路由）不太频繁。这意味着如果您在 StackPanel 内部有一个 Button ，那么它本身就在网格;如果您在控件中定义单击事件，它们将触发它们，除非其中一个处理。

如果事件路由是 Bubble （命名为常规事件单击），它将会：

按钮 - > StackPanel - >网格

如果事件路由是隧道（命名为预览点击），它将以其他方式：

网格 - > StackPanel - >按钮

所以现在使用处理，这很简单。如果它是一个 Bubble 路由，而 Button 设置 RoutedEventArgs.Handled 为true，那么 StackPanel 和 Grid 将不会触发它。与 RoutedEvent 相同，如果 Grid 处理它，则 StackPanel 和 Button 不会触发它。

这是我的理解，简而言之，我避免了一些东西简单。

我推荐本章，以便更好地了解此WPF功能。 >

I am learning WPF / Silverlight and saw in an MS vidcast that it is now recommended to use RoutedEventArgs over EventArgs; although it didn't say exactly why.

I have a win forms app that uses interfaces for "widgets" in an attempt to not be tied to a specific display technology (in Presenters / ViewModels), so if my IButton Click event now needs to take the RoutedEventArgs now I guess it isn't as useful.

Can someone please explain if I should switch to RoutedEventArgs in all cases and why?

As an aside, does anyone else have experience / opinions about using interface widgets as I'm describing them?

解决方案

Well, basically a RoutedEvent travels through the Logical tree, either from the source element to root element (Bubble event route) or, less frequently from root element to sub levels elements (Tunnel event route). What this means is that if you have a Button inside of a StackPanel, that itself is inside of a Grid; if you define a Click event in the controls they will all trigger it unless one of them handles it.

If the event route is Bubble (named as a regular event Click), it will go:

Button -> StackPanel -> Grid

If the event route is Tunnel (named PreviewClick), it will go the other way around:

Grid -> StackPanel -> Button

So now with the handling, it's pretty simple. If it's a Bubble route and the Button sets the RoutedEventArgs.Handled to true, that StackPanel and Grid will not trigger it. Same with the RoutedEvent, if the Grid handles it, the StackPanel and Button will not trigger it.

This is my understanding in a nutshell, I avoided some stuff for simplicity.

I recommend this chapter for better understanding of this WPF feature.

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