简单事件的处理MVVM [英] Simple Event Handling in MVVM

问题描述

只是想知道是什么人了的想法就如何最好地处理在View从控制在一个视图模型的事件......以最轻量级的方式。

Just wondering what people had for ideas on how best to handle events in a ViewModel from controls on a View ... in the most lightweight way possible.

例如：

<MediaElement
     MediaOpened={Binding SomeEventHandler} />

在这种情况下，我们要处理的视图模型的MediaOpened事件。如果没有一个像棱镜的框架，人们将如何绑定这一个ViewModel？

In this case we want to handle the MediaOpened event in a ViewModel. Without a framework like Prism, how would one bind this to a ViewModel?

推荐答案

指挥 - 你SomeEventHandler需要一个类实现的ICommand ...有文学可用堆在线...

Commanding - your 'SomeEventHandler' needs to be a class that implements ICommand... there's a heap of literature available online...

此外 - 我会考虑让一个免费的，轻量级的'小'MVVM框架，比如 MvvmFoundation ，它提供在RelayCommand为这样一个目的（不学习PRISM的复杂性/开销）

Also - I would consider getting a free, lightweight 'mini' MVVM framework, such as MvvmFoundation, which provides the RelayCommand for just such a purpose (without the complexity/overhead of learning PRISM)

编辑：

看一看<一个href=\"http://geekswithblogs.net/HouseOfBilz/archive/2009/08/27/adventures-in-mvvm-ndash-binding-commands-to-any-event.aspx\">this博客用于连接命令无论如何...这是令人难以置信的强大，正如我所说的，但我猜你需要做一个判断调用，如果这是你想要的，喜欢的东西附加一个老式的事件，以及使用比较在后面，你的code超薄的机身事件处理程序只是调用了一些方法，在你的视图模型，是这样的：

Have a look at this blog for attaching command to any event... It is incredibly powerful, as I mentioned, but I guess you do need to make a judgement call if this is what you want, compared with something like attaching an old-fashioned event, and using a super-slim event handler in your code behind that simply invokes some method on your ViewModel, something like:

public void SomeEventHandler(object sender, SomeEventArgs e)
{
    MyViewModel vm = (MyViewModel)this.DataContext;
    vm.HandleLoadEvent( );
}

务实VS最佳实践...我跟你走的。）

pragmatic vs Best-practise... I'll leave it with you ;)

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