MVVM 中的简单事件处理 [英] Simple Event Handling in MVVM

问题描述

只是想知道人们对如何最好地从 View 上的控件处理 ViewModel 中的事件有什么想法......以尽可能最轻量的方式.

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.

示例:

<MediaElement
     MediaOpened={Binding SomeEventHandler} />

在这种情况下，我们希望在 ViewModel 中处理 MediaOpened 事件.如果没有像 Prism 这样的框架，如何将它绑定到 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

Commanding - 你的SomeEventHandler"需要是一个实现 ICommand 的类......网上有很多文献......

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

另外 - 我会考虑获得一个免费的、轻量级的迷你"MVVM 框架，例如 MvvmFoundation，它为这样的目的提供了 RelayCommand(没有学习 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)

看看 this 用于将命令附加到任何事件的博客......正如我所提到的，它非常强大，但我想如果这是你想要的，与类似于附加一个老式事件，并在后面的代码中使用超薄事件处理程序，它只是调用 ViewModel 上的某些方法，例如:

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( );
}

务实与最佳实践......我会留给你;)

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

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