TwoWay手动绑定实现ListBox.SelectedItems？ [英] TwoWay Manual Binding Implementation for ListBox.SelectedItems?

问题描述

我一直在试图看看是否有一个简单/聪明的方法来实现绑定到ListBox.SelectedItems。如果您尝试过自己，您将知道，使用BindingExtension的标记绑定将无法正常工作 - 该属性不支持它。所以你要配置一个用于SelectionChanged并尝试该路由的处理程序。我最接近的是这篇文章：

I've been trying to see if there is an easy/clever way to implement binding to ListBox.SelectedItems. If you have tried yourself, you will know, that markup binding using BindingExtension will not work - the property doesn't support it. So you are left with wiring up a handler for SelectionChanged and trying that route. The closest I've gotten is this post:

http://alexshed.spaces.live.com/blog/cns!71C72270309CE838!149.entry

http://alexshed.spaces.live.com/blog/cns!71C72270309CE838!149.entry

更新：上述博客不再可用，该作者的当前博客在这里，最接近我参考的博客文章是此StackOverflow答案。

Update: the above mentioned blog is no longer available, that author's current blog is here and the closest I could find to the referenced blog post is this StackOverflow answer.

它在一个方便的附加属性中实现了所有必需的C＃。但它实现了约束力作为单向目标来源。我想要双向绑定。

Which implements all the necessary C# in a handy attached property. But it implements the "binding" as a One-Way, Target to Source. I'd like Two-Way binding.

任何想法？

推荐答案

p>我发现了一个优雅的解决方案，我刚刚找到时间写一个关于它的博文。

I've found an elegant solution, and I've just found time to write a blog post about it.

我所做的是创建一个附加属性，可以在ListBox（或DataGrid实际上）上设置的SynchronizedSelectedItems）。你将它数据绑定到一个集合，然后，有一点魔法，ListBox上的SelectedItems属性和你的集合保持同步。您可以从我的博客文章中下载所有代码。

What I did was to create an attached property, SynchronizedSelectedItems that you can set on the ListBox (or DataGrid in fact). You databind this to a collection, and then, with a bit of magic, the SelectedItems property on the ListBox and your collection are kept in sync. You can download all the code from my blog post.

魔术是在两个集合中侦听CollectionChanged事件的类，并将更改传播到另一个。

The "magic" is a class which listens out for CollectionChanged events in either collection, and propagates the changes to the other.

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