I am new in MVVM. I just learn this pattern and want to use it in my project. I am already understand working principle of this pattern and learned how to use Commands. But I have question how to handle events of another controls for example ListBox SelectionChanged event. ListBox haven't Command attribute
我是MVVM的新手。我只是学习这种模式，并希望在我的项目中使用它。我已经理解了这种模式的工作原理，并学会了如何使用命令。但我有问题如何处理另一个控件的事件，例如ListBox SelectionChanged事件。 ListBox没有Command属性
3 个解决方案
#1
14
You often don't need to. For example, you can just bind the ListBox's SelectedItem property to a property on your view model:
你经常不需要。例如，您可以将ListBox的SelectedItem属性绑定到视图模型上的属性：
<ListBox ItemsSource="{Binding Customers}" SelectedItem="{Binding SelectedCustomer, Mode=TwoWay}"/>
Not only does this give you access to the selected customer in your view model, it also allows your view model to dictate the selected customer by setting the property itself.
这不仅可以让您访问视图模型中的选定客户，还可以让您的视图模型通过设置属性本身来指定所选客户。
There are other techniques to "avoid" direct handling of events in your code-behind, too. For example, attached behaviors. However, you shouldn't be scared of handling events directly if the code is solely concerned with the view and makes your code simpler.
还有其他技术可以“避免”直接处理代码隐藏中的事件。例如，附加行为。但是，如果代码只关注视图并使代码更简单，则不应该害怕直接处理事件。
#2
0
To add command attribute to your control, it has to inherit from ICommandSource. Check this post, to see how it's accomplished.
要向控件添加命令属性，它必须从ICommandSource继承。查看这篇文章，看看它是如何完成的。
#3
0
The BookLibraray application of the WPF Application Framework (WAF) shows how to listen to WPF events in a Model-View-ViewModel (MVVM) designed application. It allows a user to select multiple books so that he can delete all of them at once. See class BookLibrary.Presentation.Views.BookView.
WPF应用程序框架（WAF）的BookLibraray应用程序演示了如何在Model-View-ViewModel（MVVM）设计的应用程序中监听WPF事件。它允许用户选择多本书，以便他可以一次删除所有书籍。请参阅BookLibrary.Presentation.Views.BookView类。
#1
14
You often don't need to. For example, you can just bind the ListBox's SelectedItem property to a property on your view model:
你经常不需要。例如，您可以将ListBox的SelectedItem属性绑定到视图模型上的属性：
<ListBox ItemsSource="{Binding Customers}" SelectedItem="{Binding SelectedCustomer, Mode=TwoWay}"/>
Not only does this give you access to the selected customer in your view model, it also allows your view model to dictate the selected customer by setting the property itself.
这不仅可以让您访问视图模型中的选定客户，还可以让您的视图模型通过设置属性本身来指定所选客户。
There are other techniques to "avoid" direct handling of events in your code-behind, too. For example, attached behaviors. However, you shouldn't be scared of handling events directly if the code is solely concerned with the view and makes your code simpler.
还有其他技术可以“避免”直接处理代码隐藏中的事件。例如，附加行为。但是，如果代码只关注视图并使代码更简单，则不应该害怕直接处理事件。
#2
0
To add command attribute to your control, it has to inherit from ICommandSource. Check this post, to see how it's accomplished.
要向控件添加命令属性，它必须从ICommandSource继承。查看这篇文章，看看它是如何完成的。
#3
0
The BookLibraray application of the WPF Application Framework (WAF) shows how to listen to WPF events in a Model-View-ViewModel (MVVM) designed application. It allows a user to select multiple books so that he can delete all of them at once. See class BookLibrary.Presentation.Views.BookView.
WPF应用程序框架（WAF）的BookLibraray应用程序演示了如何在Model-View-ViewModel（MVVM）设计的应用程序中监听WPF事件。它允许用户选择多本书，以便他可以一次删除所有书籍。请参阅BookLibrary.Presentation.Views.BookView类。