使用Prism EventAggregator.

With Prism EventAggregator.

1..创建要发布的事件

public class CloseTabEvent : PubSubEvent<TPayload>
    {

    }

其中TPayload是您要传递的类型(int, string, or even class object)

where TPayload is type you are passing(int, string, or even class object)

2..在您的关闭按钮所在的子视图中，发布该事件. 在您的关闭按钮Command(执行方法)中，发布该事件.

2. In your subView where your close button is, publish that event. In your close button Command (execute method) u publish that event.

private void OnCloseExecuted(object obj)
{
_eventAggregator.GetEvent<CloseTabEvent>().Publish(SomethingThatYouPublis..ThisIsTPayload);
}

在您的subView构造函数中，传递IEventAggregator并创建一个私有字段.

In your subView constructor pass IEventAggregator and make a private field.

private IEventAggregator _eventAggregator;
public SubViewModel(IEventAggregator eventAggregator)
{
_eventAggregator = eventAggregator;
}

3..在mainViewModel中，您还传递了IEventAggregator并在构造函数内进行订阅.

3. In your mainViewModel you also pass IEventAggregator and subscribe inside constructor.

public MainViewModel((IEventAggregator eventAggregator)
{
    eventAggregator.GetEvent<CloseTabEvent>
   ().Subscribe(MethodForClosingThatSpecificTab);
}

就是这样.

重要提示::使用某些IoC(Unity，Autofac ..)解析IEventAggregator时，请使其成为单例，因此它是整个应用程序中的一个.

IMPORTANT: When resolving IEventAggregator with some IoC(Unity, Autofac..) make it singleton, so it's one for whole app.