MVVM-视图模型 - 视图模型通信 [英] MVVM- View Model-View Model Communications

问题描述

如何使用MVVM Light将两个视图模型相互通讯？我知道如何使用信使类和注册等。这是我的场景

How do I go about having two view models communicate with one another using MVVM Light. I know how to use the messenger class and register etc.. Here is my Scenario

A Settings View ---> a Settings View Model 
                                  .
                                  .
                                  .

A MainPage View ---> A MainPage ViewModel

如果设置视图中的内容发生变化，那么Message将返回设置视图模型。所以我想要设置视图模型与MainPage视图模型通信有关改变。那么MainPage ViewModel将会告诉我们的观点。

If something changes in the Settings View it will Message back to the Settings View Model. So then I want the Settings View Model to communicate to the MainPage View Model about what changed. THe MainPage ViewModel will then tell the View.

推荐答案

这种风格的常见模式是 Mediator （两个视图模型引用的类，可用于在两者之间传递消息）。

A common pattern for this style of problem is Mediator (a class that both view models reference and can be used to pass messages between the two).

Mediator类已被移动到 Cinch WPF / SL MVVM框架 ，似乎仍然积极开发/支持。

The Mediator class has since been moved to the Cinch WPF/SL MVVM Framework, which appears to still be actively developed/supported.

我喜欢的模式是事件聚合，一个例子可以在Prism框架中找到。在这种模式下，不同的视图模型订阅聚合器中的事件，其他发布事件。

The pattern I prefer is the Event Aggregator, an example can be found in the Prism framework. In this pattern different view models subscribe to events from the aggregator and others publish events.

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