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如何在wpf mvvm应用程序中显示消息框？

[英]how to show a message box in a wpf mvvm application?

原文 2014-03-17 18:09:50 1 1 c#/ wpf/ mvvm

I have an application whch is written in WPF and is based on MVVM. 我有一个应用程序是用WPF编写的，并且基于MVVM。

In part of this application, I am doing a very long processing and at the end of it I want to ask a question from user such as processing finished, do you want to reset data? 在此应用程序的一部分中，我正在做一个很长的处理，最后，我想向用户提出一个问题，例如处理完成，是否要重置数据？

I am doing this by showing a message box and it do the job, but I belive it is not a good solution as my ViewModel showing something to user . 我通过显示一个消息框来做到这一点，它可以完成工作，但是我相信这不是一个很好的解决方案，因为ViewModel向用户显示了一些东西。

What is the best way to implement such messagebox? 实现这种消息框的最佳方法是什么？

I read the answer to similar questions here but all of them related to input validation, whish is not the case here. 我在这里阅读了类似问题的答案，但所有这些问题都与输入验证有关，而事实并非如此。 In my case, I am asking a question which is not related to data validation and hence data vlidation methods doesn't work here. 就我而言，我问的一个问题与数据验证无关，因此数据滑动方法在这里不起作用。

1 个解决方案

An elegant way would be using a "MessageRequest" that is raised in the ViewModel and handled in the View (--> Interactions) or an Interaction Service defined in the View Layer. 一种优雅的方法是使用在ViewModel中引发并在View（-> Interactions）或在View Layer中定义的Interaction Service处理的“ MessageRequest”。 Thus, the ViewModel wouldn't decide HOW the message is shown, as this is part of the UI. 因此，ViewModel不会决定如何显示消息，因为这是UI的一部分。 See http://msdn.microsoft.com/en-us/library/gg405494(v=pandp.40).aspx#sec11 and following section for a good example. 请参见http://msdn.microsoft.com/zh-cn/library/gg405494(v=pandp.40).aspx#sec11和以下部分，以获取一个很好的示例。