ViewModel中的NavigationService [英] NavigationService in ViewModel

问题描述

你好

那我有什么问题?我使用MVVM开发WP应用程序.问题是，我无法在ViewModel中使用NavigationService.网络上有一些有关此问题的文章.我尝试了这个解决方案 http://geekswithblogs.net/lbugnion/archive/2011/01/06/navigation-in-a-wp7-application-with-mvvm-light.aspx .工作正常但是只有2种方法和1个事件.原始的NavigationService更复杂.你怎么看?我应该创造更多东西吗?

so what's my problem? I develop WP application using MVVM. Problem is, i cannot use NavigationService in ViewModel. Some articles are on web about this problem. I tried this solution http://geekswithblogs.net/lbugnion/archive/2011/01/06/navigation-in-a-wp7-application-with-mvvm-light.aspx . It's working. But only 2 methods and one event. Original NavigationService is more complex. What do you think? Should I create more things?

其他解决方案:我可以使用PhoneApplicationFrame.Navigate导航到上一页，但是它会创建新实例.

Other solution: I could use PhoneApplicationFrame.Navigate to navigate to previous page, but it creates new instance.

推荐答案

I在决定如何构建它方面也很困难.我的ViewModel位于可移植类库(PCL)中，增加了一层分隔，因此Windows Store应用程序也可以使用它们.我认为没有什么比现成的解决方案更容易/更容易了 除了您提供的链接.我可能错过了一些东西，但是听起来您需要在ViewModels中滚动自己的导航管理器.这不是我想冒险的事情，所以我要牺牲我的MVVM模型的纯度来制作单行 导航调用后面的代码.如果您找到更好的方法，请发表！

I'm having a hard time deciding how to build this as well. My ViewModels are in a Portable Class Library (PCL), adding a layer of separation, so they can be used by a Windows Store app as well. I don't think are are any easier\out of the box solutions aside from the link you provided. I might have missed something, but it sounds like you would need to roll your own nav manager in your ViewModels. This isn't something I want to venture into so I'm sacrificing the purity of my MVVM model to make single line navigation calls in the code behind. Please post if you find a better approach!

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