在View Model Windows Phone 8中获取导航数据 [英] Get Navigation data in View Model Windows phone 8

问题描述

我在项目中使用Mvvmlight INavigationService，从视图模型导航到视图，然后将对象作为参数传递，如何在视图模型或背后的代码中获取信息.

I'm using Mvvmlight INavigationService in the project, from view model I navigate to a view , and pass object as parameter ,how do I get either in the view model or in the code behind.

我已基于此实现

我的视图模型定位器

private static INavigationService CreateNavigationService()
    {
        var navigationService = new NavigationService();

        navigationService.Configure("topupdetails", new System.Uri("/Views/TopUpDetails.xaml", System.UriKind.Relative));

        return navigationService;
    }

视图模型命令执行

private void OnTapCommand(MyModel tappedItem)
    {
        if (tappedItem._verified)
        {
        SimpleIoc.Default.GetInstance<INavigationService>().NavigateTo("topupdetails",tappedItem);

        }

我浏览到的页面

 protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        if (NavigationContext.QueryString.Any())
        {
            var item = NavigationContext.QueryString.Values.First();

        }
        base.OnNavigatedTo(e);
    }

在查询字符串中，我只是像这样的"e-fghfdsfsd"值，但不能转换为我的类对象，我可以在视图模型中或在后面的代码中获取值，这是用最少的代码做到这一点的最佳方法在代码背后?

In query string I just value like this "e-fghfdsfsd" but cant cast to my class object , Can I get the value in view model or in the code-behind which is best way to do this , with a minimum code in code-behind ?

Mvvmlight版本:Mvvmlight 5

Mvvmlight Version: Mvvmlight 5 Laurent Mvvmlight 5 Announcement

我也提到了这个

推荐答案

您可以使用NavigationService评估NavigationContext:

You can use the NavigationService to evaluate the NavigationContext:

GalaSoft.MvvmLight.Views.NavigationService _navigationService = [..] // Get your NS instance here or create a new one.
var m = _navigationService.GetAndRemoveParameter(NavigationContext);
// Try to cast:
MyModel model = m as MyModel;
// Deny if it's not a valid object
if (model == null)
    return;

这篇关于在View Model Windows Phone 8中获取导航数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！