Question

我在项目中使用Mvvmlight INavigationService，从视图模型导航到视图，并将对象作为参数传递，如何在视图模型或后面的代码中获取。

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;
    }

查看模型命令执行

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

        }

Page I导航到

 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”，但是不能转换为我的类对象，我可以在视图模型中或在代码隐藏中获取值，这是最好的方法，使用最少的代码代码隐藏？

Mvvmlight版本：Mvvmlight 5 Laurent Mvvmlight 5 Announcement

I have also referred this

Answer 1

您可以使用NavigationService来评估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;

在View Model Windows Phone 8中获取导航数据

1 个答案: