无法使用 c# 导航到 Windows Metro App 上的页面

问题描述

当我的 UserLogin 页面加载时，我想检查用户数据库，如果它不存在或无法读取，我想将其定向到 NewUser 页面.

When my UserLogin page loads, i want to check for user database, and if it doesn't exist, or can't be read, i want to direct it to NewUser page.

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    CheckForUser();
    if (UserExists == false)
        this.Frame.Navigate(typeof(NewUser));
}

问题是它永远不会导航到 NewUser，即使我注释掉 if 条件.

The problem is that it never navigates to NewUser, even when i comment out the if condition.

推荐答案

Navigate 不能直接从 OnNavigatedTo 方法调用.您应该通过 Dispatcher 调用您的代码，它会起作用:

Navigate can't be called directly form OnNavigatedTo method. You should invoke your code through Dispatcher and it will work:

protected override void OnNavigatedTo(NavigationEventArgs e)
{
    base.OnNavigatedTo(e);
    CheckForUser();
    if (UserExists == false)
        Dispatcher.RunAsync(CoreDispatcherPriority.Normal, 
                            () => this.Frame.Navigate(typeof(NewUser)));
}

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