无法使用c#导航到Windows Metro App上的页面 [英] Not able to navigate to pages on Windows Metro App using c#
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问题描述
在加载UserLogin
页面时,我要检查用户数据库,如果该数据库不存在或无法读取,我希望将其定向到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));
}
问题在于,即使我注释掉if
条件,它也永远不会导航到NewUser
.
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
方法中调用.您应该通过Dispatcher
调用代码,它将起作用:
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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