问题
guys, I have a problem with my Store App (Windows 8.1), I don't know the motive.

The LoadStateEventArgs don't load.
I put the using assembly using Windows.UI.Xaml.Navigation;
and don't work.
How fix it?
回答1:
NavigationHelper
and LoadStateEventArgs
aren't defined in any of the assemblies; they're included directly in your project when you add a new item based on the Basic Page
template:

Once you do that, a couple of file are added to the Common
folder:

Among them is also NavigationHelper.cs
which contains both missing classes. Their namespace matches the folder (App1.Common
in my case).
来源:https://stackoverflow.com/questions/27651752/loadstateeventargs-cant-loaded