I recently working on a Windows 8.1 App, which was developed with C# and XAML. SharePoint Online is used for Data store.
I searched and found that Wictor solution can be used for Authentication. but the problem is that we can not use Wictor solution [http://www.wictorwilen.se/Post/How-to-do-active-authentication-to-Office-365-and-SharePoint-Online.aspx] directly as it is built upon .Net framework and Metro Apps are built upon .NetCore.
One possible option is to use WCF service and have whole Wictor solution in WCF service then call WCF service from Windows App. I tested it and it is working fine.
However, I wanted to know what would be the best approach available if I don't want to deploy this WCF separately. In future I have to publish this Win App on Windows store.
Any help will be appreciated.
Thanks