How do I determine if the platform is Windows or Windows Phone when running the Universal Windows app?

Use the Windows.Security.ExchangeActiveSyncProvisioning.EasClientDeviceInformation class.The code below tells you whether the platform you are running is WindowsPhone or not (Windows):

As written in C#, the same API is available from C++, Visual Basic, and JavaScript.

bool DetectIfRunningOnWindowsPhone()
    {
        varinfo=new Windows.Security.ExchangeActiveSyncProvisioning.EasClientDeviceInformation();
        return(info.OperatingSystem.Equals("WindowsPhone"))?true:false;
    }

See also http://msdn.microsoft.com/ja-jp/library/windows/apps/windows.security.exchangeactivesyncprovisioning.easclientdeviceinformation.aspx.

In addition to EasyClientDeviceInformation, other simple methods include:

• Get the name of the assembly that contains the App class by reflection (the creator should be able to distinguish!)

• Determine by the Windows.ApplicationModel.Store.CurrentApp.LinkUri property (=URI of the web page of the store where the app is located)

Get the name of the assembly that contains the App class by reflection (the creator should be able to distinguish!)

Determine by Windows.ApplicationModel.Store.CurrentApp.LinkUri property (=URI of the web page of the store where the app is located)

@IT: WinRT/Metro TIPS: How do I separate logic between Windows and my phone?[Universal Windows Application Development]

http://msdn.microsoft.com/ja-jp/library/windows/apps/dn609832.aspx#CrossPlatform

For Windows and Windows Phone projects, click Why don't you take advantage of the values defined as conditional compilation symbols?

public bool IsPhone = false;

# if WINDOWS_PHONE_APP
        IsPhone = true;
#endif

I don't use the API or anything, so I don't think it's good...