Best Practices: Upgrade to Windows 10 UWP Universal apps

– You have Windows Phone 8.x and Windows 8.x apps and want to upgrade the app to UWP Universal for Windows 10 to take advantage of new API platform?
– You just only want to update the Windows app to UWP but leave the phone app version in 8.x for some reason ex: AdMob SDK has not yet supported for Windows Phone 8.1 or later. Here are some best practices for you:
1. To target your UWP app only for Windows 10 devices without phone version
Open the Package.appxmanifest file then edit the Dependencies as below
    <!--<TargetDeviceFamily Name="Windows.Universal" MinVersion="" MaxVersionTested="" />-->
    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.10240.0" MaxVersionTested="10.0.10240.0" />
For this setting, you cannot deploy your app to Emulator or phone devices. And then when you upload the package to store, you will see the instruction below “Device families: Windows.Destop minverion 10.0.10240.0”
For more detail please visit msdn link here
2. Your UWP app using some extra features as access user appointments, contacts…but you do not see that capabilities in Package.appxmanifest to declare.
The solution is open Package.appxmanifest file then edit the node Capabilities as below:
    <Capability Name="internetClient" />
    <uap:Capability Name="appointments" />
For more detail please visit msdn link here
3. You want to create settings page for your UWP looks like Microsoft Mail Universal app, which display the page flyout on the right. With Windows 8.x this will be completed by using SettingFlyout template, but the template is not supported for Windows 10 UWP.
Solution is create a new page or usercontrol then change the page/usercontrol class to inherit to Windows.UI.Xaml.Controls.SettingsFlyout. In UWP app the SettingsFlyout control is not visible in template selection but it still there in code.
public sealed partial class SettingsFlyoutControl : SettingsFlyout

Hope this help!

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