In Windows Phone 8 and earlier versions , we had the launcher called “MarketplaceReviewTask” that launches the Rate and Review app . There are times when you want to launch the Rate and Review App from your Application when developing Windows Phone 8.1 (XAML App) or Universal App.
MarketplaceReviewTask in Windows Universal Apps
You can use the Windows.System.Launcher.LaunchUriAsync method and provide the Uri scheme to launch the app as shown below.
string AppId = CurrentApp.AppId; await Windows.System.Launcher.LaunchUriAsync( new Uri("ms-windows-store:reviewapp?appid=" + AppId ));