Xamarin - Type or name of application namespace not found

Question

This error is currently trying to launch the Xamarin app for my iPhone in real time.

"AppDelegate.cs(1,1): error: The type or namespace name 'App' could not be found (are you missing a using directive or an assembly reference?)" 

My solution builds without errors, so it’s a bit stuck. These errors did not occur until I updated to the last update. Any help is appreciated.

App.xaml.cs:

 using System; using System.Collections.Generic; using System.Linq; using System.Text; using COCApp; using Xamarin.Forms; namespace COCApp { public partial class App : Application { public App() { InitializeComponent(); MainPage = new NavigationPage(new MainPage()); } protected override void OnStart() { // Handle when your app starts } protected override void OnSleep() { // Handle when your app sleeps } protected override void OnResume() { // Handle when your app resumes } } } 

Appdelegate.cs

 using System; using System.Collections.Generic; using System.Linq; using COCApp; using Foundation; using UIKit; namespace COCApp.iOS { // The UIApplicationDelegate for the application. This class is responsible for launching the // User Interface of the application, as well as listening (and optionally responding) to // application events from iOS. [Register("AppDelegate")] public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate { // // This method is invoked when the application has loaded and is ready to run. In this // method you should instantiate the window, load the UI into it and then make the window // visible. // // You have 17 seconds to return from this method, or iOS will terminate your application. // public override bool FinishedLaunching(UIApplication app, NSDictionary options) { global::Xamarin.Forms.Forms.Init(); LoadApplication(new App()); return base.FinishedLaunching(app, options); } } } 

Answer 1

I had a similar problem for Android and iOS, but mine would work fine and fine if there weren’t a red underline in the app for both projects.

I installed it by right-clicking on the "Links for Android" → "Add Link" - "Projects" link, and then uncheck the already included shared project by clicking "OK". Then I re-added the general project and fixed the error.

Note that PCL no longer works when starting the Xamarin.Forms project in the latest version of Visual Studio, now its .Net standard.

Answer 2

Check your project to make sure it has a link to the PCL.