Xamarin main method or equivalent

xamarin invokeonmainthread
xamarin essentials
xamarin android invoke on main thread
xamarin forms threading
xamarin background thread
xamarin begininvokeonmainthread async
document xamarin
xamarin package version

I'm new to Xamarin and I'm looking for an entry point like a main() method. Also, I have a data storage (i.e. model) class, which constantly receives data from a web socket and shall be accessible from throughout the application (i.e. from multiple ViewModels). Where can I put significant and central classes like these? Would you put these in a static class?

Also: Is there something like a main-loop which is responsible for handling tasks and events?

I'd be very grateful for a generic/primer overview of all the "entry points" within a Xamarin application.

If you for example create a Cross Platform Mobile App in Visual Studio 2017 you will already get a scaffold. The data layer is located in the 'Services' Folder.

I would consider the "App.xaml" file as your entry point.

   public partial class App : Application
    //TODO: Replace with *.azurewebsites.net url after deploying backend to Azure
    public static string AzureBackendUrl = "http://localhost:5000";
    public static bool UseMockDataStore = false;
    public static bool UseEntityFramework = true;

    public App()

        if (UseMockDataStore)
        else if (UseEntityFramework)

        MainPage = 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

UIApplication.Main Method (UIKit), using Xamarin.Essentials;. To run code on the main thread, call the static MainThread.BeginInvokeOnMainThread method. The argument is an  There is no built-in equivalent to an ItemsControl in Xamarin.Forms; but there is a custom one for Xamarin.Forms available here. User Controls. In WPF, UserControls are used to provide a section of UI which has associated behavior. In Xamarin.Forms, we use the ContentView for the same purpose. Both support binding and inclusion in XAML.

Xamarin.Essentials: MainThread, Program '(my app name)' does not contain a static 'Main' method suitable for an entry point. I have no clue why this happens. Is there some  Remarks. This example shows how to set the Text of Label on the main thread, e.g. in response to an async event.

Xamarin suddenly can't find the static 'Main' method, The HelloWorld app, similar to any other C# app, begins its execution from the static Main method of the Application class. This applies regardless of whether  ⊕ Xamarin.Forms: a framework for simple apps and prototypes. Xamarin suggests developers build mobile apps in two ways. The first one is to use Xamarin.iOS and Xamarin.Android, which is considered the main approach. Using Xamarin.Forms, the Visual Studio Library is the second one.

In Android you can override the default MainActivity like below:

Beginning Xamarin Development for the Mac: Create iOS, watchOS, , I'm new to Xamarin and I'm looking for an entry point like a main() method. Also, I have a data storage (i.e. model) class, which constantly receives data from a  The Xamarin.Forms MessagingCenter class implements the publish-subscribe pattern, allowing message-based communication between components that are inconvenient to link by object and type references. This mechanism allows publishers and subscribers to communicate without having a reference to each other, helping to reduce dependencies between them.

Xamarin Doctor, Init(this, bundle); LoadApplication(new App()); } } iOS Hosting Xamarin The iOS project hosting Xamarin.Forms contains the Main method with the invocation of  If you are using Xamarin Essentials 1.5, then you can use Platform.CurrentActivity. This is basically the equivalent of using the CurrentActivity plugin. Ensure you initialise this correctly as per the instructions ie. in MainActivity OnCreate add the following line

Professional C# 7 and .NET Core 2.0, There are two main ways to customize a control: by property or by replacing the entire main method fires upon changes to the element and is used for control  Xamarin’s Mono-based products enable .NET developers to use their existing code, libraries and tools (including Visual Studio*), as well as skills in .NET and the C# programming language, to create mobile applications for the industry’s most widely-used mobile devices, including Android-based smartphones and tablets, iPhone, iPad and iPod Touch.

Xamarin Mobile Application Development: Cross-Platform C# and , Xamarin vs Native iOS/Android vs Hybrid Development. Piece of Xamarin.​Android, which is considered the main approach. Xcode IDE, similar to VS, supports source code for all major programming languages. So, there  Xamarin.Forms 1.4 introduced an additional method on the Application class - SavePropertiesAsync() - which can be called to proactively persist the Properties dictionary. This is to allow you to save properties after important updates rather than risk them not getting serialized out due to a crash or being killed by the OS.

  • Yeah I already thought about putting stuff in the App.xaml file. I found it a little "hidden", tho. I read about the partial class aspect of being helpful. I can I make use of that?
  • The "App.xaml" file is located on the root of your project, so you can easily find it. "Partial" means it completes the already existing App class in the UWP project. You could even create your own "public partial class App" in a separate file, but that would needlessly complicate it. I would first try to set up your datasource in the "Services" folder.
  • Thank you very much, but, BL?
  • its Business Layer
  • It caught me out the App class in the UWP namespace (and project) is different to the App class in the shared Forms namespace (and project). I had equated the two in my mind and was getting very confused as to which was created first.