AppDelegate.PerformFetch(UIApplication, UIBackgroundFetchResult)': no suitable method found to override

Jassim Al Rahma 1,556 Reputation points


I am trying to use background service in .NET MAUI app and here is my AppDelegate:

using Foundation;
using UIKit;
using UserNotifications;

namespace MyApp;

public class AppDelegate : MauiUIApplicationDelegate
    protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();

    protected override async void PerformFetch(UIApplication application, UIBackgroundFetchResult completionHandler)
        // Perform your background fetch here


but I get this error:

/Users/jassim/Projects/MyApp/MyApp/Platforms/iOS/AppDelegate.cs(35,35): Error CS0115: 'AppDelegate.PerformFetch(UIApplication, UIBackgroundFetchResult)': no suitable method found to override (CS0115) (MyApp)

Kindly help..


A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
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  1. Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 29,381 Reputation points Microsoft Vendor


    This is a known issue reported at GitHub. Please see iOS AppDelegate - PerformFetch override #1419 and iOS AppDelegate - Override for PerformFetch is not available #7957

    And it was fixed the in .Net8.0.0-preview.3.8149.

    For the usage of App lifecycle, you could refer to App lifecycle - .NET MAUI | Microsoft Learn.

    Best Regards,

    Wenyan Zhang

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