Simplify continuous webjob by using background service

AppInsightsWithWebJob/ContinuousJob.cs

@@ -6,7 +6,7 @@
 
 namespace AppInsightsWithWebJob
 {
-    public class ContinuousJob : IHostedService
+    public class ContinuousJob : BackgroundService
     {
         private readonly ILogger<ContinuousJob> logger;
 
@@ -15,13 +15,13 @@ public ContinuousJob(ILogger<ContinuousJob> logger)
             this.logger = logger;
         }
 
-        public async Task StartAsync(CancellationToken cancellationToken)
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
         {
             var counter = 0;
-            while (!cancellationToken.IsCancellationRequested)
+            while (!stoppingToken.IsCancellationRequested)
             {
                 Console.Write(".");
-                await Task.Delay(100, cancellationToken);
+                await Task.Delay(100, stoppingToken);
 
                 if (counter++ > 20)
                 {
@@ -30,10 +30,5 @@ public async Task StartAsync(CancellationToken cancellationToken)
                 }
             }
         }
-
-        public Task StopAsync(CancellationToken cancellationToken)
-        {
-            return Task.CompletedTask;
-        }
     }
 }

AppInsightsWithWebJob/Program.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Microsoft.ApplicationInsights.Extensibility;
 using Microsoft.Azure.WebJobs;
 using Microsoft.Extensions.DependencyInjection;
@@ -8,6 +7,10 @@
 
 namespace AppInsightsWithWebJob
 {
+    using System;
+    using System.Threading;
+    using Microsoft.ApplicationInsights;
+
     class Program
     {
         static async Task Main(string[] args)
@@ -35,16 +38,16 @@ static async Task Main(string[] args)
             });
 
             var host = builder.Build();
-            var cancellationToken = new WebJobsShutdownWatcher().Token;
 
             var telemetryClient = host.Services.GetService<TelemetryClient>();
-            AppDomain.CurrentDomain.UnhandledException += (sender, eventArgs) => telemetryClient.TrackException((Exception)eventArgs.ExceptionObject);
-            TaskScheduler.UnobservedTaskException += (sender, eventArgs) => telemetryClient.TrackException((Exception)eventArgs.Exception);
 
-            using (cancellationToken.Register(() => host.Services.GetService<IJobHost>().StopAsync().GetAwaiter().GetResult()))
-            using (host)
+            try
+            {
+                await host.RunAsync();
+            }
+            catch (Exception exception)
             {
-                await host.RunAsync(cancellationToken);
+                telemetryClient.TrackException(exception);
             }
         }
     }