“Don’t forget to flush” .Net Core Application Insights

This post updates a previous post “Don’t forget to flush Application insights Revisited” for .Net Core 3.X and shows the small change required by the deprecation of on of the TelemetryClient constructor overloads.

warning CS0618: ‘TelemetryClient.TelemetryClient()’ is obsolete: ‘We do not recommend using TelemetryConfiguration.Active on .NET Core. See https://github.com/microsoft/ApplicationInsights-dotnet/issues/1152 for more details’

   class Program
      static void Main(string[] args)
         if (args.Length != 1)
            Console.WriteLine("Usage AzureApplicationInsightsClientConsole <instrumentationKey>");

         TelemetryConfiguration telemetryConfiguration = new TelemetryConfiguration(args[0]);
         TelemetryClient telemetryClient = new TelemetryClient(telemetryConfiguration);
         telemetryClient.TrackTrace("INSTRUMENTATION_KEY_TELEMETRY_CONFIGURATION", SeverityLevel.Information);
         TelemetryConfiguration telemetryConfiguration = TelemetryConfiguration.CreateDefault();
         TelemetryClient telemetryClient = new TelemetryClient(telemetryConfiguration);
         telemetryClient.TrackTrace("INSTRUMENTATION_KEY_APPLICATION_INSIGHTS_CONFIG", SeverityLevel.Information);
         telemetryClient.Context.User.Id = Environment.UserName;
         telemetryClient.Context.Device.Id = Environment.MachineName;
         telemetryClient.Context.Operation.Name = "Test harness";

         telemetryClient.TrackTrace("This is a .Net Core AI API Verbose message", SeverityLevel.Verbose);
         telemetryClient.TrackTrace("This is a .Net Core AI API Information message", SeverityLevel.Information);
         telemetryClient.TrackTrace("This is a .Net Core AI API Warning message", SeverityLevel.Warning);
         telemetryClient.TrackTrace("This is a .Net Core AI API Error message", SeverityLevel.Error);
         telemetryClient.TrackTrace("This is a .Net Core AI API Critical message", SeverityLevel.Critical);


         telemetryConfiguration.Dispose(); // In real-world use a using or similar approach to ensure cleaned up

         Console.WriteLine("Press <enter> to exit");

A sample project is available here

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