Logs Not Visible in Application Insights for .NET Framework 4.6.1 Console App

Question

Hi,

I have a console app in .NET Framework 4.6.1 and I am trying to add Application Insights logging, but the logs are not visible in Application Insights. What am I doing wrong?

My code:

public class Program
{
    private static readonly ILoggerFactory loggerFactory = LoggerFactory.Create(builder =>
    {
        builder.AddConsole();
        builder.AddApplicationInsights("instrumentationKey");     });

    private static readonly ILogger<Program> logger = loggerFactory.CreateLogger<Program>();
    private static readonly ILogger<Patient> patientLogger = loggerFactory.CreateLogger<Patient>();

    public static void Main(string[] args)
    {
        logger.LogInformation("Test Main");
        Program p = new Program();
        p.OnStart();
    }

    protected void OnStart()
    {
        CallService();
    }

    public void CallService()
    {
        try
        {
            Patient patient = new Patient(patientLogger);
            patient.Check();

        }
        catch (Exception ex)
        {
            logger.LogError(ex, "An error occurred while calling the service.");
        }
    }
}

public class Patient
{
    private readonly ILogger<Patient> _logger;

    public Patient(ILogger<Patient> logger)
    {
        _logger = logger;
    }

    public void Check()
    {
        _logger.LogInformation("Checking patient...");

    }
}

Answer 1

Hi Sonal . Welcome to MS Q&A

To add Application Insights logging to console applications, first install the following NuGet packages:

• Microsoft.Extensions.Logging.ApplicationInsights
• Microsoft.Extensions.DependencyInjection

The following example uses the Microsoft.Extensions.Logging.ApplicationInsights package and demonstrates the default behavior for a console application. The Microsoft.Extensions.Logging.ApplicationInsights package should be used in a console application or whenever you want a bare minimum implementation of Application Insights without the full feature set such as metrics, distributed tracing, sampling, and telemetry initializers.

using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.Extensibility;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.ApplicationInsights;
using System;
using System.Threading.Tasks;

namespace ConsoleApp
{
    class Program
    {
        static async Task Main(string[] args)
        {
            using var channel = new InMemoryChannel();

            try
            {
                IServiceCollection services = new ServiceCollection();
                services.Configure<TelemetryConfiguration>(config => config.TelemetryChannel = channel);
                services.AddLogging(builder =>
                {
                    // Only Application Insights is registered as a logger provider
                    builder.AddApplicationInsights(
                        configureTelemetryConfiguration: (config) => config.ConnectionString = "<YourConnectionString>",
                        configureApplicationInsightsLoggerOptions: (options) => { }
                    );
                });

                IServiceProvider serviceProvider = services.BuildServiceProvider();
                ILogger<Program> logger = serviceProvider.GetRequiredService<ILogger<Program>>();

                logger.LogInformation("Logger is working...");
            }
            finally
            {
                // Explicitly call Flush() followed by Delay, as required in console apps.
                // This ensures that even if the application terminates, telemetry is sent to the back end.
                channel.Flush();

                await Task.Delay(TimeSpan.FromMilliseconds(1000));
            }
        }
    }
}

Please check this doc which include step by step process -->https://learn.microsoft.com/en-us/azure/azure-monitor/app/ilogger?tabs=dotnet5

Kindly accept answer if it helps , please let me know if any questions

Thanks

Deepanshu