How to get an ILogger instance without Dependency Injection in Program.cs during Startup.

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Aryan Kumar · Answer

In some cases, you may want to obtain an ILogger instance without using dependency injection, such as in the Program.cs file during startup. You can do this by creating a logger manually using the LoggerFactory class. Here's how to obtain an ILogger instance without dependency injection in the Program.cs file:

Add the Required Using Statements:

At the top of your Program.cs file, make sure you have the necessary using statements to access the required classes:

using Microsoft.Extensions.Logging;

Create an ILogger Instance:

In the Main method of your Program.cs file, you can create an ILogger instance manually using the LoggerFactory class:

public class Program
{
    public static void Main(string[] args)
    {
        var loggerFactory = LoggerFactory.Create(builder =>
        {
            builder.AddConsole(); // You can choose a different logging provider if needed
        });

        var logger = loggerFactory.CreateLogger<Program>();

        // Use the logger as needed
        logger.LogInformation("Application is starting.");

        CreateHostBuilder(args).Build().Run();
    }

In the code above:

We create a LoggerFactory instance and configure it with a logging provider using the AddConsole method. You can choose a different logging provider like AddDebug or AddFile depending on your requirements.
We create an ILogger instance specific to the Program class using loggerFactory.CreateLogger<Program>().
You can use the logger to log messages as needed.

This approach allows you to create and use an ILogger instance in the Program.cs file without relying on dependency injection. You can customize the logger configuration and logging provider to suit your application's needs.

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How to get an ILogger instance without Dependency Injection in Program.cs during Startup.

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