Use logging to track errors and debug issues. Logging is an essential part of any software development process. It allows developers to track errors and debug issues in their applications. .NET Core provides a built-in logging framework that makes it easy to add logging to your application. By default, .NET Core logs to the console, but you can configure it to log to other destinations such as a file or a database.

Logging is useful for several reasons. First, it helps developers identify and fix errors in their applications. When an error occurs, developers can look at the log files to see what happened and where the error occurred. This can save a lot of time compared to trying to reproduce the error manually. Second, logging can help developers understand how their application is behaving in production. By looking at the log files, developers can see how often certain features are being used, how long certain operations are taking, and other useful information. This can help developers optimize their application and improve its performance. Finally, logging can help developers comply with regulatory requirements. Many industries have regulations that require applications to log certain events, such as user logins or financial transactions. By using a logging framework, developers can easily meet these requirements.

using Microsoft.Extensions.Logging;

public class MyClass
{
    private readonly ILogger _logger;

    public MyClass(ILogger logger)
    {
        _logger = logger;
    }

    public void DoSomething()
    {
        _logger.LogInformation("Doing something...");
        try
        {
            // Some code that might throw an exception
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "An error occurred while doing something.");
        }
    }
}

In the above example, we are using the built-in logging framework in .NET Core. We are injecting an instance of ILogger into our class and using it to log information and errors. In the DoSomething method, we are logging some information before executing some code that might throw an exception. If an exception is thrown, we catch it and log an error message along with the exception. This will allow us to track errors and debug issues in our application.