Hands-On Full-Stack Web Development with ASP.NET Core

Writing a log message from the controller

The logging infrastructure is already registered in the built-in dependency injection container, so all you need to do to get access to the logger is to add it as a parameter in your controller constructor so that it will be injected when the controller is created. For example, this is how the logger is injected into the GiveNTake ProductsController:

using Microsoft.Extensions.Logging;[Authorize][Route("api/[controller]")]public class ProductsController : Controller{    ...       private readonly ILogger<ProductsController> _logger;     public ProductsController(GiveNTakeContext context, ILogger<ProductsController> logger)    {        _logger = logger;        ...    }    ...}

Whenever you need to write a log event, you need to use ...