How do I log from other classes than the controller in ASP.NET Core?

Question

ASP.NET Core has built-in support for logging, but the documentation states that logging should be done by requesting an ILogger via dependency injection, i.e. by a

Answer 1

This article indicates that you should use DI to inject your logger in all classes that need it: https://docs.asp.net/en/latest/fundamentals/logging.html

"This technique is not limited to controllers, but can be utilized by any of your application services that utilize Dependency Injection."

On the other hand, here is an article (Microsoft sponsored) that mentions a global static reference approach: https://msdn.microsoft.com/en-us/magazine/mt694089.aspx?f=255&MSPPError=-2147217396

"As you may notice, this requires access to the same logger factory instance on which the providers were previously configured. And while it’s conceivable you could pass the logger factory instance into every class from which you want to perform logging, it would quickly become a hassle that would beg for refactoring.

The solution is to save a single static ILoggerFactory as a static property that’s available for all classes when instantiating their object’s specific ILoggger instance. For example, consider adding an ApplicationLogging static class that includes a static ILoggerFactory instance:"

Not trying to stoke the Static vs. DI vs. Service Locator: Pattern or Anti-pattern debates, I personally find common cross-cutting concerns such as logging and configuration to be candidates for this latter approach, but have used both in the past.