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The new way to handle error logging in Umbraco 9

Umbraco.Core.Logging has been replaced in Umbraco 9

With Umbraco 9 there is now no longer Umbraco.Core.Logging. This has been replaced and Umbraco is now using the standard Microsoft logging in .Net Core. The concept and most of the code structure is very similar but just a few subtle differences.

How to inject the logger to your controllers, helpers, and services

You can inject the logger in a very similar way to like you could do with Umbraco 8. The main difference is that you wont be injecting the logger from the Umbraco.Core.Logging namespace but instead from Microsoft.Extensions.Logging namespace.

The first think you need to do is add a using statement at the top of your controller or wherever you want to inject the logger.

using Microsoft.Extensions.Logging;

To inject the logger to your controller it can be done like this.

private readonly ILogger<HomePageController> _logger;
public HomePageController(ILogger<HomePageController> logger, ICompositeViewEngine compositeViewEngine, IUmbracoContextAccessor umbracoContextAccessor) : base(logger, compositeViewEngine, umbracoContextAccessor)
     _logger = logger;

Then to call the logger you can see a demonstration in the following code. I have added both an error log and faked throwing an error. below that I have also demonstrated how to log information to the error log.

public override IActionResult Index()
          throw new Exception();
      catch(Exception e)
           _logger.LogError(e, "Index | Exception: {0} | Message: {1} | Stack Trace: {2}", e.InnerException != null ? e.InnerException.ToString() : "", e.Message != null ? e.Message.ToString() : "", e.StackTrace);
     _logger.LogInformation("Some infortative message here");

     var vm = new HomePageViewModel(CurrentPage) { };
     return View("/Views/homePage.cshtml", vm);

If you are wondering where the error logs are now stored you will find them in the /umbraco/Logs folder.

The error logs can also still be views in Umbraco backend as shown in the screenshot.

Umbraco 9 Error Logging

To summerise Umbraco 9 error logging is very much the same apart from a couple of differences. The main one to take away is the fact we should now we using Microsoft.Extensions.Logging namespace.


* I just want to add one final note here since its an issue I got tripped up on. If your are like me and inject the ILogger into your controllers and custom services the please remember to inject it in the new way. If you compare this to Umbraco 8 you will notice the signature is slightly different.

private readonly ILogger<SiteHelper> _logger;
public SiteHelper(ILogger<SiteHelper> logger)
     _logger = logger;



About the author

David Armitage

.Net MVC Developer
.Net Core Developer
Umbraco Certified Master
Recruitment Professional

Hey Peeps,

I'm an entrepreneur and web developer with a passion for coding. I absolutely love working with Umbraco CMS and appreciate the Umbraco community even more.

I've got 10 years+ .Net experience and 7 years+ experience working in the recruitment industry, both coding and marketing job websites. I wanted to use my skills to help give something back to this awesome community and so I decided to build

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I want this website to be a place where Umbraco Professionals and Umbraco Partners can advertise their services but at the same time I want to filter out all the under-qualified freelancers & agencies that take up the biggest part of other job & freelancer websites. We've all worked hard to gain our Umbraco certifications, partnership status, and help build the Umbraco community to what it is today. I want to see everyone get rewarded for their efforts.

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