Скачать или смотреть Solving the ILogger Logging Issue in Async Methods: Why You Can't See Your Logs

Struggling with ILogger not logging in async methods while Console.WriteLine works? Learn why this happens and how to fix it!
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This video is based on the question https://stackoverflow.com/q/70929402/ asked by the user 'Mike van der Velde' ( https://stackoverflow.com/u/15895452/ ) and on the answer https://stackoverflow.com/a/70929641/ provided by the user 'Abdelkrim' ( https://stackoverflow.com/u/8929299/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the ILogger Issue in Async Methods

If you’ve ever worked with C- and ASP.NET, you might have encountered an interesting issue where using ILogger for logging in an async method doesn’t seem to work while Console.WriteLine does. This can be quite puzzling, especially when you see the log output for other operations and then notice that some parts of your code are failing silently.

In this guide, we'll dive deep into why you might not see logs from ILogger in an async context, specifically focusing on the potential causes and solutions to this dilemma.

The Problem

Consider the following code excerpt:

[[See Video to Reveal this Text or Code Snippet]]

When you run this code, you observe the following outputs:

The ILogger outputs "Init" during initialization.

The Console outputs "Mainloop1".

However, "Mainloop2" from ILogger doesn't show up at all.

This leads us to the question: Why does this happen?

Understanding the Cause

The issue likely stems from the log level configuration associated with your ILogger instance. Here are the primary points to consider:

Different Log Levels: The method LogDebug is used for logging black box debugging information. If your logging configuration is set to a higher log level (for instance, Information), then debug-level logs won’t be displayed by default. This is a common oversight.

Configuration Files: If you haven’t adjusted the logging settings, the default log level might prevent LogDebug messages from being displayed. The logging configuration would typically be found in the appsettings.json file.

Solution: Ensuring Your Logs Appear

To resolve the logging issues with ILogger, follow these organized steps:

Step 1: Change Log Level

If you suspect that the issue is with the log level, consider switching from LogDebug to LogInformation. This could allow the log message to appear since LogInformation is generally displayed at lower verbosity levels. Update your code like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Check Logging Configuration

Inspect your appsettings.json to review the logging levels that have been set. It might look something like this:

[[See Video to Reveal this Text or Code Snippet]]

Ensure it allows Debug level logs if you wish to see them, or change your logging calls appropriately.

Step 3: Test the Changes

After making the changes, run your application again. You should now see "Mainloop2" from ILogger if your configuration allows it and you've appropriately changed the method call.

Conclusion

Debugging issues with logging in async methods can be tricky, but by focusing on log levels and configuration settings, you can resolve visibility problems with your logs. With these insights, you should be able to diagnose similar issues in your projects and ensure you're getting the feedback needed from your logs.

Implement these troubleshooting steps, and watch your logging capabilities flourish even in asynchronous contexts!