Add method to existing Microsoft.Extensions.Logging.LoggerExtensions in Core 2.1

Question

I want to add a method to the existing LoggerExtensions on Core 2.1 that will need to use IConfiguration to read some settings from the appsettings.json file.

I created a partial static class with my new method inside it but this does not allow me to access the IConfiguration as it is a static class.

How could I create this new method that is part of LoggerExtensions that can read from IConfiguration?

In the example below I can't access _configuration.GetSection as I can not inject it

public static partial class LoggerExtensions { public static void EmailError(this ILogger logger, Exception exception, string message) { using (var smtpClient = new SmtpClient(config.GetSection("Host").Value)) { // ...... } } }

Add some code that what you have tried so far!

TanvirArjel
– TanvirArjel

2019-01-08 15:31:09 +00:00
Commented Jan 8, 2019 at 15:31 — TanvirArjel
– TanvirArjel, Commented Jan 8, 2019 at 15:31

Henk Mollema · Accepted Answer · 2019-01-08 15:43:45Z

You should add the IConfiguration instance as a parameter to the extension method. For example:

public static void LogErrorAndEmail(this ILogger logger, IConfiguration configuration, Exception exception, string message, params object[] args) { // ... }

A better option might be to create a custom logger implementation which sends a mail under specific conditions. You can start by implementing the ILogger interface and implement your mail logic in the Log method. Inject the IConfiguration instance in the constructor. Secondly create a ILoggerFactory implementation to create a new instance of your custom logger, inject the IConfigruation parameter in the constructor as well and pass it to your logger. Finally call services.AddSingleton<ILoggerProvider, YourCustomLoggerProvider>() in the startup class to register your custom logger.

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