Exception logging in .NET Core APIs is pretty straight forward. I recently started working on a new API at my company and rolled mine like this.
First of all, I am a big fan of using extension methods in my configuration to make things neat. Therefore, on my Startup.Configure() method, I created one that in this example I am calling UseCesarCodesExceptionHandling. This is an extension method on a tuple of (IApplicationBuilder, ILogger) and it takes a parameter of isDevelopment. You could make this much simpler, but this works for me. The point is that I have an extension method on my configuration.
Inside of the extension method, I utilize IApplicationBuilder.UseExceptionHandler, which adds a middleware that basically catches all of your unhandled exceptions.
As you can see, I have a class called ExceptionLog that serves as a standardized logging unit for all my exceptions. I then utilize an extension method named ToExceptionLogJson() for uniformed serialization.
And finally, for other exceptions I handle myself, I can utilize custom extension methods that piggy back on this. In the following example, I have a FlurlHttpException that leverages this logic.
And there it is. Happy coding!
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