Injecting ILogger<T> in Azure Functions throws an Exception

In an Azure Function, an instance of ILogger is injected in the functions themselves. But I would like to inject an instance of ILogger / ILogger<T> / ILoggerFactory in my components registered with SimpleInjector. Doing so results in the following exception:

System.Private.CoreLib: Exception while executing function: TestGenericLogger. SimpleInjector: The registered delegate for type ILogger<GenericSpeaker> threw an exception. Unable to resolve service for type ‘Microsoft.Azure.WebJobs.Script.IFileLoggingStatusManager’ while attempting to activate ‘Microsoft.Azure.WebJobs.Script.Diagnostics.HostFileLoggerProvider’. Microsoft.Extensions.DependencyInjection: Unable to resolve service for type ‘Microsoft.Azure.WebJobs.Script.IFileLoggingStatusManager’ while attempting to activate ‘Microsoft.Azure.WebJobs.Script.Diagnostics.HostFileLoggerProvider’.

The full example can be found on this repo: https://github.com/ahocquet/simple-injectore-af-logging

Here’s a sample of my code:

[FunctionName("TestGenericLogger")]
public static IActionResult TestGenericLogger(
	[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]
	HttpRequest req,
	ILogger log)
{
	DIConfig.Container.GetInstance<GenericSpeaker>().SayHello();

	return new OkResult();
}

The registration process looks like this:

public static class DIConfig
{
	public static readonly Container Container = new Container();

	public static void Init(IServiceCollection serviceCollection)
	{
		serviceCollection.AddSimpleInjector(Container);

		Container.Register<Speaker>();
		Container.Register<GenericSpeaker>();
		Container.Register<FactorySpeaker>();

		serviceCollection.BuildServiceProvider()
						 .UseSimpleInjector(Container);
	}
}

The dependency injection using IServiceCollection works great for ILogger<T> and ILoggerFactory. Therefore, there must be a way to crosswire the ILoggerFactory / ILogger<T>.

I could apply a composition root pattern and use an entry point in all my functions that will set the ILogger instance within a LoggingWrapper service. That would work, but that would let me unsatisfied. 🤔

[dotnetjunkie]

Simple Injector is not able to inject dependencies into Azure functions and I advise not using method injection at all. We have other Azure-related questions on this forum that discuss this as well. Take a look.

[dotnetjunkie]

I created a new Azure Functions Integration page. This demonstrates how to integrate Simple Injector with Azure Functions v3.