How can I use the new DI to inject an ILogger into an Azure Function using IWebJobsStartup?

Question

I am using Azure Function v2. Here is my function that uses the constructor injection:

public sealed class FindAccountFunction
{
    private readonl         


        

Answer 1

You should remove the call of AddLogging method from your startup class. The default logger is already setup by the azure function host.

[assembly: WebJobsStartup(typeof(StartUp))]
public class StartUp : IWebJobsStartup
{
    public void Configure(IWebJobsBuilder builder)
    {
        builder.Services.AddSingleton();

        builder.Services.AddTransient();
    }
}

public MyFunction(IMyService service, ILogger logger)
{
    this.service = service;
    this.logger = logger;
}

Instance methods are now supported with azure function since Azure Functions Runtime 2.0.12265