Example on how to wire up durable function dependency injection - function

Question

Having successfully created and run a simple Azure Durable Function in Visual Studio 2017, I want to introduce logging.
The Visual Studio project template generates the static HttpStart class with a
Run method containing an optional parameter of type Microsoft.Extensions.Logging.ILogger.
I have no idea how to hook up dependency injection into a durable function project. Can anyone point me to an example on how to achieve this?
It looks to me like I will need some class, inside which I will need to use the Microsoft.Extensions.Logging.LoggingFactory.CreateLogger() method.
I imagine that this logic will need to be within a container class that is hooked into the run time pipeline using HostBuilder in some way (similar to using WebHostBuilder in static main method).
Thank you

Answer 1

#Thomas pointed me to examples I used to extract code that allows dependency injection to work when writing a durable function project:
using System.IO;
using System.Reflection;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using NLog;
using NLog.Extensions.Logging;
using tmetadastoreFnApp;
using Willezone.Azure.WebJobs.Extensions.DependencyInjection;
using ILogger = Microsoft.Extensions.Logging.ILogger;
using LogLevel = Microsoft.Extensions.Logging.LogLevel;
[assembly: WebJobsStartup(typeof(Startup))]
namespace tmetadastoreFnApp
{
internal class Startup : IWebJobsStartup
{
public void Configure(IWebJobsBuilder builder) =>
builder.AddDependencyInjection(ConfigureServices);
private void ConfigureServices(IServiceCollection services)
{
services.AddSingleton<ILoggerFactory, LoggerFactory>();
services.AddSingleton(typeof(ILogger<>), typeof(Logger<>));
services.AddLogging((builder) => builder.SetMinimumLevel(LogLevel.Trace));
var serviceProvider = services.BuildServiceProvider();
var loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();
loggerFactory.AddNLog(new NLogProviderOptions { CaptureMessageTemplates = true, CaptureMessageProperties = true });
var dir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
LogManager.LoadConfiguration(Directory.GetParent(dir) + "\\nlog.config");
}
}
}