How do I initialize an ILogger in a .NET 6 class library?

May 25, 2022

I’ve a class library, which is used by a console application. I now want to add a ILogger<T> via constructor injection in my class library. I came up with something like this:

public class Class1
{
    private readonly ILogger<Class1> _logger;

    public Class1(ILogger<Class1> logger)
    {
        _logger = logger;
    }
}

Nevertheless I don’t know how I could hand over the ILogger<T>.

public class Program
{
    public static void Main(string[] args)
    {
        Class1 clazz = new Class1(?????);
    }
}

>Solution :

We can try to use ServiceCollection which can be restored from Microsoft.Extensions.DependencyInjection

ServiceCollection can register Class1 class to DI Container and ILogger<Class1> might auto injected if we register our class correctly.

var services = new ServiceCollection();
services.AddLogging(configure => configure.AddConsole());
services.AddTransient<Class1>();
ServiceProvider serviceProvider = services.BuildServiceProvider();
Class1 clazz = serviceProvider.GetRequiredService<Class1>();

I would suggest using Microsoft.Extensions.Logging to implement our log mechanism which provides infrastructure default implementation by Microsoft.

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