SystemExtensions/SystemExtensions.NetStandard.DependencyInjection/Logging/LoggerResolver.cs

using Microsoft.Extensions.Logging;
using Slim.Resolvers;
using System.Linq;

namespace System.Logging;

public sealed class LoggerResolver : IDependencyResolver
{
    public bool CanResolve(Type type)
    {
        if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(ILogger<>) ||
            type == typeof(ILogger))
        {
            return true;
        }

        return false;
    }

    public object Resolve(Slim.IServiceProvider serviceProvider, Type type)
    {
        if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(ILogger<>))
        {
            return ResolveScopedLogger(serviceProvider, type);
        }
        else if (type == typeof(ILogger))
        {
            return ResolveLogger(serviceProvider);
        }
        else
        {
            throw new InvalidOperationException($"{nameof(LoggerResolver)} cannot resolve an object of type {type.Name}");
        }
    }

    private static object ResolveScopedLogger(Slim.IServiceProvider serviceProvider, Type type)
    {
        var loggerFactory = serviceProvider.GetService<ILoggerFactory>();
        var categoryTypes = type.GetGenericArguments();
        var createLoggerMethod = typeof(LoggerFactoryExtensions).GetMethods().Where(m => m.IsGenericMethodDefinition && m.Name == nameof(LoggerFactoryExtensions.CreateLogger)).First();
        return createLoggerMethod.MakeGenericMethod(categoryTypes.First()).Invoke(null, new object[] { loggerFactory });
    }

    private static object ResolveLogger(Slim.IServiceProvider serviceProvider)
    {
        var loggerFactory = serviceProvider.GetService<ILoggerFactory>();
        return loggerFactory.CreateLogger(string.Empty);
    }
}