.net 6中使用log4net必须添加log4net、Microsoft.Extensions.Logging.Log4Net.AspNetCore两个引用。

使用之前必须在项目中添加log4net的配置文件Log4Net.Config，代码如下：

然后在Program.cs文件中进行注册，注册代码如下：

注册完成后在程序里面就可以使用了，使用方法如下：

public class FirstController : Controller
    {
        private readonly ILogger<FirstController> _Logger;
        private readonly ILoggerFactory _LoggerFactory;
        public FirstController(ILogger<FirstController> logger,ILoggerFactory loggerFactory) {
            this._Logger = logger;
            this._Logger.LogInformation($"{this.GetType().Name}被构造了log1");
            this._LoggerFactory = loggerFactory;
            ILogger<FirstController> _Logger2 =
            this._LoggerFactory.CreateLogger<FirstController>();
            _Logger2.LogInformation($"{this.GetType().Name}被构造了log2");
        }
        public IActionResult Index()
        {
            ILogger<FirstController> _Logger3 =
            this._LoggerFactory.CreateLogger<FirstController>();
            _Logger3.LogInformation($"index被执行了");
 
            this._Logger.LogInformation($"index被执行了");
            return View();
        }
    }