1. 引入log4net、Microsoft.Extensions.Logging.Log4Net.AspNetCore包
2. 添加log4net配置文件
3. 在Program中添加如下代码：
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureLogging((context, logger) =>
{
logger.ClearProviders();
logger.AddLog4Net(new Log4NetProviderOptions()
{
Log4NetConfigFileName = "Config/log4net.xml",
Watch = true
});
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
4. 在需要记录日志的类中通过构造函数引入：
public class ActionExceptionHandlerAttribute : Attribute, IActionFilter
{
private readonly ILogger<ActionExceptionHandlerAttribute> _logger;
public ActionExceptionHandlerAttribute(ILogger<ActionExceptionHandlerAttribute> logger)
{
_logger = logger;
}
}
asp.net core 3.0在Microsoft.Extensions.Logging中添加log4net支持
原文：https://www.cnblogs.com/chikychan/p/12045176.html