ASP.NET Core 6.0 使用 Log4Net 和 Nlog日志中间件

在ASP.NET Core 6.0中，您可以通过以下步骤使用Log4Net和NLog作为日志中间件：

1. 安装NuGet包

   对于Log4Net，安装log4net包：

   
   
   
   dotnet add package log4net

   对于NLog，安装NLog.Web.AspNetCore包：

   
   
   
   dotnet add package NLog.Web.AspNetCore

2. 配置Log4Net或NLog

   在appsettings.json中配置Log4Net或NLog的设置。

3. 配置服务

   在Program.cs或Startup.cs中配置Log4Net或NLog服务。

以下是使用Log4Net和NLog的示例代码片段：

Program.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using log4net.Config;
using NLog.Web;
 
public class Program
{
    public static void Main(string[] args)
    {
        // Configure Log4Net
        XmlConfigurator.Configure();
        LogManager.GetRepository();
 
        // Configure NLog
        NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();
 
        CreateHostBuilder(args).Build().Run();
    }
 
    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            })
            .ConfigureLogging(logging =>
            {
                logging.ClearProviders(); // Remove default logging providers
                // Optionally add other log providers
            });
}

Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using log4net;
 
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Add Log4Net
        services.AddSingleton<ILog>(LogManager.GetLogger(typeof(Startup)));
 
        // Add NLog
        services.AddNLogWeb();
 
        // Add other services
    }
 
    public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
    {
        // Configure Log4Net logger
        var log4NetLogger = LogManager.GetLogger(typeof(Startup));
        loggerFactory.AddLog4Net(log4NetLogger);
 
        // Configure NLog logger
        loggerFactory.AddNLog();
 
        // Configure the rest of the application
        app.UseRouting();
 
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapGet("/", async context =>
            {
                // Log a message
                var nlogLogger = context.RequestServices.GetService<ILogger<Startup>>();
                n