netCore中的内置日志的使用

1、net Core 3.1 中配置   

参考链接： https://learn.microsoft.com/zh-cn/aspnet/core/fundamentals/logging/?view=aspnetcore-3.1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace GDC.OfficeCloud.WebPC
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureLogging(logging => {
                    logging.ClearProviders(); //主要是配置这里
                    logging.AddConsole(); //主要是配置这里
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.ConfigureKestrel((context, options) =>
                    {
                        //设置应用服务器Kestrel请求体最大为500MB
                        options.Limits.MaxRequestBodySize = 524288000;
                    });
                    webBuilder.UseStartup<Startup>();
                });
    }
}

使用：

public class GDCActionFilter : IActionFilter
  {
      private readonly ILogger _logger;
      private IHostingEnvironment _environment;

      public GDCActionFilter(ILogger<GDCActionFilter> logger,IHostingEnvironment environment)
      {
          _logger = logger;
          _environment= environment;
      }

      public void OnActionExecuting(ActionExecutingContext context)
      {
          _logger.LogInformation("Request: {0} {1}", context.HttpContext.Request.Method, context.HttpContext.Request.Path);//只截取了部分代码

　　　　　　_logger.LogInformation("Request Body: {0}", context.HttpContext.Request.Body); //只截取了部分代码

查看日志：

 这是在 Visual Studio调试中看到的，暂时没想到如何配置记录在 txt文件中

2、net 6.0以上的版本

参考：https://learn.microsoft.com/zh-cn/aspnet/core/fundamentals/logging/?view=aspnetcore-6.0

var builder = WebApplication.CreateBuilder(args);
builder.Logging.ClearProviders();  //核心代码
builder.Logging.AddConsole(); //核心代码

builder.Services.AddRazorPages();

var app = builder.Build();

if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();

或者如下方式配置：

var builder = WebApplication.CreateBuilder();
builder.Host.ConfigureLogging(logging =>
{
    logging.ClearProviders();
    logging.AddConsole();
});

使用：

public class AboutModel : PageModel
{
    private readonly ILogger _logger;

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

    public void OnGet()
    {
        _logger.LogInformation("About page visited at {DT}", 
            DateTime.UtcNow.ToLongTimeString());
    }
}

暂时没想到如何配置内置的日志到txt中。如果要实现记录到 txt中，可以使用第三方的 Nlog将日志输出到文件