怎么在.Net Core3.0/ 3.1Webapi 中使用Log4net 写日志 及读取配置文件的信息

1:安装Log4Net的 NuGet 包:

 我们通常之需要安装这一个包即可,其他的主包会自动被添加进来:

insatll-package  Microsoft.Extensions.Logging.Log4Net.AspNetCore 3.0.0 (如果不行就直接NuGet可视化安装)!

2:Log4Net的配置文件的内容:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <!-- Define some output appenders -->
  <appender name="rollingAppender" type="log4net.Appender.RollingFileAppender">
    <file value="Errorlog\\log.txt" />
 
    <!--追加日志内容-->
    <appendToFile value="true" />
 
    <!--防止多线程时不能写Log,官方说线程非安全-->
    <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
 
    <!--可以为:Once|Size|Date|Composite-->
    <!--Composite为Size和Date的组合-->
    <rollingStyle value="Composite" />
 
    <!--当备份文件时,为文件名加的后缀,这里可以作为每一天的日志分别存储不同的文件-->
    <datePattern value="yyyyMMdd".txt"" />
    <StaticLogFileName value="false"/>
 
    <!--日志最大个数,都是最新的-->
    <!--rollingStyle节点为Size时,只能有value个日志-->
    <!--rollingStyle节点为Composite时,每天有value个日志-->
    <maxSizeRollBackups value="20" />
 
    <!--可用的单位:KB|MB|GB-->
    <maximumFileSize value="3MB" />
 
    <!--置为true,当前最新日志文件名永远为file节中的名字-->
    <staticLogFileName value="true" />
 
    <!--输出级别在INFO和ERROR之间的日志-->
    <filter type="log4net.Filter.LevelRangeFilter">
      <param name="LevelMin" value="DEBUG" />
      <param name="LevelMax" value="FATAL" />
    </filter>
 
    <layout type="log4net.Layout.PatternLayout">
      <!--日志输出格式:时间  日志类型  日志内容-->
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
    </layout>
  </appender>
 
  <!-- levels: OFF > FATAL > ERROR > WARN > INFO > DEBUG  > ALL -->
  <root>
    <priority value="ALL"/>
    <level value="ALL"/>
    <appender-ref ref="rollingAppender" />
  </root>
</log4net><br><br><br>

  

3:在StartUp类中新增读取Log4Net的配置文件的代码如下:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using WebApp.Filters;
 
namespace WebApp
{
    using log4net;
    using log4net.Config;
    using log4net.Repository;
    public class Startup
    {
        public static ILoggerRepository repository { get; set; }
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
            repository = LogManager.CreateRepository("rollingAppender");
            XmlConfigurator.Configure(repository, new System.IO.FileInfo(System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.config")));
           
        }
 
        public IConfiguration Configuration { get; }
 
        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews();//configure =>        
            //-------全局异常过滤器
            services.AddMvc(c => c.Filters.Add<CustomerExceptionFilterAttribute>());
        }
 
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }
            app.UseStaticFiles();
 
            app.UseRouting();
 
            app.UseAuthorization();
 
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Student}/{action=Index}/{id?}");
            });
        }
    }
}

  

 4:Log4Net的文件修改为始终复制:

 

 

 

 

5:我们在Controller来简单的测试一下,代码如下:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApp.Filters;
 
namespace WebApp.Controllers
{
    using log4net;
    using Microsoft.Extensions.Configuration;
    public class StudentController : Controller
    {
        private ILog log = LogManager.GetLogger(Startup.repository.Name,typeof(StudentController));
 
        private IConfiguration config;
        public StudentController(IConfiguration config)
        {
            this.config = config;
        }
 
        [TypeFilter(typeof(CustomerActionFilterAttribute))]
        [TypeFilter(typeof(CustomerExceptionFilterAttribute))]
        [TypeFilter(typeof(CustomerResourceFilterAttribute))]
        public IActionResult Index()
        {
            string uid = config["mysqlserver:database"];
            string infoName = config["mysqlserver:infos:1:age"];
            log.Info("dsadsadsdsdsaderror");
            log.Error("errorddddddddd");
 
            int j = 0;
            //    int i = 0 / j;
            ViewBag.uid = uid;
            ViewBag.infoname = infoName;
            ViewBag.Time = $"后台时间是:{ DateTime.Now.ToString()}";
            return View();
        }
    }
}

 

6:查看效果如下截图:

  

 7:后续难道每一个Controller都要这样写一下?感觉有些代码冗余了,下面做个小封装(当然我们还可以根据业务逻辑使用过滤器来处理):

 

==》 Core 3.0 读取系统配置文件(json文件里面的参数)  比较简单,直接截图了:

 core3.1WebApi 下方便使用Log4Net ,另外Nlog都是差不多的使用:

 

 

 

posted @   天天向上518  阅读(3911)  评论(7编辑  收藏  举报
编辑推荐:
· 浏览器原生「磁吸」效果!Anchor Positioning 锚点定位神器解析
· 没有源码,如何修改代码逻辑?
· 一个奇形怪状的面试题:Bean中的CHM要不要加volatile?
· [.NET]调用本地 Deepseek 模型
· 一个费力不讨好的项目,让我损失了近一半的绩效!
阅读排行:
· 在鹅厂做java开发是什么体验
· 百万级群聊的设计实践
· WPF到Web的无缝过渡:英雄联盟客户端的OpenSilver迁移实战
· 永远不要相信用户的输入:从 SQL 注入攻防看输入验证的重要性
· 浏览器原生「磁吸」效果!Anchor Positioning 锚点定位神器解析
点击右上角即可分享
微信分享提示