需要安装的包
log4net 版本2.0.8
Microsoft.Extensions.Logging.Log4Net.AspNetCore 版本2.2.6
在Program中添加配置
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.ConfigureLogging((context, loggingBuilder) =>
{
loggingBuilder.AddFilter("System", LogLevel.Warning); //过滤掉 以system开头的 警告以下的错误
loggingBuilder.AddFilter("Microsoft", LogLevel.Warning);//过滤掉系统默认的一些日志
//Microsoft.Extensions.Logging.Log4Net.AspNetCore 版本2.2.6
loggingBuilder.AddLog4Net();
})
.UseStartup<Startup>();
Log4Net的配置文件,将其复制到输出目录属性设置为始终赋复制
<?xml version="1.0" encoding="utf-8"?>
<log4net>
<!-- Define some output appenders -->
<appender name="rollingAppender" type="log4net.Appender.RollingFileAppender">
<file value="log\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-->
<datePattern value="yyyyMMdd.TXT" />
<!--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="ALL" />
<param name="LevelMax" value="FATAL" />
</filter>
<!--必须结合起来用,第一个只过滤出WARN,第二个拒绝其它其它日志输出-->
<!--
<filter type="log4net.Filter.LevelMatchFilter">
<param name="LevelToMatch" value="WARN" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />-->
<layout type="log4net.Layout.PatternLayout">
<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>
在StartUp中注入ILoggerFactory
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory factory)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
ILogger<Startup> logger = factory.CreateLogger<Startup>();
logger.LogError("this is ILoggerFactory ");
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseCookiePolicy();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
在控制器中注入ILogger或者 ILoggerFactory
private readonly ILogger<HomeController> logger = null;
private readonly ILoggerFactory loggerFactory = null;
public HomeController(ILogger<HomeController> _logger, ILoggerFactory _loggerFactory)
{
logger = _logger;
loggerFactory = _loggerFactory;
}
public IActionResult Index()
{
logger.LogInformation("Home/Index 的ILogger注入");
loggerFactory.CreateLogger<HomeController>().LogWarning("Home/Index 的ILoggerFactory注入");
return View();
}