Log4Net在Net6 WebApi中的应用

Log4Net在Net6 WebApi中的应用

• 下载依赖

  • log4net
  • Microsoft.Extensions.Logging.Log4Net.AspNetCore

• 拷贝日志配置文件 \Config\log4net.config，必须设置为始终复制

  <?xml version="1.0" encoding="utf-8"?>
  <configuration>
    <!-- This section contains the log4net configuration settings -->
    <log4net>
      <!--根配置-->
      <root>
        <!--日志级别:可选值: ERROR > WARN > INFO > DEBUG -->
        <level value="DEBUG"/>
        <appender-ref ref="ErrorLog" />
      </root>
      <!-- 错误 Error.log-->
      <appender name="ErrorLog" type="log4net.Appender.RollingFileAppender">
        <!--目录路径，可以是相对路径或绝对路径-->
        <file value="Logs/" />
        <!--文件名，按日期生成文件夹-->
        <param name="DatePattern" value="yyyy-MM-dd'.log'"/>
        <!--追加到文件-->
        <appendToFile value="true"/>
        <!--创建日志文件的方式，可选值：Date[日期],文件大小[Size],混合[Composite]-->
        <rollingStyle value="Composite"/>
        <!--写到一个文件-->
        <staticLogFileName value="false"/>
        <!--单个文件大小。单位:KB|MB|GB-->
        <maximumFileSize value="50MB"/>
        <!--最多保留的文件数，设为"-1"则不限-->
        <maxSizeRollBackups value="-1"/>
        <!--日志格式-->
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date   [%thread]  %-5level  %message%newline------------------------------------------------------------------------------------%n" />
        </layout>
        <filter type="log4net.Filter.LevelRangeFilter">
          <param name="LevelMin" value="ALL" />
          <param name="LevelMax" value="FATAL" />
        </filter>
      </appender>
    </log4net>
  </configuration>
  

• 创建过滤类Log4Extention

  public static class Log4Extention
      {
          public static void InitLog4(ILoggingBuilder loggingBuilder)
          {
              loggingBuilder.AddFilter("System", LogLevel.Warning);
              loggingBuilder.AddFilter("Microsoft", LogLevel.Warning);//过滤掉系统默认的一些日志
              loggingBuilder.AddLog4Net(new Log4NetProviderOptions()
              {
                  Log4NetConfigFileName = "Config/log4net.config",
                  Watch = true
              });
          }
      }
  }
  

• Programm.cs

  #region 添加Log4net
  // 必须引入该包 Log4Net 以及 Microsoft.Extensions.Logging.Log4Net.AspNetCore
  
  builder.Host.ConfigureLogging((context, loggingBuilder) =>
  {
      Log4Extention.InitLog4(loggingBuilder);
  });
  #endregion
  

• 调用

  [ApiController]
      [Route("[controller]")]
      public class WeatherForecastController : ControllerBase
      {
          private static readonly string[] Summaries = new[]
          {
          "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
      };
  
          private readonly ILogger<WeatherForecastController> _logger;
  
          public WeatherForecastController(ILogger<WeatherForecastController> logger)
          {
  
              _logger = logger;
              _logger.LogInformation("WeatherForecastController 构造了");
          }
  
          [HttpGet(Name = "GetWeatherForecast")]
          public IEnumerable<WeatherForecast> Get()
          {
              _logger.LogWarning("程序Get被调用了");
              return Enumerable.Range(1, 5).Select(index => new WeatherForecast
              {
                  Date = DateTime.Now.AddDays(index),
                  TemperatureC = Random.Shared.Next(-20, 55),
                  Summary = Summaries[Random.Shared.Next(Summaries.Length)]
              })
              .ToArray();
          }
      }