.net core 杂记：日记记录

ASP.NET Core 有内置的log组件，遗憾的是看了微软官方文档，貌似无法直接将日志存于文件或数据库，只能由自己实现或引用第三方日志组件。

以下为Nlog和log4net的使用记录

Nlog使用

• 搜索添加Nuget包

Nlog
Nlog.Web.AspNetCore

• 新建一个xml文件，并改名为nlog.config

XML内容如下（可配置日志目录名称、输出格式）：

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogLevel="Warn"
      internalLogFile="internal-nlog.txt">

  <!--define various log targets-->
  <targets>
    <!--write logs to file-->
    <target xsi:type="File" name="allfile" fileName="Logs/service-${shortdate}.log"
                 layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />
  </targets>
  <rules>
    <!--All logs, including from Microsoft-->
    <logger name="*" minlevel="Trace" writeTo="allfile" />
  </rules>
</nlog>

• 将nlog.config设置输出到目录

• 在Startup类中配置

需要引入命名空间：

using NLog.Extensions.Logging;

using NLog.Web;

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactor)
{
    //使用Nlog
    loggerFactor.AddNLog();
    //引入配置文件
    env.ConfigureNLog("nlog.config");
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Error");
    }
    app.UseStaticFiles();
    app.UseCookiePolicy();

    app.UseMvc();
}

• 代码中的使用

有两中方式如下：

1、注入形式

public class IndexModel : PageModel
{
    private ILogger<IndexModel> _logger;
    public IndexModel(ILogger<IndexModel> logger)
    {
        _logger = logger;
    }
    public string Customer { get; set; }
    public void OnGet()
    {
        _logger.LogWarning("111111111111111111111");
        Customer = "123456";
    }
}

2、获取实例形式

private static Logger Logger = LogManager.GetCurrentClassLogger();
public static void Main(string[] args)
{
    Logger.Error("22222222222222222222222222222");
    Logger.Info("333333333333333333333333333333");
}

log4net

log4net已支持net core，来看下在net core下是如何配置的，与之前的版本还是有一点的区别

• 使用惯例，引用Nuget

log4net

• 新建配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <!-- This section contains the log4net configuration settings -->
  <log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
    </appender>

    <appender name="FileAppender" type="log4net.Appender.FileAppender">
      <file value="log-file.log" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="logs/" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <staticLogFileName value="false" />
      <datePattern value="yyyy-MM-dd‘.log‘" />
      <maxSizeRollBackups value="7" />
      <maximumFileSize value="1MB" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

    <!-- Setup the root category, add the appenders and set the default level -->
    <root>
      <level value="ALL" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="FileAppender" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>

  </log4net>
</configuration>

配置文件的相关说明，可以查看另一篇文章  点我跳转

• 在StartUp.cs中配置log4Net

public static ILoggerRepository repository { get; set; }
public Startup(IConfiguration configuration)
{
    Configuration = configuration;
    //log4net
    repository = LogManager.CreateRepository("NETCoreRepository");
    //指定配置文件
    XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));
}

• Controller中的使用

private ILog log = LogManager.GetLogger(Startup.repository.Name, typeof(ValuesController));

[HttpGet]
public ActionResult<IEnumerable<string>> Get()
{
    log.Info(1111111111111111111);
    return new string[] { "value1", "value2" };
}

• 控制台中的使用

ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository");
XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));
ILog log = LogManager.GetLogger(repository.Name,"NETCorelog4net");

log.Info("test log");

原文地址：https://www.cnblogs.com/qiuguochao/p/10765614.html