C# NLog 配置

首先用NuGet安装NLog依赖DLL

NLog

NLog.Config

NLog.Schema

NLog配置文件NLog.config：

<?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"
      xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"
      autoReload="true"
      throwExceptions="false"
      internalLogLevel="Off"
      internalLogFile="d:
log
log-internal.log">

  <!-- optional, add some variables
  https://github.com/nlog/NLog/wiki/Configuration-file#variables
  -->
  <!--<variable name="myvar" value="myvalue"/>-->

  <variable name="logDir" value="${basedir}/nlog"/>
  <variable name="logFileName" value="${date:format=yyyyMMdd}.txt"/>
  <variable name="logArchiveFileName" value="${date:format=yyyyMMdd}_{#}.txt"/>
  <variable name="logLayout" value="${date:format=yyyy-MM-dd HH:mm:ss.fff} [${level}] ${message}"/>

  <!--
  See https://github.com/nlog/nlog/wiki/Configuration-file
  for information on customizing logging rules and outputs.
   -->

  <targets>

    <!--
    add your targets here
    See https://github.com/nlog/NLog/wiki/Targets for possible targets.
    See https://github.com/nlog/NLog/wiki/Layout-Renderers for the possible layout renderers.
    -->

    <!--
    Write events to a file with the date in the filename.
    <target xsi:type="File" name="f" fileName="${basedir}/logs/${shortdate}.log"
            layout="${longdate} ${uppercase:${level}} ${message}" />
    -->

    <target xsi:type="File" name="info"
            layout="${logLayout}"
            fileName="${logDir}/info/${logFileName}"
            archiveFileName="${logDir}/info/${logArchiveFileName}"
            archiveAboveSize="10485760"
            archiveNumbering="Sequence"
            maxArchiveFiles="100"
            concurrentWrites="true"
            keepFileOpen="true"
            openFileCacheTimeout="30"
            encoding="UTF-8" />

    <target xsi:type="File" name="debug"
            layout="${logLayout}"
            fileName="${logDir}/debug/${logFileName}"
            archiveFileName="${logDir}/debug/${logArchiveFileName}"
            archiveAboveSize="10485760"
            archiveNumbering="Sequence"
            maxArchiveFiles="100"
            concurrentWrites="true"
            keepFileOpen="true"
            openFileCacheTimeout="30"
            encoding="UTF-8" />

    <target xsi:type="File" name="error"
            layout="${logLayout}"
            fileName="${logDir}/error/${logFileName}"
            archiveFileName="${logDir}/error/${logArchiveFileName}"
            archiveAboveSize="10485760"
            archiveNumbering="Sequence"
            maxArchiveFiles="100"
            concurrentWrites="true"
            keepFileOpen="true"
            openFileCacheTimeout="30"
            encoding="UTF-8" />

  </targets>

  <rules>
    <!-- add your logging rules here -->

    <!--
    Write all events with minimal level of Debug (So Debug, Info, Warn, Error and Fatal, but not Trace)  to "f"
    <logger name="*" minlevel="Debug" writeTo="f" />
    -->

    <logger name="*" minlevel="Info" maxlevel="Info" writeTo="info" />

    <logger name="*" minlevel="Debug" maxlevel="Debug" writeTo="debug" />

    <logger name="*" minlevel="Error" maxlevel="Error" writeTo="error" />

  </rules>
</nlog>

变量定义：

private Logger _log = NLog.LogManager.GetLogger("NLogTest");

或者：

private Logger _log = NLog.LogManager.GetCurrentClassLogger();

写日志示例：

private void button4_Click(object sender, EventArgs e)
{
    Task.Run(() =>
    {
        Log("==== 开始 ========");
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();
        List<Task> taskList = new List<Task>();
        Task tsk = null;
        int taskCount = 0;

        tsk = Task.Run(() =>
        {
            for (int i = 0; i < n; i++)
            {
                _log.Info("测试日志 " + i.ToString("000000"));
                Interlocked.Increment(ref taskCount);
            }
        });
        taskList.Add(tsk);

        tsk = Task.Run(() =>
        {
            for (int i = 0; i < n; i++)
            {
                _log.Debug("测试日志 " + i.ToString("000000"));
                Interlocked.Increment(ref taskCount);
            }
        });
        taskList.Add(tsk);

        tsk = Task.Run(() =>
        {
            for (int i = 0; i < n; i++)
            {
                _log.Error("测试日志 " + i.ToString("000000"));
                Interlocked.Increment(ref taskCount);
            }
        });
        taskList.Add(tsk);

        Task.WaitAll(taskList.ToArray());
        Log("Task Count=" + taskCount);

        Log("==== 结束 " + "，耗时：" + stopwatch.Elapsed.TotalSeconds.ToString("0.000") + " 秒 ========");
        stopwatch.Stop();
    });
}