.net core nlog记录日志

1、通过nuget 查找 下载 NLog.Extensions.Logging

2、配置nlog.config文件

<?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"
      throwExceptions="true" internalLogFile="c:
log.txt" internalLogLevel="Debug">

  <!-- 
  See http://nlog-project.org/wiki/Configuration_file 
  for information on customizing logging rules and outputs.
   -->
  <!--<nlog throwExceptions="true" internalLogFile="c:
log.txt" internalLogLevel="Debug" />-->
  <targets>
    <!-- add your targets here -->
    <target xsi:type="File" name="file" fileName="${basedir}/logs/${level}/${shortdate}.log"
           layout="${longdate} ${uppercase:${level}} ${message}" />

    <!--<target type="Database" name="database" connectionString="Data Source=localhost;Initial Catalog=Test;User ID=sa;Password=sa;MultipleActiveResultSets=true; ">
      <commandText>
        insert into ErrorLog ([CreateDate], [Origin], [LogLevel], [Message], [StackTrace]) values (@createDate, @origin, @logLevel, @message, @stackTrace);
      </commandText>
      <parameter name="@createDate" layout="${longdate}"/>
      日志发生时间
      <parameter name="@origin" layout="${callsite}"/>
      日志发生时间
      <parameter name="@logLevel" layout="${level}"/>
      日志等级
      <parameter name="@message" layout="${message}"/>
      日志信息
      <parameter name="@stackTrace" layout="${stacktrace}"/>
      日志发生时间
    </target>-->
    <!--
    <target xsi:type="File" name="f" fileName="${basedir}/logs/${shortdate}.log"
            layout="${longdate} ${uppercase:${level}} ${message}" />
    -->
  </targets>

  <rules>
    <!-- add your logging rules here -->
    <logger name="*"  minlevel="Trace"  writeTo="file"/>
    <!--<logger name="*" level="Error"  appendTo="database"/>-->


  </rules>
</nlog>

3、在Configure 添加配置

 //日志
            loggerFactory.AddNLog();
            env.ConfigureNLog("Config/nlog.config");

4、往project.json 添加配置  发布输出

  "publishOptions": {
    "include": [
      "wwwroot",
      "**/*.cshtml",
      "appsettings.json",
      "web.config",
      "Config", //nlog
      "Export" //Export
    ]
  },

5、封装的操作类

 /// <summary>
    /// 日志
    /// </summary>
    public class NLogger 
    {
        private static readonly Logger logger =  LogManager.GetCurrentClassLogger();

        #region "等级1-Debug"
        /// <summary>
        /// 记录调试信息
        /// </summary>
        /// <param name="userInfo">用户信息</param>
        /// <param name="msg">具体信息</param>
        public static void Debug(string msg, string userInfo = "")
        {
            string info = string.Empty;
            if (userInfo != "")
            {
                info = userInfo;
            }
            info = info + "
" + msg;

            logger.Debug(info);
        }

        #endregion

        #region "等级2-Info"


        /// <summary>
        /// 记录信息
        /// </summary>
        /// <param name="userInfo">用户信息</param>
        /// <param name="msg">具体信息</param>
        public static void Info(string msg, string userInfo = "")
        {
            string info = string.Empty;
            if (userInfo != "")
            {
                info = userInfo;
            }
            info = info + "
" + msg;
            logger.Info(info);

        }

        #endregion

        #region "等级3-Warn"



        /// <summary>
        /// 记录警告信息
        /// </summary>
        /// <param name="userInfo">用户信息</param>
        /// <param name="msg">具体信息</param>
        public static void Warn(string msg, string userInfo = "")
        {
            string info = string.Empty;
            if (userInfo != "")
            {
                info = userInfo;
            }
            info = info + "
" + msg;
            logger.Warn(info);

        }

        #endregion

        #region "等级4-Error"


        /// <summary>
        /// 记录错误信息
        /// </summary>
        /// <param name="userInfo">用户信息</param>
        /// <param name="msg">具体信息</param>
        public static void Error(string msg, string userInfo = "")
        {
            string info = string.Empty;
            if (userInfo != "")
            {
                info = userInfo;
            }
            info = info + "
" + msg;
            logger.Error(info);

        }



        /// <summary>
        /// 记录异常信息
        /// </summary>
        /// <param name="userInfo">用户信息</param>
        /// <param name="ex">具体异常</param>
        public static void Error(Exception ex, string userInfo = "")
        {
            string info = "";
            if (userInfo != "")
            {
                info =   userInfo;
            }
            info =  info+"
" + ErrorDetails(ex);
            logger.Error(info);

        }

        /// <summary>
        /// 将异常转成字符串
        /// </summary>
        /// <param name="ex"></param>
        /// <returns></returns>
        private static string ErrorDetails(Exception ex)
        {
            StringBuilder sb = new StringBuilder();
            int count = 0;
            string appString = "";
            while (ex != null)
            {
                if (count > 0)
                {
                    appString += "　";
                }
                sb.AppendLine(appString + " <br>异常消息：" + ex.Message);
                sb.AppendLine(appString + " <br>异常类型：" + ex.GetType().FullName);
              //  sb.AppendLine(appString + " <br>异常方法：" + (ex.TargetSite == null ? null : ex.TargetSite.Name));
                sb.AppendLine(appString + " <br>异常源：" + ex.Source);
                if (ex.StackTrace != null)
                {
                    sb.AppendLine(appString + "<br>异常堆栈：" + ex.StackTrace);
                }
                if (ex.InnerException != null)
                {
                    sb.AppendLine(appString + "<br>内部异常：");
                    count++;
                }
                ex = ex.InnerException;
            }

            return sb.ToString().Replace("位置:", "<br>位置");
        }

        #endregion

        #region "等级5-Fatal "



        /// <summary>
        /// 记录致命错误
        /// </summary>
        /// <param name="userInfo">用户信息</param>
        /// <param name="msg">具体信息</param>
        public static void Fatal(string msg, string userInfo = "")
        {
            string info = string.Empty;
            if (userInfo != "")
            {
                info = userInfo;
            }
            info = info + "
" + msg;
            logger.Fatal(info);

        }

        #endregion
    }

5、调用

NLogger.Debug("测试");