.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:\nlog.txt" internalLogLevel="Debug">

   <!--
   See http://nlog-project.org/wiki/Configuration_file
   for information on customizing logging rules and outputs.
    -->
   <!--<nlog throwExceptions="true" internalLogFile="c:\nlog.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 + "\r\n" + 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 + "\r\n" + 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 + "\r\n" + 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 + "\r\n" + 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+"\r\n" + 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 = ;
             string appString = "";
             while (ex != null)
             {
                 if (count > )
                 {
                     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 + "\r\n" + msg;
             logger.Fatal(info);

         }

         #endregion
     }

5、调用

NLogger.Debug("测试");