NLog记录日志到本地或数据库

OperatorLog

CREATE TABLE [dbo].[OperatorLog](
    [Id] [BIGINT] IDENTITY(1,1) NOT NULL,
    [Createdate] [DATETIME] NOT NULL DEFAULT (GETDATE()),
    [CreatedBy] [NVARCHAR](50) NULL,
    [IsDeleted] [BIT] NOT NULL,
    [ModuleName] [NVARCHAR](30) NULL,
    [Origin] [NVARCHAR](50) NULL,
    [Type] [NVARCHAR](50) NULL,
    [LogLevel] [NVARCHAR](20) NOT NULL,
    [LogMessage] [NVARCHAR](500) NULL,
    [Exception] [NVARCHAR](500) NULL,    
    [Logger] [NVARCHAR](500) NULL
 CONSTRAINT [PK_OperatorLog] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'日志表主键ID' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'Id'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'创建时间' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'Createdate'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'创建人' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'CreatedBy'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'是否删除' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'IsDeleted'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'模块名称' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'ModuleName'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'来源' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'Origin'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'类型' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'Type'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'日志级别' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'LogLevel'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'日志内容' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'LogMessage'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'异常信息' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'Exception'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'日志名称' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog', @level2type=N'COLUMN',@level2name=N'Logger'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'日志记录' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'OperatorLog'
GO

PathHelper

using System;
using System.IO;
using System.Reflection;

namespace ShiShuo.Utilities
{
    public static class PathHelper
    {
        private static readonly string _appDir;
        private static readonly string _configDir;
        private static readonly string _dataDir;
        static PathHelper()
        {
            //网站与后台服务路径不同，网站需要上翻一级;后台服务则不需要;通过判断使用的配置文件是否是web.config来判断是网站，还是服务。
            bool isWeb = false;
            var appDomain = AppDomain.CurrentDomain;

            if (appDomain != null)
            {
                var startInfo = appDomain.SetupInformation;
                if (startInfo != null)
                {
                    if (startInfo.ConfigurationFile != null)
                    {
                        if (startInfo.ConfigurationFile.EndsWith("web.config", StringComparison.OrdinalIgnoreCase))
                        {
                            isWeb = true;   //配置文件是网站
                        }
                    }
                }
            }
            _appDir = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase.Substring(8))); //获取此处配置文件在程序目录
            //_appDir = _appDir.Substring(0, _appDir.Length - 4);

            if (isWeb)
            {
                _appDir = _appDir.Substring(0, _appDir.LastIndexOf("\", StringComparison.Ordinal));  // LastIndexOf("\") => LastIndexOf(@"")，向上翻一级
            }
            _configDir = Path.Combine(_appDir, "Config\");
            _dataDir = Path.Combine(_appDir, "App_Data\");
        }
        #region 公共目录
        /// <summary>
        /// 应用程序所在的目录
        /// </summary>
        public static string AppDir => _appDir;

        /// <summary>
        /// 根目录中的Cinfig文件夹
        /// </summary>
        public static string ConfigDir => _configDir;

        /// <summary>
        /// 根目录中的App_Data文件夹
        /// </summary>
        public static string DataDir => _dataDir;

        #endregion
    }
}

NLogger

using NLog;
using NLog.Config;
using System;
using System.IO;

namespace ShiShuo.Utilities {
    public class NLogger {
        readonly Logger _logger;

        private static NLogger _instance;
        private static readonly object _syncObject = new object();

        public static NLogger GetInstance() {
            if (_instance != null) {
                return _instance;
            }
            lock (_syncObject) {
                if (_instance != null) {
                    return _instance;
                }
                string configPath = Path.Combine(PathHelper.ConfigDir, "NLog.config");
                LogManager.Configuration = new XmlLoggingConfiguration(configPath, true);
                _instance = new NLogger("MyLogger");
                //_instance = new NLogger(NLog.LogManager.GetCurrentClassLogger());
                return _instance;
            }
        }

        private NLogger(NLog.Logger logger) {
            this._logger = logger;
        }

        public NLogger(string name)
            : this(NLog.LogManager.GetLogger(name)) {
        }
        public static NLogger Default { get; private set; }

        private LogEventInfo lei = new LogEventInfo();
        static NLogger() {
            string configPath = Path.Combine(PathHelper.ConfigDir, "NLog.config");
            LogManager.Configuration = new XmlLoggingConfiguration(configPath, true);
            Default = new NLogger("MyLogger");
            //Default = new NLogger(NLog.LogManager.GetCurrentClassLogger());
        }

        #region Debug
        public void Debug(string msg, params object[] args) {
            _logger.Debug(msg, args);
        }

        public void Debug(string msg, Exception err) {
            _logger.Debug(err, msg);
        }
        #endregion

        #region Info
        public void Info(string msg, params object[] args) {
            _logger.Info(msg, args);
        }

        public void Info(string msg, Exception err) {
            _logger.Info(err, msg);
        }
        #endregion

        #region Warn
        /// <summary>
        ///警告
        /// </summary>
        /// <param name="msg">警告信息</param>
        /// <param name="args">动态参数</param>
        public void Warn(string msg, params object[] args) {
            _logger.Warn(msg, args);
        }
        /// <summary>
        ///警告
        /// </summary>
        /// <param name="msg">警告信息</param>
        /// <param name="err">异常信息</param>
        public void Warn(string msg, Exception err) {
            _logger.Warn(err, msg);
        }
        #endregion

        #region Trace
        /// <summary>
        /// 使用指定的参数在跟踪级别写入诊断消息
        /// </summary>
        /// <param name="msg">跟踪信息</param>
        /// <param name="args">动态参数</param>
        public void Trace(string msg, params object[] args) {
            _logger.Trace(msg, args);
        }
        /// <summary>
        /// 使用指定的参数在跟踪级别写入诊断消息
        /// </summary>
        /// <param name="msg">跟踪信息</param>
        /// <param name="args">异常信息</param>
        public void Trace(string msg, Exception err) {
            _logger.Trace(err, msg);
        }
        #endregion

        #region Error
        /// <summary>
        /// 使用指定的参数在错误级别写入诊断消息。
        /// </summary>
        /// <param name="msg">错误信息</param>
        /// <param name="args">动态参数</param>
        public void Error(string msg, params object[] args) {
            _logger.Error(msg, args);
        }
        /// <summary>
        /// 使用指定的参数在错误级别写入诊断消息。
        /// </summary>
        /// <param name="msg">错误信息</param>
        /// <param name="args">异常信息</param>
        public void Error(string msg, Exception err) {
            _logger.Error(err, msg);
        }
        #endregion

        #region Fatal
        /// <summary>
        /// 使用指定的参数在致命级别写入诊断消息。
        /// </summary>
        /// <param name="msg">致命错误</param>
        /// <param name="args">动态参数</param>
        public void Fatal(string msg, params object[] args) {
            _logger.Fatal(msg, args);
        }
        /// <summary>
        /// 使用指定的参数在致命级别写入诊断消息。
        /// </summary>
        /// <param name="msg">致命错误</param>
        /// <param name="args">异常信息</param>
        public void Fatal(string msg, Exception err) {
            _logger.Fatal(err, msg);
        }
        #endregion

       
        /// <summary>
        /// 写入日志信息
        /// </summary>
        /// <param name="operatorLogModel">操作信息</param>
        public void InsOperatorLog(OperatorLogModel operatorLogModel) {
            var level = LogLevel.Info;
            if (!string.IsNullOrEmpty(operatorLogModel.LogLevel))
            {
                switch (operatorLogModel.LogLevel) {
                    case "Trace":
                        level = LogLevel.Trace;
                        break;
                    case "Debug":
                        level = LogLevel.Debug;
                        break;
                    case "Info":
                        level = LogLevel.Info;
                        break;
                    case "Warn":
                        level = LogLevel.Warn;
                        break;
                    case "Error":
                        level = LogLevel.Error;
                        break;
                    case "Fatal":
                        level = LogLevel.Fatal;
                        break;
                }
            }
            if (operatorLogModel.LogMessage.Length > 3000) {
                operatorLogModel.LogMessage = operatorLogModel.LogMessage.Substring(0, 3000);
            }

            lei.Properties["Createdate"] = operatorLogModel.Createdate;
            lei.Properties["IsDeleted"] = operatorLogModel.IsDeleted;
            lei.Properties["CreatedBy"] = operatorLogModel.CreatedBy;
            lei.Properties["ModuleName"] = operatorLogModel.ModuleName;
            lei.Properties["Origin"] = operatorLogModel.Origin;
            lei.Properties["LogMessage"] = operatorLogModel.LogMessage;
            lei.Properties["Type"] = operatorLogModel.Type;
            lei.Level = level;
            lei.Message = operatorLogModel.LogMessage;
            _logger.Log(level, lei);
          
        }

    }
}

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"
      autoReload="true"
      throwConfigExceptions="true"
      internalLogLevel="Debug"
      internalLogToTrace="true">
  <targets>
    <!--写入文件-->
    <target   xsi:type="File" name="DebugFile"   fileName="${basedir}/Logs/Debug/${shortdate}.log"
              layout="日志时间：${longdate}${newline}日志来源：${callsite}${newline}日志级别：${uppercase:${level}}${newline}消息内容：${message}${newline}异常信息：${exception}${newline}==============================================================${newline}" >
    </target>
    <target   xsi:type="File" name="InfoFile"    fileName="${basedir}/Logs/Debug/${shortdate}.log"
              layout="日志时间：${longdate}${newline}日志来源：${callsite}${newline}日志级别：${uppercase:${level}}${newline}消息内容：${message}${newline}异常信息：${exception}${newline}==============================================================${newline}" >
    </target>
    <target  xsi:type="File"  name="ErrorFile"   fileName="${basedir}/Logs/Debug/${shortdate}.log"
             layout="日志时间：${longdate}${newline}日志来源：${callsite}${newline}日志级别：${uppercase:${level}}${newline}消息内容：${message}${newline}异常信息：${exception}${newline}==============================================================${newline}" >
    </target>
    <target xsi:type="Database" name="DBLogFile" >
      <dbProvider>System.Data.SqlClient</dbProvider>
      <connectionString>
        Data Source=.sql2014;Initial Catalog=YIDaSi_richdata;Persist Security Info=true;User ID=sa;Password=Aa123456;
      </connectionString>
      <commandText>
        INSERT INTO OperatorLog(Createdate,CreatedBy,IsDeleted,ModuleName,Origin,Type,LogLevel,LogMessage,Exception,Logger) VALUES(@Createdate,@CreatedBy,@IsDeleted,@ModuleName,@Origin,@Type,@LogLevel,@LogMessage,@Exception,@Logger)
      </commandText>
      <!--<parameter name="@Createdate" layout="${event-context:item=Createdate}" />-->
      <parameter name="@Createdate" layout="${date}" />
      <parameter name="@CreatedBy" layout="${event-context:item=CreatedBy}" />
      <parameter name="@IsDeleted" layout="${event-context:item=IsDeleted}" />
      <parameter name="@ModuleName" layout="${event-context:item=ModuleName}" />
      <parameter name="@Origin" layout="${event-context:item=Origin}" />
      <parameter name="@Type" layout="${event-context:item=Type}" />
      <parameter name="@LogLevel" layout="${level}" />
      <!--<parameter name="@LogMessage" layout="${event-context:item=LogMessage}" />-->
      <parameter name="@LogMessage" layout="${message}" />
      <parameter name="@Exception" layout=" ${exception}" />
      <parameter name="@Logger" layout=" ${logger}" />
    </target>
  </targets>
  <rules>
    <!--根据日志级别分别写文件，也可以放一个文件中-->
    <!--<logger name="DbLogger" levels="Debug，Info,Error" writeTo="MyFile" />-->
    <logger name="MyLogger" level="Debug" writeTo="DebugFile" />
    <logger name="MyLogger" level="Info" writeTo="InfoFile" />
    <logger name="MyLogger" level="Error" writeTo="ErrorFile" />
    <!--写数据库-->
    <logger name="MyLogger" levels="Trace,Debug,Info,Error"  writeTo="DBLogFile"/>

  </rules>
</nlog>

日志插件对比

https://dotnet.libhunt.com/project/log4net/vs/semantic-logging?rel=cmp-cmp

日志记录插件源码：

 https://github.com/NLog/NLog

https://github.com/serilog/serilog

https://github.com/apache/log4net

https://github.com/elmah/Elmah

https://github.com/logary/logary 

https://www.cnblogs.com/yiliukejich0614-1234/p/9914376.html NLog组件
https://www.cnblogs.com/TianFang/p/4003749.html
https://blog.csdn.net/Dandelion_gong/article/details/78018056
https://blog.csdn.net/weixin_33915554/article/details/85521919
https://www.cnblogs.com/tider1999/p/4308440.html

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原文地址：https://www.cnblogs.com/shy1766IT/p/5381202.html