NetCore 使用Nlog自定义日志写入路径配置方式
在一些特定场景的业务需求下，日志需要写入到不同的路径下提供日志分析。
第一种：默认Nlog可以通过日志级别来区分路径，
——优点是不需要额外配置，开箱即用
——缺点是不够灵活，如果超过级别数量，则不满足需求
第二种：通过定义FileTarget来根据业务写入不同的地址
废话不多说了，直接上代码
1、创建NetCore，并且引入Nlog和NLog.Web.AspNetCore 这个就不介绍和贴图了
2、创建nlog配置文件
注意配置文件里面的：
<variable name="cuspath" value="" />
相当于根据变量的方式来定义日志输出目录
github文档说明地址：https://github.com/NLog/NLog/wiki/Configuration-file
在输入文件名称中加入变量名称：
fileName="logs/${var:cuspath}nlog-all-${shortdate}.log"
上面，默认是输出到logs/目录中
<?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="info">
<!-- enable asp.net core layout renderers -->
<extensions>
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
<variable name="cuspath" value="" />
<!-- the targets to write to -->
<targets>
<!-- write logs to file -->
<target xsi:type="File" name="allfile" fileName="logs/${var:cuspath}nlog-all-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />
<!-- another file log, only own logs. Uses some ASP.NET core renderers -->
<target xsi:type="File" name="ownFile-web" fileName="logs/${var:cuspath}nlog-all-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId_Id:whenEmpty=0}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}|${callsite}" />
</targets>
<!-- rules to map from logger name to target -->
<rules>
<!--All logs, including from Microsoft-->
<logger name="*" minlevel="Trace" writeTo="allfile" />
<!--Skip non-critical Microsoft logs and so log only own logs-->
<logger name="Microsoft.*" maxlevel="Info" final="true" />
<!-- BlackHole -->
<logger name="*" minlevel="Trace" writeTo="ownFile-web" />
</rules>
</nlog>
3、注册，在Starup.cs文件中
Configure方法里面注册下
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
loggerFactory.AddNLog();
env.ConfigureNLog("nlog.config");
app.UseMvc();
}
4、Program.cs
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.UseNLog();
5、为了扩展，我们新建一个类来处理日志的写入
namespace FytSoa.Common
{
/// <summary>
/// 日志模块
/// </summary>
public class Logger
{
NLog.Logger _logger;
private Logger(NLog.Logger logger)
{
_logger = logger;
}
public Logger(string name) : this(LogManager.GetLogger(name))
{
}
/// <summary>
/// 单例
/// </summary>
public static Logger Default { get; private set; }
static Logger()
{
Default = new Logger(LogManager.GetCurrentClassLogger());
}
private static string _path = "";
/// <summary>
/// 自定义输出目录，初始化
/// </summary>
public void Setting(string path)
{
if (_path != path)
{
_path = path;
LogManager.Configuration.Variables["cuspath"] = path+"/";
}
}
/// <summary>
/// 自定义写日志路径
/// </summary>
/// <param name="msg">消息</param>
/// <param name="path">写入地址</param>
/// <returns></returns>
public void Process(string msg, string path="")
{
_logger.Debug(msg);
}
#region Debug
public void Debug(string msg, params object[] args)
{
_logger.Debug(msg, args);
//LogManager.Shutdown();
}
public void Debug(string msg, Exception err)
{
_logger.Debug(err, msg);
//LogManager.Shutdown();
}
#endregion
#region Info
public void Info(string msg, params object[] args)
{
_logger.Info(msg, args);
//LogManager.Shutdown();
}
public void Info(string msg, Exception err)
{
_logger.Info(err, msg);
//LogManager.Shutdown();
}
#endregion
#region Warn
public void Warn(string msg, params object[] args)
{
_logger.Warn(msg, args);
//LogManager.Shutdown();
}
public void Warn(string msg, Exception err)
{
_logger.Warn(err, msg);
//LogManager.Shutdown();
}
#endregion
#region Trace
public void Trace(string msg, params object[] args)
{
_logger.Trace(msg, args);
//LogManager.Shutdown();
}
public void Trace(string msg, Exception err)
{
_logger.Trace(err, msg);
//LogManager.Shutdown();
}
#endregion
#region Error
public void Error(string msg, params object[] args)
{
_logger.Error(msg, args);
//LogManager.Shutdown();
}
public void Error(string msg, Exception err)
{
_logger.Error(err, msg);
//LogManager.Shutdown();
}
#endregion
#region Fatal
public void Fatal(string msg, params object[] args)
{
_logger.Fatal(msg, args);
//LogManager.Shutdown();
}
public void Fatal(string msg, Exception err)
{
_logger.Fatal(err, msg);
//LogManager.Shutdown();
}
#endregion
}
}
注意：
public void Setting(string path)
方法是设置目录输入位置的
6、使用方法
默认输出到logs文件夹
- Logger.Default.Info("TestDefault"+i);
自定义输入到其他目录
- 设置输出目录：Logger.Default.Setting("task");
- 调用日志方法：Logger.Default.Setting("task_log");
task_log会输出到logs/task 文件夹
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