.NET Core使用Nlog记录日志

今天药忘吃喽~ 2022-04-11 10:09 298阅读 0赞

### 1.引入Nuget包 ###

Nlog

Nlog.Web.AspNetCore

### 2.添加nlog配置文件 ###

<?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"
         autoReload="true"
           internalLogLevel="Warn"
           internalLogFile="internal-nlog.txt">
         
         <targets>
            
             <target xsi:type="File" name="allfile" fileName="nlog-all-${shortdate}.log"
                      layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />
        
             <target xsi:type="File" name="ownFile-web" fileName="nlog-my-${shortdate}.log"
                      layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" />
            <target xsi:type="Null" name="blackhole" />
      </targets>
         <rules>
             
             <logger name="*" minlevel="Trace" writeTo="allfile" />
        
           
             <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
             <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
      </rules>
    </nlog>

### 3.在StartUp.cs中配置nlog ###

public void Configure(IApplicationBuilder app, IHostingEnvironment env,ILoggerFactory loggerFactory)
            {
                app.UseStaticFiles();
                //使用NLog作为日志记录工具
                loggerFactory.AddNLog();
                //引入Nlog配置文件
                env.ConfigureNLog("nlog.config");
                if (env.IsDevelopment())
                {
                    app.UseDeveloperExceptionPage();
                } 
                app.UseMvc();
            }

### 4.在程序中中使用nlog写日志 ###

下面是注入到控制器中的示例

public class ValuesController : Controller
        {
         
            private ILogger<ValuesController> logger;
            public ValuesController(ILogger<ValuesController> _logger)
            {
                logger = _logger;
            }
            // GET api/values
            [HttpGet]
            public string Get()
            {
                logger.LogError("123");
                return "value";
            }

### 5.日志文件生成在指定目录下 ###

大家会发现文件是生成在项目目录下的，日志多的时候，会导致文件目录太乱

此时，只需更改nlog.config中的内容如下即可生成在logs目录里