ASP.NET Core使用NLog记录日志到Microsoft Sql Server

在之前的文章中介绍了如何在ASP.NET Core使用NLog,本文为您介绍在ASP.NET Core使用NLog记录到Microsoft Sql Server

我们需要添加依赖:

• NLog.Web.AspNetCore
• System.Data.SqlClient

添加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"
       autoReload="true"
       internalLogLevel="Warn"
       internalLogFile="logfiles/internal-nlog.txt">

   <!-- define various log targets -->
   <targets>
     <!-- write logs to file -->
     <target xsi:type="File" name="allfile" fileName="${var:configDir}\nlog-all.log"
             layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|${message} ${exception}" />

     <target xsi:type="File" name="ownFile-web" fileName="${var:configDir}\nlog-own.log"
             layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|  ${message} ${exception}" />

     <target xsi:type="Null" name="blackhole" />

     <target name="database" xsi:type="Database">

       <connectionString>${var:connectionString}</connectionString>

       <commandText>
         insert into dbo.Log (
         Application, Logged, Level, Message,
         Logger, Callsite, Exception
         ) values (
         @Application, @Logged, @Level, @Message,
         @Logger, @Callsite, @Exception
         );
       </commandText>

       <parameter name="@application" layout="AspNetCoreNlog" />
       <parameter name="@logged" layout="${date}" />
       <parameter name="@level" layout="${level}" />
       <parameter name="@message" layout="${message}" />

       <parameter name="@logger" layout="${logger}" />
       <parameter name="@callSite" layout="${callsite}" />
       <parameter name="@exception" layout="${exception:tostring}" />
     </target>
   </targets>

   <rules>
     <!--All logs, including from Microsoft-->
     <logger name="*" minlevel="Trace" writeTo="allfile" />

     <!--Skip Microsoft logs and so log only own logs-->
     <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
     <logger name="*" minlevel="Trace" writeTo="database" />
     <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
   </rules>
 </nlog>

将nlog.config复制到输出目录

设置数据库(我使用的是ef code first方式创建数据表)

 using System;

 namespace Apps.Models
 {
     public class ApplicationLog
     {
         public int Id { get; set; }
         public string Application { get; set; }
         public DateTime Logged { get; set; }
         public string Level { get; set; }
         public string Message { get; set; }
         public string Logger { get; set; }
         public string Callsite { get; set; }
         public string Exception { get; set; }
     }
 }

         protected override void OnModelCreating(ModelBuilder builder)
         {
             builder.Entity<ApplicationLog>(m =>
             {
                 m.ToTable("Log");
                 m.HasKey(c => c.Id);
                 m.Property(c => c.Application).IsRequired().HasMaxLength();
                 m.Property(c => c.Level).IsRequired().HasMaxLength();
                 m.Property(c => c.Message).IsRequired();
                 m.Property(c => c.Logger).HasMaxLength();
             });
         }

在startup.cs文件中添加:

 using NLog.Extensions.Logging;
 using NLog.Web;

 public Startup(IHostingEnvironment env)
 {
     env.ConfigureNLog("nlog.config");
 }

 // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
 public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
 {

     loggerFactory.AddNLog();

     app.AddNLogWeb();
     LogManager.Configuration.Variables["connectionString"] = Configuration.GetConnectionString("DefaultConnection");
     LogManager.Configuration.Variables["configDir"] = Configuration.GetSection("LogFilesDir").Value;
 }

appsettings.json

  "ConnectionStrings": {
    "DefaultConnection": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=logdb;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
  },
  "LogFilesDir": "c:\\temp\\nlog\\logfiles" 

然后就可以记录日志了

     public class HomeController :Controller {
         private readonly ILogger _logger;

         public HomeController(ILoggerFactory loggerFactory) {
             _logger = loggerFactory.CreateLogger<HomeController>();
         }
         public IActionResult Index() {
             _logger.LogInformation("你访问了首页");
             _logger.LogWarning("警告信息");
             _logger.LogError("错误信息");
             return View();
         }
 　　}