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

1.我们需要添加依赖:

NLog.Web.AspNetCore

System.Data.SqlClient

2.添加nlog.config文件

1 <?xml version="1.0" encoding="utf-8" ?>
2 <nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
3       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4       autoReload="true"
5       internalLogLevel="Warn"
6       internalLogFile="logfiles/internal-nlog.txt">
7
8   <!-- define various log targets -->
9   <targets>
10     <!-- write logs to file -->
11     <target xsi:type="File" name="allfile" fileName="${var:configDir}\nlog-all.log"
12             layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|${message} ${exception}" />
13
14
15     <target xsi:type="File" name="ownFile-web" fileName="${var:configDir}\nlog-own.log"
16             layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|  ${message} ${exception}" />
17
18     <target xsi:type="Null" name="blackhole" />
19
20     <target name="database" xsi:type="Database">
21
22       <connectionString>${var:connectionString}</connectionString>
23
24
25       <commandText>
26         insert into dbo.Log (
27         Application, Logged, Level, Message,
28         Logger, Callsite, Exception
29         ) values (
30         @Application, @Logged, @Level, @Message,
31         @Logger, @Callsite, @Exception
32         );
33       </commandText>
34
35       <parameter name="@application" layout="AspNetCoreNlog" />
36       <parameter name="@logged" layout="${date}" />
37       <parameter name="@level" layout="${level}" />
38       <parameter name="@message" layout="${message}" />
39
40       <parameter name="@logger" layout="${logger}" />
41       <parameter name="@callSite" layout="${callsite}" />
42       <parameter name="@exception" layout="${exception:tostring}" />
43     </target>
44   </targets>
45
46   <rules>
47     <!--All logs, including from Microsoft-->
48     <logger name="*" minlevel="Trace" writeTo="allfile" />
49
50     <!--Skip Microsoft logs and so log only own logs-->
51     <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
52     <logger name="*" minlevel="Trace" writeTo="database" />
53     <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
54   </rules>
55 </nlog>

3.将nlog.config复制到输出目录



4.设置数据库(我使用的是ef code first方式创建数据表)

1 using System;
2
3 namespace Apps.Models
4 {
5     public class ApplicationLog
6     {
7         public int Id { get; set; }
8         public string Application { get; set; }
9         public DateTime Logged { get; set; }
10         public string Level { get; set; }
11         public string Message { get; set; }
12         public string Logger { get; set; }
13         public string Callsite { get; set; }
14         public string Exception { get; set; }
15     }
16 }

1         protected override void OnModelCreating(ModelBuilder builder)
2         {
3             builder.Entity<ApplicationLog>(m =>
4             {
5                 m.ToTable("Log");
6                 m.HasKey(c => c.Id);
7                 m.Property(c => c.Application).IsRequired().HasMaxLength(50);
8                 m.Property(c => c.Level).IsRequired().HasMaxLength(50);
9                 m.Property(c => c.Message).IsRequired();
10                 m.Property(c => c.Logger).HasMaxLength(250);
11             });
12         }

5.在startup.cs文件中添加:

1 using NLog.Extensions.Logging;
2 using NLog.Web;
3
4 public Startup(IHostingEnvironment env)
5 {
6     env.ConfigureNLog("nlog.config");
7 }
8
9 // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
10 public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
11 {
12
13
14     loggerFactory.AddNLog();
15
16     app.AddNLogWeb();
17     LogManager.Configuration.Variables["connectionString"] = Configuration.GetConnectionString("DefaultConnection");
18     LogManager.Configuration.Variables["configDir"] = Configuration.GetSection("LogFilesDir").Value;
19 }

6.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"

7.然后就可以记录日志了

1     public class HomeController :Controller {
2         private readonly ILogger _logger;
3
4         public HomeController(ILoggerFactory loggerFactory) {
5             _logger = loggerFactory.CreateLogger<HomeController>();
6         }
7         public IActionResult Index() {
8             _logger.LogInformation("你访问了首页");
9             _logger.LogWarning("警告信息");
10             _logger.LogError("错误信息");
11             return View();
12         }
13 　　}