ASP.NET Core 中的日志记录
日志级别: Trace -》Debug-》 Information -》Warning-》 Error-》 Critical
级别包含范围由大到小 , 如 Trace 就包含了所有信息.
基础用法
- public class HomeController : Controller
- {
- private readonly ILogger _logger;
- public HomeController(ILogger<HomeController> logger)
- {
- _logger = logger;
- }
- 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();
- }
- }
日志事件 ID
- public class LoggingEvents
- {
- public const int GenerateItems = 1000;
- public const int ListItems = 1001;
- public const int GetItem = 1002;
- public const int InsertItem = 1003;
- public const int UpdateItem = 1004;
- public const int DeleteItem = 1005;
- public const int GetItemNotFound = 4000;
- public const int UpdateItemNotFound = 4001;
- }
- _logger.LogWarning(LoggingEvents.GetItemNotFound, "GetById({ID}) NOT FOUND", 100);
结果:
- warn: TodoApi.Controllers.TodoController[4000]
- GetById(100) NOT FOUND
NLog 输出到文件
- https://github.com/NLog/NLog.web/wiki
- ASP.NET core 2
Create a nlog.config file.
- <?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="info"
- internalLogFile="c:\temp\internal-nlog.txt">
- <!-- enable asp.net core layout renderers -->
- <extensions>
- <add assembly="NLog.Web.AspNetCore"/>
- </extensions>
- <!-- the targets to write to -->
- <targets>
- <!-- write logs to file -->
- <target xsi:type="File" name="allfile" fileName="c:\temp\nlog-all-${shortdate}.log"
- layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />
- <!-- another file log, only own logs. Uses some ASP.NET core renderers -->
- <target xsi:type="File" name="ownFile-web" fileName="c:\temp\nlog-own-${shortdate}.log"
- layout="${longdate}|${event-properties:item=EventId_Id}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}" />
- </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 without writeTo -->
- <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
- </rules>
- </nlog>
复制到输出目录: 始终复制
Update program.cs
这里 nlog-all-.log 是记录所有日志, nlog-own-.log 记录跳过 Microsoft 开头的类库输出的相关信息, 剩下的信息.
参考: https://www.cnblogs.com/linezero/p/Logging.html
来源: http://www.bubuko.com/infodetail-2871592.html