NLog 在日志文件中包含 EventId答案

【问题标题】：NLog include EventId in log fileNLog 在日志文件中包含 EventId
【发布时间】：2019-06-22 04:14:08
【问题描述】：

.NETCore 2.2 中的 ILogger 有一个 EventId 参数。

public static void LogError(this ILogger logger, EventId eventId, string message, params object[] args);

如何让 NLog 将其输出到日志文件？

我的 nlog.config：

<?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">
    <extensions>
        <add assembly="NLog.Web.AspNetCore"/>
    </extensions>
    <targets>
        <target xsi:type="File" name="f" fileName="${aspnet-appbasepath}/Logs/${shortdate}.log"            
                layout=" ${event-properties:item=EventId.Id} ${eventId} ${eventId.Id} | ${longdate} ${uppercase:${level}} ${callsite}  ${message}" />
        </targets>
    <rules>
        <logger name="*" minlevel="Info" writeTo="f" />
    </rules>
</nlog>

问题：EventId 永远不会进入日志文件

    |   | 2019-06-21 13:13:44.8984 INFO RMD_LPCB_Web_Portal.Program.Main  init main
    |   | 2019-06-21 13:13:48.5197 WARN Microsoft.AspNetCore.HttpsPolicy.Internal.HttpsLoggingExtensions.FailedToDeterminePort  Failed to determine the https port for redirect.
    |   | 2019-06-21 13:13:54.3064 INFO RMD_LPCB_Web_Portal.Pages.Account.LoginModel+<AuthenticateEmail>d__20.MoveNext  LOGIN : Jesse.lay@state.nm.us IP: ::1 SESSION : f52d9758-bc32-7131-d7d4-7ec5224853f5
    |   | 2019-06-21 13:13:54.4070 INFO RMD_LPCB_Web_Portal.Pages.Account.LoginModel.AuthenticateActiveDirectory  Jesse.lay AD
    |   | 2019-06-21 13:13:54.4432 INFO RMD_LPCB_Web_Portal.Pages.Account.LoginModel.AuthenticateActiveDirectory  Jesse.lay AD logged in
    |   | 2019-06-21 13:13:54.4432 INFO RMD_LPCB_Web_Portal.Pages.Account.LoginModel+<AuthenticateEmail>d__20.MoveNext  LOGIN : Jesse.lay@state.nm.us IP: ::1 SESSION : f52d9758-bc32-7131-d7d4-7ec5224853f5
    |   | 2019-06-21 13:13:54.4603 INFO RMD_LPCB_Web_Portal.Pages.Account.LoginModel+<OnPostAsync>d__17.MoveNext  User Jesse.Lay@state.nm.us logged in at 6/21/2019 7:13:54 PM.
    |   | 2019-06-21 13:13:57.2319 ERROR RMD_LPCB_Web_Portal.Pages.Eoc.IndexModel.OnGet     at RMD_LPCB_Web_Portal.Pages.Eoc.IndexModel.OnGet() in C:\usr\tfs_Workspace\TSSB\RMD LPCB\Apps\RMD LPCB Web Portal\Source\RMD_LPCB_Web_Portal\Pages\Eoc\Index.cshtml.cs:line 44
    |   | 2019-06-21 13:13:58.6918 ERROR Microsoft.AspNetCore.Diagnostics.Internal.DiagnosticsLoggerExtensions.UnhandledException  An unhandled exception has occurred while executing the request.

【问题讨论】：

标签： c# asp.net-core nlog

【解决方案1】：

你可以使用

${event-properties:EventId} - 将打印 EventId 的名称，如果为空，则打印 EventId 的 id
${event-properties:EventId_Id} - 打印 id
${event-properties:EventId_Name} - 打印姓名

请注意，默认情况下不记录空事件 id - 即 id = 0 或 name 如果为空字符串或 null。

如果您需要空的 Event id，则在设置中将选项 IgnoreEmptyEventId 设置为 false：

loggerFactory.AddNLog(new NLogProviderOptions { IgnoreEmptyEventId = false });

为了完整起见，一些可能的记录器调用：

logger.LogError(new EventId(2, "eventId2"), "Message with event id number and event id name");
logger.LogError(new EventId(2), "Message with only event id number");
logger.LogError(2, "Message with only event id number");

【讨论】：