我正在 Visual Studio 2017 上开发 C# .NET Core 2.2 Web-Api。
我实现了 NLog 4.6.1，如 github 上所述。
当我使用 IIS 启动应用程序时，NLog 不会写入 Elasticsearch。在program.cs行发生错误
var logger = NLog.Web.NLogBuilder.ConfigureNLog("NLog.config").GetCurrentClassLogger();
我在NLogError.log
: 找到一条错误消息
2019-06-12 09:00:49.1606 Error Penter code herearsing configuration from NLog.config failed. Exception: NLog.NLogConfigurationException: Exception when parsing NLog.config. ---> System.ArgumentException: Target cannot be found: 'EventLog'
at NLog.Config.Factory`2.CreateInstance(String itemName)
at NLog.Config.LoggingConfigurationParser.ParseTargetsElement(ILoggingConfigurationElement targetsElement)
at NLog.Config.LoggingConfigurationParser.ParseNLogSection(ILoggingConfigurationElement configSection)
at NLog.Config.LoggingConfigurationParser.LoadConfig(ILoggingConfigurationElement nlogConfig, String basePath)
at NLog.Config.XmlLoggingConfiguration.ParseNLogElement(ILoggingConfigurationElement nlogElement, String filePath, Boolean autoReloadDefault)
at NLog.Config.XmlLoggingConfiguration.Initialize(XmlReader reader, String fileName, Boolean ignoreErrors)
--- End of inner exception stack trace ---
我尝试缩短配置文件以避免其他问题，但仍然出现相同的错误。目标“EventLog”就是在那里找到的。
NLog.config：
<?xml version="1.0" encoding="utf-8" ?>
<nlog autoReload="true" throwExceptions="false"
internalLogLevel="Error" internalLogFile="NLogError.log"
xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<targets>
<target name="EventLog" xsi:type="EventLog"
layout="${longdate} ${level} ${callsite} -> ${message}
${exception:format=Message,StackTrace}"
source="MonDBSvc" />
</targets>
<rules>
<logger name="MonDbSvc" minlevel="Error" writeTo="EventLog"
log="Application" />
</rules>
</nlog>
NLog.config 文件和program.cs 文件位于应用程序文件夹的同一根级别。
我尝试在上面的代码行中编写
NLog.config nad nlog.config 作为文件名。
什么可能导致此解析问题？我可以尝试什么来修复它？感谢支持！
当我将日志级别从错误更改为警告时，我会收到更明确的消息。我确信 xml 是有效的 xml。
2019-06-12 10:27:51.3735 Info Message Template Auto Format enabled
2019-06-12 10:27:51.4347 Error Parsing configuration from NLog.config failed. Exception: NLog.NLogConfigurationException: Exception when parsing NLog.config. ---> System.ArgumentException: Target cannot be found: 'EventLog'
at NLog.Config.Factory`2.CreateInstance(String itemName)
at NLog.Config.LoggingConfigurationParser.ParseTargetsElement(ILoggingConfigurationElement targetsElement)
at NLog.Config.LoggingConfigurationParser.ParseNLogSection(ILoggingConfigurationElement configSection)
at NLog.Config.LoggingConfigurationParser.LoadConfig(ILoggingConfigurationElement nlogConfig, String basePath)
at NLog.Config.XmlLoggingConfiguration.ParseNLogElement(ILoggingConfigurationElement nlogElement, String filePath, Boolean autoReloadDefault)
at NLog.Config.XmlLoggingConfiguration.Initialize(XmlReader reader, String fileName, Boolean ignoreErrors)
--- End of inner exception stack trace ---
2019-06-12 10:27:51.4347 Warn Failed loading config from NLog.config. Invalid XML?
2019-06-12 10:27:51.4597 Debug Watching path 'C:\Repositories\DataPicker\DataPicker\DataPicker.Api' filter 'NLog.config' for changes.
2019-06-12 10:27:51.4597 Debug --- NLog configuration dump ---
2019-06-12 10:27:51.4680 Debug Targets:
2019-06-12 10:27:51.4680 Debug Rules:
2019-06-12 10:27:51.4680 Debug --- End of NLog configuration dump ---
2019-06-12 10:27:51.4680 Trace FindReachableObject<System.Object>:
2019-06-12 10:27:51.4680 Info Found 0 configuration items
2019-06-12 10:27:51.4889 Debug Targets not configured for logger: DataPicker.Api.Program
2019-06-12 10:27:55.2679 Debug ScanAssembly('NLog.Web.AspNetCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c')
2019-06-12 10:27:55.7717 Debug Hide assemblies for callsite
2019-06-12 10:27:55.7717 Trace Assembly 'NLog.Extensions.Logging, Version=1.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c' will be hidden in callsite stacktrace
2019-06-12 10:27:55.7855 Debug ScanAssembly('NLog.Extensions.Logging, Version=1.0.0.0, Culture=neutral, PublicKeyToken=5120e14c03d0593c')
2019-06-12 10:27:55.7855 Trace Assembly 'Microsoft.Extensions.Logging, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' will be hidden in callsite stacktrace
2019-06-12 10:27:55.7855 Trace Assembly 'Microsoft.Extensions.Logging.Abstractions, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' will be hidden in callsite stacktrace
2019-06-12 10:27:55.8068 Debug Targets not configured for logger: Microsoft.AspNetCore.Hosting.Internal.ApplicationLifetime
2019-06-12 10:27:55.8068 Debug Targets not configured for logger: Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv
2019-06-12 10:27:55.8178 Debug Targets not configured for logger: Microsoft.AspNetCore.Server.Kestrel
2019-06-12 10:27:55.8465 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.TypeForwardingActivator
2019-06-12 10:27:55.8465 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager
2019-06-12 10:27:55.8622 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.CngGcmAuthenticatedEncryptorFactory
2019-06-12 10:27:55.8622 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.CngCbcAuthenticatedEncryptorFactory
2019-06-12 10:27:55.8622 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ManagedAuthenticatedEncryptorFactory
2019-06-12 10:27:55.8776 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.XmlEncryption.DpapiXmlEncryptor
2019-06-12 10:27:55.8776 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository
2019-06-12 10:27:55.9084 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.KeyManagement.DefaultKeyResolver
2019-06-12 10:27:55.9084 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider
2019-06-12 10:27:55.9084 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.Internal.DataProtectionStartupFilter
2019-06-12 10:27:55.9835 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.XmlEncryption.DpapiXmlDecryptor
2019-06-12 10:27:56.1465 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.Formatters.JsonPatchInputFormatter
2019-06-12 10:27:56.1465 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.Formatters.JsonInputFormatter
2019-06-12 10:27:56.1674 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.RazorPages.Internal.RazorProjectPageRouteModelProvider
2019-06-12 10:27:56.2420 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker
2019-06-12 10:27:56.2524 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.Razor.Internal.RazorViewCompiler
2019-06-12 10:27:56.2524 Debug Targets not configured for logger: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingBasedDataProtector
2019-06-12 10:27:56.2707 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.ViewFeatures.CookieTempDataProvider
2019-06-12 10:27:56.2707 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker
2019-06-12 10:27:56.2814 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.Internal.ActionSelector
2019-06-12 10:27:56.2814 Debug Targets not configured for logger: Microsoft.AspNetCore.Mvc.Internal.MvcRouteHandler
2019-06-12 10:27:56.2984 Debug Targets not configured for logger: Microsoft.AspNetCore.Builder.RouterMiddleware
2019-06-12 10:27:56.3256 Debug Targets not configured for logger: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware
2019-06-12 10:27:56.3523 Debug Targets not configured for logger: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware
2019-06-12 10:27:56.3523 Debug Targets not configured for logger: Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware
2019-06-12 10:27:56.3592 Debug Targets not configured for logger: Microsoft.AspNetCore.HttpOverrides.ForwardedHeadersMiddleware
2019-06-12 10:27:56.3592 Debug Targets not configured for logger: Microsoft.AspNetCore.Hosting.Internal.WebHost
2019-06-12 10:27:56.3783 Debug Targets not configured for logger: Microsoft.AspNetCore.Hosting.Internal.HostedServiceExecutor
后者对于事件日志目标也是如此 - 并非在所有平台上都可用：
参见
https://github.com/NLog/NLog/wiki/EventLog-target支持平台：有限（仅适用于Net35、Net40、Net45和NetStandard 2.0。注意：NetStandard 2.0必须使用NLog.WindowsEventLog包）如果您使用 .NET Core 1.x，它将无法工作 - Microsoft 没有移植该 API，因为事件日志仅适用于 Windows。
对于 .NET Core 2，您需要安装
NLog.WindowsEventLog 包并将其添加到您的 nlog.config（顶部）中：
<extensions>
<add assembly="NLog.WindowsEventLog"/>
</extensions>
请注意：您发布的错误将表明目标不可用。该配置似乎是有效的，并且不需要在记录器代码中进行任何更改。 NLog.config 或 nlog.config 也不是问题。
弹性搜索
此软件包支持 .NET Standard 1.3+ 和 .NET Standard 2+
用途：
<nlog>
<extensions>
<add assembly="NLog.Targets.ElasticSearch"/>
</extensions>
<targets>
<target name="elastic" xsi:type="BufferingWrapper" flushTimeout="5000">
<target xsi:type="ElasticSearch"/>
</target>
</targets>
<rules>
<logger name="*" minlevel="Info" writeTo="elastic" />
</rules>
</nlog>
我已经开始工作了，日志现在正在写入 Elasticsearch。 我当前的配置如下：
<?xml version="1.0" encoding="utf-8" ?>
<nlog autoReload="true" throwExceptions="false"
internalLogLevel="Error" internalLogFile="NLogError.log"
xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<extensions>
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
<targets>
<target xsi:type="Network"
name="CentralLog"
newLine ="false"
maxMessageSize="65000"
connectionCacheSize="5"
encoding="utf-8"
keepConnection="false"
maxQueueSize="100"
address="tcp://abc.xyz.org:5544"
onOverflow="Split">
<layout type="JsonLayout">
<attribute name="machinename" layout="${machinename}" />
<attribute name="level" layout="${level:upperCase=true}" />
<attribute name="processname" layout="${processname}" />
<attribute name="processid" layout="${processid}" />
</layout>
</target>
</targets>
<rules>
<logger name="*" minlevel="Trace" writeTo="CentralLog" />
</rules>
</nlog>
<logger>而不是
<target><?xml version="1.0" encoding="utf-8" ?>
<nlog autoReload="true" throwExceptions="false"
internalLogLevel="Error" internalLogFile="NLogError.log"
xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<targets>
<target name="EventLog" xsi:type="EventLog"
layout="${longdate} ${level} ${callsite} -> ${message}
${exception:format=Message,StackTrace}"
source="MonDBSvc" log="Application" />
</targets>
<rules>
<logger name="MonDbSvc" minlevel="Error" writeTo="EventLog" />
</rules>
</nlog>
更新另外，请尝试在 C# 文件中初始化您的记录器，如下所示：
var logger = LogManager.GetLogger("MonDbSvc");