我只想选择具有“名称”属性值 = 'syslog' 的目标元素。无论如何,我总是得到一个 NullReferenceException。谁能帮我找出问题所在?
---------------- 我的代码 -------------------------------- ------------
XmlNode root = _configFile.DocumentElement; // root is not none, and is correct.
XmlNode syslogNode = root.SelectSingleNode("descendant::targets/target[@name='syslog']"); // the syslogNode is null
------我的 XML 文件 ------------------ --------
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<extensions>
<add assembly="NLog.Targets.Syslog" />
</extensions>
<targets>
<target name="syslog" xsi:type="Syslog" syslogserver="127.0.0.1" port="514" facility="Local7" />
<target name="file" xsi:type="File" layout="${level} | ${longdate} | ${callsite:className=true:fileName=false:includeSourcePath=false:methodName=true} | ${message} ${exception:format=tostring}"
fileName="${specialfolder:folder=LocalApplicationData}/Televic Conference/CoCon/Log/server_log_${shortdate}.txt"
archiveFileName="${specialfolder:folder=LocalApplicationData}/Televic Conference/CoCon/Log/Archives/server_log.{#}.txt"
archiveEvery="Day" archiveNumbering="Rolling" maxArchiveFiles="20" concurrentWrites="true" keepFileOpen="false"/>
<target name="console" xsi:type="ColoredConsole" layout="${longdate}: ${message}"/>
<target name="debug" xsi:type="OutputDebugString" layout="${longdate}: ${message}"/>
</targets>
<rules>
<logger name="*" minLevel="Trace" appendTo="syslog"/>
<logger name="*" minlevel="Trace" writeTo="file" />
</rules>
</nlog>