C# Power shell脚本SelectSingleNode不工作

SelectSingleNode始终返回null。请帮助

元素是命名空间限定的，因此您需要在查询中指定命名空间：

   $xmlFile = "D:\ServiceConfiguration.cscfg"  
   [xml]$doc = Get-Content $xmlFile 
   $node = $doc.SelectSingleNode("/ServiceConfiguration/Role/ConfigurationSettings[@name='DiagnosticsConnectionString']") 
   $node.value = "New-Value" 
   $doc.Save($xmlFile)

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XPath错误或cscfg文件中使用了名称空间。没有输入文件很难回答。。

$xmlFile = "D:\ServiceConfiguration.cscfg"
[xml]$doc = Get-Content $xmlFile         
$ns = new-object Xml.XmlNamespaceManager $xml.NameTable
$ns.AddNamespace('dns', 'http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration')
$node = $doc.SelectSingleNode("/dns:ServiceConfiguration/dns:Role/dns:ConfigurationSettings[@name='DiagnosticsConnectionString']", $ns)      
$node.value = "New-Value"
$doc.Save($xmlFile)