如何在Powershell中迭代XML？

我在文本文件中有这个XML文档：

<?xml version="1.0"?>
<Objects>
  <Object Type="System.Management.Automation.PSCustomObject">
    <Property Name="displayName" Type="System.String">sql Server (MSsqlSERVER)</Property>
    <Property Name="ServiceState" Type="Microsoft.sqlServer.Management.Smo.Wmi.ServiceState">Running</Property>
  </Object>
  <Object Type="System.Management.Automation.PSCustomObject">
    <Property Name="displayName" Type="System.String">sql Server Agent (MSsqlSERVER)</Property>
    <Property Name="ServiceState" Type="Microsoft.sqlServer.Management.Smo.Wmi.ServiceState">Stopped</Property>
  </Object>
</Objects>

我想迭代每个对象,找到displayName和ServiceState.我该怎么办？我尝试了各种组合,并努力解决这个问题.

我这样做是为了将XML转换为变量：

[xml] $priorServiceStates = Get-Content $serviceStatePath;

其中$serviceStatePath是上面显示的xml文件名.然后我想我可以这样做：

foreach ($obj in $priorServiceStates.Objects.Object)
{
    if($obj.ServiceState -eq "Running")
    {
        $obj.displayName;
    }
}

在这个例子中我想要一个用sql Server输出的字符串(MSsqlSERVER)

PowerShell具有内置的XML和XPath功能.
您可以将@R_376_3270@ cmdlet与XPath查询一起使用,从而从XML对象中选择节点
.Node.’#text’来访问节点值.

[xml]$xml = Get-Content $serviceStatePath
$nodes = @R_376_3270@ "//Object[Property/@Name='ServiceState' and Property='Running']/Property[@Name='displayName']" $xml
$nodes | ForEach-Object {$_.Node.'#text'}

或者更短

[xml]$xml = Get-Content $serviceStatePath
@R_376_3270@ "//Object[Property/@Name='ServiceState' and Property='Running']/Property[@Name='displayName']" $xml |
  % {$_.Node.'#text'}