powershell - Get-Package 命令包含 xml 字符串 - 需要转换为 PSObject

Question

Get-Package SwidTagText需要来自对象的Windows 更新安装日期。该对象采用 XML 格式，我尝试转换的所有内容都不起作用。

我正在尝试从 WMI 切换，因为它拉回结果非常慢。

试过这个ConvertFrom-XML功能。也试过ConvertFrom-String

Get-Package -ProviderName msu | Select-Object *

PropertyOfSoftwareIdentity : PropertyOfSoftwareIdentity
FastPackageReference       : Definition Update for Windows Defender Antivirus - KB2267602 (Definition 1.297.486.0)
ProviderName               : msu
Source                     : 
Status                     : Installed
SearchKey                  : 
FullPath                   : ?
PackageFilename            : ?
FromTrustedSource          : False
Summary                    : Install this update to revise the definition files that are used to detect viruses, spyware, and other potentially 
                             unwanted software. Once you have installed this item, it cannot be removed.
SwidTags                   : {Definition Update for Windows Defender Antivirus - KB2267602 (Definition 1.297.486.0)}
CanonicalId                : msu:Definition Update for Windows Defender Antivirus - KB2267602 (Definition 1.297.486.0)
Metadata                   : {summary,SupportUrl,Date,ResultCode}
SwidTagText                : <?xml version="1.0" encoding="utf-16" standalone="yes"?>
                             <SoftwareIdentity
                               name="Definition Update for Windows Defender Antivirus - KB2267602 (Definition 1.297.486.0)" 
                             xmlns="http://standards.iso.org/iso/19770/-2/2015/schema.xsd">
                               <Meta
                                 summary="Install this update to revise the definition files that are used to detect viruses, spyware, and other 
                             potentially unwanted software. Once you have installed this item, it cannot be removed."
                                 SupportUrl="https://go.microsoft.com/fwlink/?LinkId=52661"
                                 Date="7/5/2019 6:17:09 PM"
                                 ResultCode="2" />
                             </SoftwareIdentity>
Dependencies               : {}
IsCorpus                   : 
Name                       : Definition Update for Windows Defender Antivirus - KB2267602 (Definition 1.297.486.0)
Version                    :

Answer 1

如果您尝试从 XML 中获取原始日期，您可以执行以下操作：

$xml = ((Get-Package -ProviderName msu) | Select-Object *).SwidTagText
foreach ($item in $xml)
    {
    $(
        $(
            [xml]$item | Select-Object "InnerXml"
        ).InnerXml | Select-Xml -XPath "//*[@Date]"
    ).Node.Date
    }

这使您可以像这样使用每个条目：

PS C:\Users\Skuld> $xml[0]
<?xml version="1.0" encoding="utf-16" standalone="yes"?>
<SoftwareIdentity
  name="Update for Windows Defender Antivirus antimalware platform - KB4052623 
(Version 4.18.1906.3)" xmlns="http://standards.iso.org/iso/19770/-2/2015/schema.xsd">
  <Meta
   summary="This package will update Windows Defender Antivirus antimalware 
platform’s components on the user machine."
    SupportUrl="https://go.microsoft.com/fwlink/?linkid=862339"
    Date="09/07/2019 10:46:52"
    ResultCode="2" />
</SoftwareIdentity>

然后，您使用 Select-XML/XPath 来挑选特定的日期属性。

我的示例将仅提供所有日期的列表，但如果您需要额外的信息，您可以对其进行调整。