我使用Get-AppxPackage将所有软件包安装在PC上，并且尝试使用Select-String前后使用N行查找所有匹配项。

但是，选择字符串仅将匹配项显示为单行，并且也不显示所有匹配项。仅当我通过管道传输Get-AppxPackage的输出时才会发生这种情况，而不是将其写入文件然后执行cat <filename> | select-string ...的情况。

如您在下面的示例中看到的，使用pipe和cat的两个结果。我对类似cat的结果感兴趣，即有关该应用的详细信息。

那么我在这里做错了什么？为什么输出不同？

示例（每个人都应该拥有MS Edge，所以我将其用作示例）：

PS > Get-AppxPackage | Select-String -pattern 'edge' -context 3,3 -allmatches

  microsoft.Windows.StartMenuExperienceHost_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
  microsoft.Windows.Cortana_1.13.0.18362_neutral_neutral_cw5n1h2txyewy
  microsoft.AAD.BrokerPlugin_1000.18362.329.0_neutral_neutral_cw5n1h2txyewy
> microsoft.microsoftEdge_44.18362.329.0_neutral__8wekyb3d8bbwe
  microsoft.Windows.CloudExperienceHost_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
  microsoft.Windows.ContentDeliveryManager_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
  Windows.CBSPreview_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
  microsoft.Windows.Apprep.ChxApp_1000.18362.329.0_neutral_neutral_cw5n1h2txyewy
  microsoft.Win32WebViewHost_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
  microsoft.PPIProjection_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
> microsoft.microsoftEdgeDevToolsClient_1000.18362.329.0_neutral_neutral_8wekyb3d8bbwe
  microsoft.LockApp_10.0.18362.329_neutral__cw5n1h2txyewy
> microsoft.EdgeDevtoolsPlugin_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
  microsoft.ECApp_10.0.18362.329_neutral__8wekyb3d8bbwe
  microsoft.CredDialogHost_10.0.18362.329_neutral__cw5n1h2txyewy
  microsoft.BioEnrollment_10.0.18362.329_neutral__cw5n1h2txyewy

PS > cat .\appx-packages.txt | select-string -pattern 'edge' -context 3,3 -allmatches

  SignatureKind     : System
  Status            : Ok

> Name              : microsoft.microsoftEdge
  Publisher         : CN=microsoft Corporation,O=microsoft Corporation,L=Redmond,S=Washington,C=US
  Architecture      : Neutral
  ResourceId        :
  Version           : 44.18362.329.0
> PackageFullName   : microsoft.microsoftEdge_44.18362.329.0_neutral__8wekyb3d8bbwe
> InstallLocation   : C:\Windows\SystemApps\microsoft.microsoftEdge_8wekyb3d8bbwe
  IsFramework       : False
> PackageFamilyName : microsoft.microsoftEdge_8wekyb3d8bbwe
  PublisherId       : 8wekyb3d8bbwe
  IsResourcePackage : False
  IsBundle          : False
  SignatureKind     : System
  Status            : Ok

> Name              : microsoft.microsoftEdgeDevToolsClient
  Publisher         : CN=microsoft Corporation,C=US
  Architecture      : Neutral
  ResourceId        : neutral
  Version           : 1000.18362.329.0
> PackageFullName   : microsoft.microsoftEdgeDevToolsClient_1000.18362.329.0_neutral_neutral_8wekyb3d8bbwe
> InstallLocation   : C:\Windows\SystemApps\microsoft.microsoftEdgeDevToolsClient_8wekyb3d8bbwe
  IsFramework       : False
> PackageFamilyName : microsoft.microsoftEdgeDevToolsClient_8wekyb3d8bbwe
  PublisherId       : 8wekyb3d8bbwe
  IsResourcePackage : False
  IsBundle          : False
  SignatureKind     : System
  Status            : Ok

> Name              : microsoft.EdgeDevtoolsPlugin
  Publisher         : CN=microsoft Windows,C=US
  Architecture      : Neutral
  ResourceId        : neutral
  Version           : 10.0.18362.329
> PackageFullName   : microsoft.EdgeDevtoolsPlugin_10.0.18362.329_neutral_neutral_cw5n1h2txyewy
> InstallLocation   : C:\Windows\SystemApps\microsoft.EdgeDevtoolsPlugin_cw5n1h2txyewy
  IsFramework       : False
> PackageFamilyName : microsoft.EdgeDevtoolsPlugin_cw5n1h2txyewy
  PublisherId       : cw5n1h2txyewy
  IsResourcePackage : False
  IsBundle          : False