Powershell中不存在特定对象属性时如何删除条目？

Posted 2023-03-27

【中文标题】Powershell中不存在特定对象属性时如何删除条目？

【英文标题】：How to delete entries when a specific object property does not exists in Powershell?

【发布时间】：2021-12-22 01:45:17

【问题描述】：

例如，在下面的 PSCustomObject 中，我希望删除不存在 TagName 的对象

$dataset1 = @(
    @
        MachineName = "AAA"
        ID   = "111"
        TagName = "GroupA"
    ,
    @
        MachineName = "BBB"
        ID   = "222"
        TagName = "GroupB"
    ,
    @
        MachineName = "CCC"
        ID   = "111"
        TagName = ""
    ,
    @
        MachineName = "DDD"
        ID   = "333"
        TagName = ""
    ,
    @
        MachineName = "EEE"
        ID   = "111"
        TagName = ""
    
    

因此，删除后 $dataset1 应包含以下内容：

$dataset1 = @(
    @
        MachineName = "AAA"
        ID   = "111"
        TagName = "GroupA"
    ,
    @
        MachineName = "BBB"
        ID   = "222"
        TagName = "GroupB"
    
   

【问题讨论】：

为什么只是$dataset1 | where $_.TagName -ne "" ？

【参考方案1】：

您可以使用Where-Object（或别名where）。 Where-Object 返回脚本块语句为真的所有对象

$dataset1 = $dataset1 | Where-Object  $_.TagName