將PowershellPSCustomObject復制到陣列元素將傳遞參考，而不是值-有解無憂

不知道我做錯了什么，但是在將 Powershell 中的 PSCustomObject 復制到陣列元素時，這是通過參考復制的。看到這個：

$body = [PSCustomObject]@{ 
    albumId = $album_id;
    newMediaItems = [PSCustomObject]@()    
} 

$mediaItem = [PSCustomObject]@{
    description = "";
    simpleMediaItem = [PSCustomObject]@{ 
        fileName = "";
        uploadToken = "";
        }
}

$mediaItem.description = "Friend of Mickey Mouse"
$mediaItem.simpleMediaItem.fileName = "Goofy.txt"
$mediaItem.simpleMediaItem.uploadToken = "1111"

$body.newMediaItems  = $mediaItem.PsObject.Copy()

$mediaItem.description = "Friend of Rocker Duck"
$mediaItem.simpleMediaItem.fileName = "Donald Duck.txt"
$mediaItem.simpleMediaItem.uploadToken = "2222"

$body.newMediaItems  =  $mediaItem.PsObject.Copy()


$body | ConvertTo-Json -depth 4

輸出：

{
  "albumId": null,
  "newMediaItems": [
    {
      "description": "Friend of Mickey Mouse",
      "simpleMediaItem": {
        "fileName": "Donald Duck.txt",
        "uploadToken": "2222"
      }
    },
    {
      "description": "Friend of Rocker Duck",
      "simpleMediaItem": {
        "fileName": "Donald Duck.txt",
        "uploadToken": "2222"
      }
    }
  ]
}

uj5u.com熱心網友回復：

.psobject.Copy()執行實體的淺（成員）克隆[pscustomobject]。

由于您的simpleMediaItem屬性包含對.NET 參考型別（恰好是另一個[pscustomobject]實體）的參考，因此復制的是參考，以便[pscustomobject]通過.psobject.Copy()參考完全相同的物件獲得原始和克隆。

對于深度（遞回）克隆（沒有通用解決方案），您必須創建自定義實作。

您可以使用自class定義定義完全避免該問題：

class MediaItem {
  [string] $description
  [pscustomobject] $simpleMediaItem = [pscustomobject] @{ 
      fileName = ""
      uploadToken = ""
  }
}

現在，您可以在[MediaItem]::new()每次需要一個新的獨立實體時簡單地使用。

把它們放在一起：

class MediaItem {
  [string] $description
  [pscustomobject] $simpleMediaItem = [pscustomobject] @{ 
    fileName    = ""
    uploadToken = ""
  }
}

$body = [PSCustomObject]@{ 
  albumId       = $album_id;
  newMediaItems = @()    
} 

# Create a new instance.
$mediaItem = [MediaItem]::new()
$mediaItem.description = "Friend of Mickey Mouse"
$mediaItem.simpleMediaItem.fileName = "Goofy.txt"
$mediaItem.simpleMediaItem.uploadToken = "1111"

$body.newMediaItems  = $mediaItem

# Create a new instance.
$mediaItem = [MediaItem]::new()
$mediaItem.description = "Friend of Rocker Duck"
$mediaItem.simpleMediaItem.fileName = "Donald Duck.txt"
$mediaItem.simpleMediaItem.uploadToken = "2222"

$body.newMediaItems  = $mediaItem

$body | ConvertTo-Json -Depth 4

uj5u.com熱心網友回復：

您所看到的是預期的，您只是在復制基礎物件。我還建議您使用function或class 來執行此操作，這會更容易并且不需要復制。

$body = [PSCustomObject]@{ 
    albumId = $album_id;
    newMediaItems = [PSCustomObject]@()    
} 
$mediaItem = [PSCustomObject]@{
    description = "";
    simpleMediaItem = [PSCustomObject]@{ 
        fileName = "";
        uploadToken = "";
    }
}
$mediaItem.description = "Friend of Mickey Mouse"
$mediaItem.simpleMediaItem.fileName = "Goofy.txt"
$mediaItem.simpleMediaItem.uploadToken = "1111"

$body.newMediaItems  = $mediaItem

$base = $mediaItem.PsObject.Copy()
$child = $mediaItem.simpleMediaItem.PSObject.Copy()

$base.description = "Friend of Rocker Duck"
$child.fileName = "Donald Duck.txt"
$child.uploadToken = "2222"
$base.simpleMediaItem = $child

$body.newMediaItems  = $base

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