更新物件
新增屬性
如果要向現有物件新增屬性,可以使用 Add-Member cmdlet。使用 PSObjects,值儲存在註釋屬性型別中
$object = New-Object -TypeName PSObject -Property @{
Name = $env:username
ID = 12
Address = $null
}
Add-Member -InputObject $object -Name "SomeNewProp" -Value "A value" -MemberType NoteProperty
# Returns
PS> $Object
Name ID Address SomeNewProp
---- -- ------- -----------
nem 12 A value
你還可以使用 Select-Object Cmdlet 新增屬性(所謂的計算屬性):
$newObject = $Object | Select-Object *, @{label='SomeOtherProp'; expression={'Another value'}}
# Returns
PS> $newObject
Name ID Address SomeNewProp SomeOtherProp
---- -- ------- ----------- -------------
nem 12 A value Another value
上面的命令可以縮短為:
$newObject = $Object | Select *,@{l='SomeOtherProp';e={'Another value'}}
刪除屬性
你可以使用 Select-Object Cmdlet 從物件中刪除屬性:
$object = $newObject | Select-Object * -ExcludeProperty ID, Address
# Returns
PS> $object
Name SomeNewProp SomeOtherProp
---- ----------- -------------
nem A value Another value