Compare-Object返回意外输出

问题描述 投票:1回答:1

我创建了一个小函数,将Get-Volume捕获到本地文件中。下次运行该函数时,它会将新鲜的Get-Volume的输出与先前保存到文件系统的输出进行比较。

这个函数非常适合服务,但奇怪的是将一个卷作为“不同”返回,即使我们可以从输出中看到它不是。

function Compare-Volumes{
    $Path = "$Env:PROGRAMDATA\VACS\states\"
    $File = "volumes.csv"
    $Volumes = Get-Volume | Select-Object OperationalStatus, HealthStatus, DriveType, FileSystemType, DedupMode, UniqueId, AllocationUnitSize, DriveLetter, FileSystem, FileSystemLabel, Size

    if (![System.IO.File]::Exists($Path+$File)){
        $Volumes | Export-CSV -Path $Path$File -Force
    }else{
        # Load file to object, get differences, submit to API, replace previous snapshot in file with new one
        $Snapshot = Import-CSV -Path "$Path$File"
        $StatusChanges = Compare-Object -ReferenceObject ($Snapshot) -DifferenceObject ($Volumes) -Property OperationalStatus, HealthStatus, DriveType, FileSystemType, DedupMode, UniqueId, AllocationUnitSize, DriveLetter, FileSystem, FileSystemLabel, Size -IncludeEqual
        $StatusChanges
        $Volumes | Export-CSV -Path $Path$File -Force
    }
}

我的预期结果是一切都返回为相等/不变(==),因为没有任何属性发生变化,如下面的输出所示。然而由于某种原因,由SideIndicator添加的Compare-Object属性表明标记为Recovery的体积的值差异。

OperationalStatus  : Unknown
HealthStatus       : Healthy
DriveType          : CD-ROM
FileSystemType     : Unknown
DedupMode          : Disabled
UniqueId           : \\?\Volume{2b4803c9-1ebe-11e6-9bed-005056c00008}\
AllocationUnitSize : 0
DriveLetter        : E
FileSystem         : 
FileSystemLabel    : 
Size               : 0
SideIndicator      : ==

OperationalStatus  : OK
HealthStatus       : Healthy
DriveType          : Fixed
FileSystemType     : NTFS
DedupMode          : NotAvailable
UniqueId           : \\?\Volume{f688d14f-0ee7-11e5-b210-806e6f6e6963}\
AllocationUnitSize : 4096
DriveLetter        : C
FileSystem         : NTFS
FileSystemLabel    : Windows
Size               : 953903214592
SideIndicator      : ==

OperationalStatus  : Unknown
HealthStatus       : Healthy
DriveType          : CD-ROM
FileSystemType     : Unknown
DedupMode          : Disabled
UniqueId           : \\?\Volume{f688d152-0ee7-11e5-b210-806e6f6e6963}\
AllocationUnitSize : 0
DriveLetter        : D
FileSystem         : 
FileSystemLabel    : 
Size               : 0
SideIndicator      : ==

OperationalStatus  : OK
HealthStatus       : Healthy
DriveType          : Fixed
FileSystemType     : NTFS
DedupMode          : NotAvailable
UniqueId           : \\?\Volume{f688d14e-0ee7-11e5-b210-806e6f6e6963}\
AllocationUnitSize : 4096
DriveLetter        : 
FileSystem         : NTFS
FileSystemLabel    : Recovery
Size               : 6291451904
SideIndicator      : =>

OperationalStatus  : OK
HealthStatus       : Healthy
DriveType          : Fixed
FileSystemType     : NTFS
DedupMode          : NotAvailable
UniqueId           : \\?\Volume{f688d14e-0ee7-11e5-b210-806e6f6e6963}\
AllocationUnitSize : 4096
DriveLetter        : 
FileSystem         : NTFS
FileSystemLabel    : Recovery
Size               : 6291451904
SideIndicator      : <=
powershell compareobject
1个回答
1
投票

奇怪的是,DriveLetter属性比较错误 没有卷的卷(如恢复分区)。

据推测,您必须包含具有计算属性的Select-Object 这也检查DriveLetter [string]::IsNullOrEmpty() 避免将$ Null与Export-Csv的字符串化输出""进行比较

你的脚本,有点简化:

## Q:\Test\2018\12\31\SO_53990220.ps1

function Compare-Volumes{
    $FilePath = Join-Path "$Env:PROGRAMDATA\VACS\states\" "volumes.csv"

    $Volumes = Get-Volume | Select-Object OperationalStatus,HealthStatus,DriveType,
        FileSystemType, DedupMode,UniqueId,AllocationUnitSize,FileSystemLabel,FileSystem,Size,
        @{n='DriveLetter';e={if([string]::IsNullOrEmpty($_.DriveLetter)){""}else{$_.DriveLetter}}}

    if (Test-Path $FilePath){
        # Load file to object, get differences, submit to API, replace previous snapshot in file with new one
        $Snapshot = Import-CSV -Path $FilePath
        $StatusChanges = Compare-Object -ReferenceObject ($Snapshot) -DifferenceObject ($Volumes) `
          -IncludeEqual -Property OperationalStatus,HealthStatus,DriveType,FileSystemType,
          DedupMode,UniqueId,AllocationUnitSize,FileSystemLabel,FileSystem,Size,
          DriveLetter
        $StatusChanges
    }
    $Volumes | Export-CSV -Path $FilePath -Force -NoTypeInformation
}

Compare-Volumes
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