无法将值" "转换为类型 "System.Char"

Question

嗨，我试图创建一个PS脚本来分配驱动器号，用所需的分配单元大小格式化和标记驱动器。

CSV文件（Storage_Data_Input.txt）类似于：

DiskNumber,DriveLetter,NewFileSystemLabel,AllocationUnitSize
7,N,Drive_N,4096
7,N,Drive_N,4096

脚本如下：

########################
# New Partition/Drive letter/Format/Label/Allocation
Measure-Command{ 
Clear

$Datalist = Import-Csv "H:My DocumentsMy PowershellStorage_Data_Input.txt"
$ServerList = Get-Content "H:My DocumentsMy Powershellserverlist.txt"
ForEach ($Item in $Datalist){
$DiskNumber=$($Item.DiskNumber)
$driveletter=$($Item.DriveLetter)
$NewFileSystemLabel=$($Item.NewFileSystemLabel)
$AllocationUnitSize=$($Item.AllocationUnitSize)

$c=Get-Credential DomainUserid 
foreach ($ServerName in $ServerList){
Write-Host "Setting Drive_"$DriveLetter" on server "$ServerName""
Invoke-Command -ComputerName $ServerName -Credential $c -ScriptBlock {
Stop-Service -Name ShellHWDetection
New-Partition -DiskNumber "$DiskNumber" -UseMaximumSize -DriveLetter "$driveletter" | Format-Volume -FileSystem NTFS -NewFileSystemLabel "$NewFileSystemLabel" -AllocationUnitSize "$AllocationUnitSize" -Force -Confirm:$false
Start-Service -Name ShellHWDetection 
}}}}

执行时出现以下错误：

Cannot process argument transformation on parameter 'DriveLetter'. Cannot convert value "" to type "System.Char". Error: "String must be exactly one character long."
+ CategoryInfo          : InvalidData: (:) [New-Partition], ParameterBindin...mationException
+ FullyQualifiedErrorId : ParameterArgumentTransformationError,New-Partition
+ PSComputerName        : Servername

Answer 1

如果您正在远程执行，变量必须作为参数列表传递或使用"using"提供程序引用。

例如

Invoke-Command -ComputerName $ServerName -Credential $c -ScriptBlock {
    Stop-Service -Name ShellHWDetection
    New-Partition -DiskNumber "$using:DiskNumber" -UseMaximumSize -DriveLetter "$using:driveletter" | Format-Volume -FileSystem NTFS -NewFileSystemLabel "$using:NewFileSystemLabel" -AllocationUnitSize "$using:AllocationUnitSize" -Force -Confirm:$false
    Start-Service -Name ShellHWDetection 
}