当用引号括起来时，Write-Host 会打印整个对象而不是它的一个属性

Question

$AllDrivesExceptBootDrive = Get-Volume | Where-Object {$_.DriveLetter -ne 'C'} | Select-Object DriveLetter, AllocationUnitSize

foreach ($d in $AllDrivesExceptBootDrive)
{
    Write-Host "Checking Drive $d.DriveLetter"
}

印刷：

Checking Drive @{DriveLetter=F; AllocationUnitSize=4096}.DriveLetter
Checking Drive @{DriveLetter=G; AllocationUnitSize=4096}.DriveLetter
Checking Drive @{DriveLetter=E; AllocationUnitSize=4096}.DriveLetter
Checking Drive @{DriveLetter=H; AllocationUnitSize=4096}.DriveLetter
Checking Drive @{DriveLetter=I; AllocationUnitSize=4096}.DriveLetter

如何保留引号Write-Host并仍按如下方式打印？

Checking Drive F
Checking Drive G
Checking Drive E
Checking Drive H
Checking Drive I

Answer 1

来自帮助about_Quoting_Rules主题：

只有简单的变量引用可以直接嵌入可扩展字符串中。使用数组索引或成员访问的变量引用必须包含在子表达式中。

更改字符串文字以使用子表达式运算符包围表达式$()，如下所示：

Write-Host "Checking Drive $($d.DriveLetter)"