Powershell 从数组中提取单个项

我试图从

$Win32\u OperatingSystem.SystemDrive

变量中提取存储在系统驱动器

$Win32\u LogicalDisk

中的信息

$Temp_SystemDrive = $Win32_logicalDisk |
    Select DeviceID, FreeSpace, Size |
    Where-Object (($_.DeviceID) -like ($Win32_OperatingSystem.SystemDrive));
$Temp_SystemDrive

---

Win32\u LogicalDisk

和

Win32\u OperatingSystem

不是变量，它们是WMI类。您需要使用

获取WmiObject

来访问它们。试试这个：

#Save OS-information early to clean up your code
$os = (Get-WmiObject Win32_OperatingSystem)

#Save the ORIGINAL object for disk in the case you need more info later
$Temp_SystemDrive = Get-WmiObject Win32_LogicalDisk | Where-Object { $_.DeviceID -eq $os.SystemDrive }

#Get the properties you need
$Temp_SystemDrive | Select DeviceID, FreeSpace, Size

---

Win32\u LogicalDisk

和

Win32\u OperatingSystem

不是变量，它们是WMI类。您需要使用

获取WmiObject

来访问它们。试试这个：

#Save OS-information early to clean up your code
$os = (Get-WmiObject Win32_OperatingSystem)

#Save the ORIGINAL object for disk in the case you need more info later
$Temp_SystemDrive = Get-WmiObject Win32_LogicalDisk | Where-Object { $_.DeviceID -eq $os.SystemDrive }

#Get the properties you need
$Temp_SystemDrive | Select DeviceID, FreeSpace, Size

---

要获得最佳性能，请仅提取所需的字段，并在查询级别应用筛选器，而不是在以下情况之后：

$os = Get-WmiObject -Query "SELECT SystemDrive FROM Win32_OperatingSystem"
$wmiQuery = "SELECT DeviceID, FreeSpace, Size " + 
              "FROM Win32_LogicalDisk " +
             "WHERE DeviceID='$($os.SystemDrive)'"
Get-WmiObject -Query $wmiQuery

---

要获得最佳性能，请仅提取所需的字段，并在查询级别应用筛选器，而不是在以下情况之后：

$os = Get-WmiObject -Query "SELECT SystemDrive FROM Win32_OperatingSystem"
$wmiQuery = "SELECT DeviceID, FreeSpace, Size " + 
              "FROM Win32_LogicalDisk " +
             "WHERE DeviceID='$($os.SystemDrive)'"
Get-WmiObject -Query $wmiQuery

---

获取WmiObject

可以自己进行过滤：

获取WmiObject Win32_LogicalDisk-Filter“DeviceID=”$（$os.SystemDrive）“

获取WmiObject可以自己进行过滤：

获取WmiObject Win32_LogicalDisk-Filter“DeviceID=”$（$os.SystemDrive）“