C＃中的WMI问题 [英] Problem with WMI in C#

问题描述

我正在尝试在C＃中使用WMI来查询连接的硬盘信息。基本上，我试图将Powershell脚本转换为C＃。但是，我撞墙了。在Powershell中，我有一行：

I am trying to use WMI in C# to query the connected hard disk information. Basically, I am trying to convert a Powershell script to C#. However, I've hit a wall. In Powershell, I have a line:

$testdrv = Get-WmiObject -Class win32_volume -Filter "DriveLetter='$DriveLetter'"

现在，在C＃中，以下工作：

Now, in C#, the following works:

var a = new ManagementObject("Win32_LogicalDisk.DeviceID='D:'");            
Console.WriteLine(a.GetPropertyValue("VolumeSerialNumber").ToString());

但这不是

but this doesn't

var a = new ManagementObject("Win32_Volume.DriveLetter='D:'");            
Console.WriteLine(a.GetPropertyValue("DeviceID").ToString());

我得到

I get

Unhandled Exception: System.Management.ManagementException: Invalid object path

错误。



我做错了什么？



我尝试了什么：



我试过在管理员中运行Visual Studio模式，但这没有帮助。是通过构建查询字符串和使用ManagementObjectSearcher来查询Win32_Volume的唯一方法吗？我不能使用LINQ样式的扩展方法，可以使用Win32_LogicalDisk吗？

error.

What am I doing wrong?

What I have tried:

I have tried running Visual Studio in administrator mode, but that doesn't help. Is the only way to query Win32_Volume by building query strings and using ManagementObjectSearcher? Can't I do it using LINQ-style extension methods as can be done with Win32_LogicalDisk?

推荐答案

testdrv = Get-WmiObject -Class win32_volume -FilterDriveLetter ='

testdrv = Get-WmiObject -Class win32_volume -Filter "DriveLetter='

DriveLetter'

DriveLetter'"

现在，在C＃中，以下工作：

Now, in C#, the following works:

var a = new ManagementObject("Win32_LogicalDisk.DeviceID='D:'");            
Console.WriteLine(a.GetPropertyValue("VolumeSerialNumber").ToString());

但这不是

but this doesn't

var a = new ManagementObject("Win32_Volume.DriveLetter='D:'");            
Console.WriteLine(a.GetPropertyValue("DeviceID").ToString());

我得到

I get

Unhandled Exception: System.Management.ManagementException: Invalid object path

错误。



我做错了什么？



我尝试了什么：



我试过在管理员中运行Visual Studio模式，但这没有帮助。是通过构建查询字符串和使用ManagementObjectSearcher来查询Win32_Volume的唯一方法吗？我不能像使用Win32_LogicalDisk那样使用LINQ样式的扩展方法吗？

error.

What am I doing wrong?

What I have tried:

I have tried running Visual Studio in administrator mode, but that doesn't help. Is the only way to query Win32_Volume by building query strings and using ManagementObjectSearcher? Can't I do it using LINQ-style extension methods as can be done with Win32_LogicalDisk?

问题是您必须使用WQL查询来获取对象，这就是我使用的在我的测试中。



你提供的第一个例子是有效的，因为在Win32_LogicalDisk类中，DeviceID属性是一个Key。请参阅文档此处 [ ^ ]。



在Win32_Volume类中，DriveLetter不是Key字段，因此您无法使用路径语法重新使用创建ManagementObject来获取它。您必须使用WQL查询而不是ManagementObjectSearcher。

The problem is you have to use a WQL query to get at the object and that's what I used in my tests.

The first example you provided works because, on the Win32_LogicalDisk class, the DeviceID property is a Key. See the documentation here[^].

On the Win32_Volume class, DriveLetter is not a Key field so you cannot use the path syntax that you're using to create the ManagementObject to get at it. You must use a WQL query instead with the ManagementObjectSearcher.

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