如何检查是否已从c＃安装Windows QFE /修补程序？

How do I check that a Windows QFE/patch has been installed from c#?

在C＃中确定已安装给定QFE /补丁的最佳方法是什么？

使用WMI并检查Win32_QuickFixEngineering枚举。

从TechNet：

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strComputer ="."
Set objWMIService = GetObject("winmgmts:" _
&"{impersonationLevel=impersonate}!\\\" & strComputer &"\
oot\\cimv2")
Set colQuickFixes = objWMIService.ExecQuery _
("Select * from Win32_QuickFixEngineering")
For Each objQuickFix in colQuickFixes
Wscript.Echo"Computer:" & objQuickFix.CSName
Wscript.Echo"Description:" & objQuickFix.Description
Wscript.Echo"Hot Fix ID:" & objQuickFix.HotFixID
Wscript.Echo"Installation Date:" & objQuickFix.InstallDate
Wscript.Echo"Installed By:" & objQuickFix.InstalledBy
Next

HotFixID是您要检查的内容。

这是我系统上的输出：

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Hot Fix ID: KB941569
Description: Security Update for Windows XP (KB941569)
Hot Fix ID: KB937143-IE7
Description: Security Update for Windows Internet Explorer 7 (KB937143)
Hot Fix ID: KB938127-IE7
Description: Security Update for Windows Internet Explorer 7 (KB938127)
Hot Fix ID: KB939653-IE7
Description: Security Update for Windows Internet Explorer 7 (KB939653)
Hot Fix ID: KB942615-IE7
Description: Security Update for Windows Internet Explorer 7 (KB942615)
Hot Fix ID: KB944533-IE7
Description: Security Update for Windows Internet Explorer 7 (KB944533)
Hot Fix ID: KB947864-IE7
Description: Hotfix for Windows Internet Explorer 7 (KB947864)
Hot Fix ID: KB950759-IE7
Description: Security Update for Windows Internet Explorer 7 (KB950759)
Hot Fix ID: KB953838-IE7
Description: Security Update for Windows Internet Explorer 7 (KB953838)
Hot Fix ID: MSCompPackV1
Description: Microsoft Compression Client Pack 1.0 for Windows XP
Hot Fix ID: KB873339
Description: Windows XP Hotfix - KB873339
Hot Fix ID: KB885835
Description: Windows XP Hotfix - KB885835
Hot Fix ID: KB885836
Description: Windows XP Hotfix - KB885836
Hot Fix ID: KB886185
Description: Windows XP Hotfix - KB886185
Hot Fix ID: KB887472
Description: Windows XP Hotfix - KB887472
Hot Fix ID: KB888302
Description: Windows XP Hotfix - KB888302
Hot Fix ID: KB890046
Description: Security Update for Windows XP (KB890046)

最可靠的方法是确定哪些文件受QFE影响，并在每个文件上使用System.Diagnostics.FileVersionInfo.GetVersionInfo(path)并比较版本号。

编辑：我认为也有一种方法可以检查注册表中的卸载信息，但是如果QFE曾经成为Service Pack或汇总包的一部分，则可能会报告错误的否定信息