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Our WiX installer deploys a .NET 4.0 WinForms application to Windows Vista and 7 desktops. The application includes a Portable Class Library that requires a .NET patch (KB2468871). We need to install the patch as a prerequisite. There are various ways that the patch can be applied:
Using advice from a similar question, I created a CustomAction to check for the QFE (#1) that I demonstrated returns true when found.
private static bool IsPatchAlreadyInstalled()
{
// If the patch is installed, we can find it using WMI
var query = new SelectQuery("SELECT HotFixID FROM Win32_QuickFixEngineering WHERE HotFixID = 'Q2468871' OR HotFixID = 'KB2468871'");
var results = new ManagementObjectSearcher(query).Get();
return results.Count > 0;
}
Unfortunately, this fails on my dev machine as the patch was installed as part of the Tools (#2). I haven't witnessed situation #3 yet.
What is a better way to detect if the patch has been applied?
640
View the updates installed on your Server Core serverTo view updates by using Windows PowerShell, run Get-Hotfix. To view updates by running a command, run systeminfo.exe. There might be a short delay while the tool inspects your system. You can also run wmic qfe list from the command line.
If you're connected the internet, try to install the updates manually. Select Start > Settings > Update & Security > Windows Update , and then select Check for updates.
To check if a specific update is applied, follow these steps: Open Start menu. Go to Settings. Navigate to Update & Security > Windows Update.
Win32_QuickFixEngineering won't return all updates. Actually, it returns only updates restricted to QFE:
Updates supplied by Microsoft Windows Installer (MSI) or the Windows update site (http://update.microsoft.com) are not returned by Win32_QuickFixEngineering.
The update you're after is an MSI patch. Use Microsoft.Deployment.WindowsInstaller (aka DTF - Deployment Tools Foundation, part of the WiX toolset) to query the applied MSI patches:
public static bool IsPatchAlreadyInstalled(string productCode, string patchCode)
{
var patches =
PatchInstallation.GetPatches(null, productCode, null, UserContexts.Machine, PatchStates.Applied);
return patches.Any(patch => patch.DisplayName == patchCode);
}
In this case, KB2468871 is one of .NET Framework 4 updates. The following will return true if the updates have been applied on the machine:
IsPatchAlreadyInstalled("{F5B09CFD-F0B2-36AF-8DF4-1DF6B63FC7B4}", "KB2468871");// .NET Framework 4 Client Profile 64-bit
IsPatchAlreadyInstalled("{8E34682C-8118-31F1-BC4C-98CD9675E1C2}", "KB2468871");// .NET Framework 4 Extended 64-bit
IsPatchAlreadyInstalled("{3C3901C5-3455-3E0A-A214-0B093A5070A6}", "KB2468871");// .NET Framework 4 Client Profile 32-bit
IsPatchAlreadyInstalled("{0A0CADCF-78DA-33C4-A350-CD51849B9702}", "KB2468871");// .NET Framework 4 Extended 32-bit
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