如何使用通过 a.Net PowerShell object 运行的 PowerShell 脚本获取 windows 注册表属性值？

Question

I am using the following PowerShell script to return information about apps installed on a PC:

Get-ChildItem "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall"

When I run this script in the Windows Powershell ISE, I see something like this for results:

 Hive: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall

Name Property

---- -------- Connection Manager SystemComponent: 1
DirectDrawEx
Docker Desktop DisplayIcon: C:\Program Files\Docker\Docker\Docker Desktop Installer.exe
DisplayName: Docker Desktop
DisplayVersion: 2.1.0.4
Version: 39773
InstallLocation: C:\Program Files\Docker\Docker
NoModify: 1
NoRepair: 1
Publisher: Docker Inc.
ChannelName: stable
ChannelUrl: https://download.docker.com/win/stable/appcast.xml
UninstallString: "C:\Program Files\Docker\Docker\Docker Desktop
Installer.exe" uninstall

I am calling the script from a C#.Net application as follows:

using (var ps = PowerShell.Create())
{
   ps.Runspace = p_runspace;
   ps.AddScript("Get-ChildItem ""HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall""");
   IEnumerable<PSObject> commandOutput = ps.Invoke();
}

How do I programmatically get access in C# to the properties returned when I run the script (Publisher, DisplayName, DisplayVersion) returned when I run the script in the ISE? I examined the properties on the PSObject in my app, they do not match up with the ISE.

Thanks, JohnB

Answer 1

Objects returned from PowerShell when invoked using PowerShell.Invoke() don't don't actually have all of the same members at the top level of the object, a bit of PowerShell "magic" makes it work that way from within a PowerShell session.

If you want a property value you need to inspect the Properties property of the returned PSObject :

foreach(PSObject obj in commandOutput) {
  Object val = obj.Properties['PropertyName'].Value
}

where PropertyName is the name of the property you want.