Running Powershell in C# and Powershell is behaving differently

Question

The image shows the same powershell command executed in a C# and Powershell ISE. My question is, Powershell shows complete list of process and process directory, but the result of the code executed in C# does not contain windows processes like svchost.exe.

Of course, both my C# Form and Powershell ISE are running as Administrator. Also, I made sure to code my form to launch with administrative privileges. To be double sure, I executed my C# by right click - Run as Administrator (what I also did with Powershell ISE)

Command/s: Powershell and C#

get-process | get-item -erroraction silentlycontinue | format-table name, directory

get-process | format-table name, directory

Although this particular command shows all the process:

get-process

Unfortunately, combining it with the syntax above will show different output from C#.

private string RunScript(string script)
{

    Runspace runspace = RunspaceFactory.CreateRunspace();
    runspace.Open();
    Pipeline pipeline = runspace.CreatePipeline();
    pipeline.Commands.AddScript(script);
    pipeline.Commands.Add("Out-String");
    Collection<PSObject> results = pipeline.Invoke();
    runspace.Close();
    StringBuilder stringBuilder = new StringBuilder();
    foreach (PSObject pSObject in results)
        stringBuilder.AppendLine(pSObject.ToString());
    return stringBuilder.ToString();
}

private void button1_Click(object sender, EventArgs e)
{
    output.Clear();
    output.Text = RunFilePs1(input.Text);
}

Maybe you'd find out why if you removed -ErrorAction SilentlyContinue (don't forget to inspect pipeline.Error after execution) :) — Mathias R. Jessen
– Mathias R. Jessen, Commented Aug 12, 2020 at 11:35
I played with the command but the output is the same. -ErrorAction SilentlyContinue -This syntax only catch errors and does nothing with the code:( — Phoenix
– Phoenix, Commented Aug 12, 2020 at 11:39
Psychic debugging: your ISE is running as Administrator, your program is not. — Ian Kemp - SO dead by AI greed
– Ian Kemp - SO dead by AI greed, Commented Aug 12, 2020 at 11:51
Your ISE says it's running as administrator. Your C# process probably isn't. It will see different things — Chris F Carroll
– Chris F Carroll, Commented Aug 12, 2020 at 11:51

Michael Tucker · Accepted Answer · 2020-09-06 22:44:32Z

1

For some reason, Get-Process doesn't return the Path of some processes (probably the 64-bit ones) when running in 32-bit mode, so passing those to Get-Item fails to find anything.

You can see this by running your PS script from the x86 PS ISE.

So if you switch your C# Form to 64-bit, it will return all processes.

answered Sep 6, 2020 at 22:44

Michael Tucker

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