CODEWITHSUNDEEP
c#powershell
woolford
woolford

Reputation: 327

How to send a string parameter from c# to powershell?

I'm writing 2 apps one with c# and the other with powershell 1.0, in some point of my code I want to pass a string that indicating the server name from my c# app to a powershell script file that I wrote, how do I send it? and how do i accept it?

my code : 

RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
Runspace runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration);
runspace.Open();
RunspaceInvoke scriptInvoker = new RunspaceInvoke(runspace);

Pipeline pipeline = runspace.CreatePipeline();

String scriptfile = @"c:\test.ps1";

Command myCommand = new Command(scriptfile, false);
CommandParameter testParam = new CommandParameter("username", "serverName");

myCommand.Parameters.Add(testParam);


pipeline.Commands.Add(myCommand);
Collection<PSObject> psObjects;
psObjects = pipeline.Invoke();
runspace.Close();

and my powershell script 

param([string]$Username)

write-host $username

What am I missing? I'm kinda new with powershell.

Upvotes: 1

Views: 3473

Answers (1)

serialhobbyist
serialhobbyist

Reputation: 4815

I have machines with PowerShell 2.0 and 3.0 but not 1.0, so my results may differ. When I run your code on my PowerShell 3.0 box, I get:

A command that prompts the user failed because the host program or the command type does not support user interaction. Try a host program that supports user interaction, such as the Windows PowerShell Console or Windows PowerShell ISE, and remove prompt-related commands from command types that do not support user interaction, such as Windows PowerShell workflows.

It didn't like the Write-Host, so I changed your script to

param([string]$Username)

Get-Date
Get-ChildItem -Path $userName

Get-Date so that I could see some output without depending on the parameter and GCI to use the parameter. I modified your code to look like this:

RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
using (var runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration))
{
    runspace.Open();

    String scriptfile = @"..\..\..\test.ps1";
    String path = @"C:\Users\Public\";

    var pipeline = runspace.CreatePipeline();
    pipeline.Commands.Add(new Command("Set-ExecutionPolicy RemoteSigned -Scope Process", true));
    pipeline.Invoke();

    pipeline = runspace.CreatePipeline();
    var myCommand = new Command(scriptfile, false);
    var testParam = new CommandParameter("username", path);
    myCommand.Parameters.Add(testParam);
    pipeline.Commands.Add(myCommand);
    var psObjects = pipeline.Invoke();
    foreach (var obj in psObjects)
    {
        Console.WriteLine(obj.ToString());
    }
    runspace.Close();
}

Console.WriteLine("Press a key to continue...");
Console.ReadKey(true);

and it ran without error and displayed the folder contents, on both PoSh 2 and 3.

For info, if you're only setting the execution policy for the current process, you don't need to run elevated, hence I was able to do it in-code.

Upvotes: 1

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