Unable to call a Powershell function from C#

Question

C# Code: The C# code is unable to call the function Trial2 which is present in the powershell script although it is being executed before.

    StringBuilder sb = new StringBuilder();
    PowerShell psExec = PowerShell.Create();
    psExec.AddScript(@ "C:\Users...\sc.ps1");
    psExec.AddCommand("Trial2").AddParameter("a", "Ram");
    Collection < PSObject > results;
    Collection < ErrorRecord > errors;
    results = psExec.Invoke();
    errors = psExec.Streams.Error.ReadAll();
    if (errors.Count > 0) {
        foreach(ErrorRecord error in errors) {
            sb.AppendLine(error.ToString());
        }
    } else {
        foreach(PSObject result in results) {
            sb.AppendLine(result.ToString());
        }
    }
    Console.WriteLine(sb.ToString());

Powershell Script:

function Trial2($a){
    "Yes! $a";
}

Error I get:

I have Set-ExecutionPolicy to Unrestricted in the Powershell as well.

Thanks in advance!

You could try "Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope LocalMachine"...it'll apply to all users and when running with no profile — Ctznkane525
– Ctznkane525, Commented Jun 15, 2021 at 12:18
Change psExec.AddScript("Set-ExecutionPolicy") to psExec.AddCommand("Set-ExecutionPolicy"), and then call AddStatement() before calling AddScript(...) on the next line. — Mathias R. Jessen
– Mathias R. Jessen, Commented Jun 15, 2021 at 12:19
Does this answer your question? PowerShell says "execution of scripts is disabled on this system." — ba-a-aton
– ba-a-aton, Commented Jun 15, 2021 at 12:27
Change psExec.AddScript(@"C:\Users...\sc.ps1") to psExec.AddScript(@ ". 'C:\Users...\sc.ps1'") (notice the leading .) - this will dot-source the script as opposed to just executing it in itw own scope — Mathias R. Jessen
– Mathias R. Jessen, Commented Jun 15, 2021 at 12:43

mklement0 · Accepted Answer · 2021-06-28 13:26:01Z

Mathias R. Jessen has provided all the necessary pointers in his comments, but let me put it all together:

PowerShell psExec = PowerShell.Create();

// Add a script block that dot-sources (.) your .ps1 file,
// which in turn defines the Trial2 function.
psExec.AddScript(@". C:\Users...\sc.ps1");

// Start a new statement to ensure that the dot-sourcing is performed
// before additional commands are executed.
psExec.AddStatement();

// Now you can add a command that calls your Trial2 function.
psExec.AddCommand("Trial2").AddParameter("a", "Ram");

// ...

Note that the API is fluent, so you could use a single statement; the following demonstrates this, and also shows how to set the execution policy directly via the API rather than by submitting a Set-ExecutionPolicy command, as you originally attempted:

// Create an initial default session state.
var iss = System.Management.Automation.Runspaces.InitialSessionState.CreateDefault2();
// Set its script-file execution policy.
iss.ExecutionPolicy = Microsoft.PowerShell.ExecutionPolicy.Bypass;

// Create a PowerShell instance with a runspace based on the 
// initial session state.
PowerShell psExec = PowerShell.Create(iss);

psExec
  .AddScript(@". C:\Users...\sc.ps1")
  .AddStatement()
  .AddCommand("Trial2").AddParameter("a", "Ram");

// ...

Note that setting the execution policy this way is the equivalent of setting it with
Set-ExecutionPolicy -Scope Process. This means that it'll stay in effect for all PowerShell sessions started from the current process.

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