PowerShell Pass Named parameters to ArgumentList

Question

I have a PowerShell script that accepts 3 named parameters. Please let me know how to pass the same from command line. I tried below code but same is not working. It assigns the

Answer 1

The code by mjolinor works great, but it took me several minutes to understand it.

The code makes a simple thing - generates a content of script block with built-in parameters:

&{
    Param (
        [string]$P3,
        [string]$P2,
        [string]$P1
    )
    Write-Output "P1 Value:" $P1
    Write-Output "P2 Value:" $P2
    Write-Output "P3 Value:" $P3
} -P1 1 -P2 2 -P3 3

Then this script block is passed to Invoke-Command.

To simplify the code:

".{$(get-content $ScriptPath -Raw)} $(&{$args} @params)"

$scriptContent = Get-Content $ScriptPath -Raw
$formattedParams = &{ $args } @params
# The `.{}` statement could be replaced with `&{}` here, because we don't need to persist variables after script call.
$scriptBlockContent = ".{ $scriptContent } $formattedParams"
$sb = [scriptblock]::create($scriptBlockContent)

Let's make a basic C# implementation:

void Run()
{
    var parameters = new Dictionary
    {
        ["P1"] = "1",
        ["P2"] = "2",
        ["P3"] = "3"
    };

    var scriptResult = InvokeScript("Test.ps1", "server", parameters)
    Console.WriteLine(scriptResult);
}

string InvokeScript(string filePath, string computerName, Dictionary parameters)
{
    var innerScriptContent = File.ReadAllText(filePath);
    var formattedParams = string.Join(" ", parameters.Select(p => $"-{p.Key} {p.Value}"));
    var scriptContent = "$sb = { &{ " + innerScriptContent + " } " + formattedParams + " }\n" +
        $"Invoke-Command -ComputerName {computerName} -ScriptBlock $sb";

    var tempFile = Path.Combine(Path.GetTempPath(), Guid.NewGuid() + ".ps1");
    File.WriteAllText(tempFile, scriptContent);

    var psi = new ProcessStartInfo
        {
            FileName = "powershell",
            Arguments = $@"-ExecutionPolicy Bypass -File ""{tempFile}""",
            RedirectStandardOutput = true,
            UseShellExecute = false
        };

    var process = Process.Start(psi);
    var responseText = process.StandardOutput.ReadToEnd();

    File.Delete(tempFile);

    return responseText;
}

The code generates a temporary script and executes it.

Example script:

$sb = {
    &{
        Param (
            [string]$P3,
            [string]$P2,
            [string]$P1
        )
        Write-Output "P1 Value:" $P1
        Write-Output "P2 Value:" $P2
        Write-Output "P3 Value:" $P3
     } -P1 1 -P2 2 -P3 3
}
Invoke-Command -ComputerName server -ScriptBlock $sb