PowerShell Pass Named parameters to ArgumentList - powershell

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 entire value to P3 only. My requirement is that P1 should contain 1, P2 should 2 and P3 should be assigned 3.
Invoke-Command -ComputerName server -FilePath "D:\test.ps1" -ArgumentList {-P1 1 -P2 2 -P3 3}
Ihe below is script file code.
Param (
[string]$P3,
[string]$P2,
[string]$P1
)
Write-Output "P1 Value :" $P1
Write-Output "P2 Value:" $P2
Write-Output "P3 Value :" $P3

Answer 1

One option:
$params = #{
P1 = 1
P2 = 2
P3 = 3
}
$ScriptPath = 'D:\Test.ps1'
$sb = [scriptblock]::create(".{$(get-content $ScriptPath -Raw)} $(&{$args} #params)")
Invoke-Command -ComputerName server -ScriptBlock $sb

Answer 2

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<string, string>
{
["P1"] = "1",
["P2"] = "2",
["P3"] = "3"
};
var scriptResult = InvokeScript("Test.ps1", "server", parameters)
Console.WriteLine(scriptResult);
}
string InvokeScript(string filePath, string computerName, Dictionary<string, string> 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

Answer 3

Here's a simple solution:
[PowerShell]::Create().AddCommand('D:\test.ps1').AddParameters(#{ P1 = 1; P2 = 2; P3 = 3 }).Invoke()
Here's output:
PS C:\Windows\system32> [PowerShell]::Create().AddCommand('D:\test.ps1').AddParameters(#{ P1 = 1; P2 = 2; P3 = 3 }).Invoke()
P1 Value :
1
P2 Value:
2
P3 Value :
3

Answer 4

If you are trying to use the -FilePath with named parameters (-P1 1 -P2 2), then I found this will work. Use a script block to run the file, instead of the using -FilePath.
Invoke-Command -ComputerName server -ScriptBlock {& "D:\test.ps1" -P1 1 -P2 2 -P3 3}

Answer 5

Use a hashtable :
icm -ComputerName test -ScriptBlock{$args} -ArgumentList #{"p1"=1;"p2"=2;"p3"=3}

Answer 6

Use a hashtable, indeed!
#TestPs1.ps1
Param (
[string]$P3,
[string]$P2,
[string]$P1
)
Write-Output "P1 Value :" $P1
Write-Output "P2 Value:" $P2
Write-Output "P3 Value :" $P3
$params = #{
P3 = 3
P2 = 2
}
#(just to prove it doesn't matter which order you put them in)
$params["P1"] = 1;
#Trhough the use of the "Splat" operator, we can add parameters directly onto the module
& ".\TestPs1.ps1" #params
outputs:
P1 Value :
1
P2 Value:
2
P3 Value :
3

Answer 7

If you're willing to skip Invoke-Command altogether...
Your script could look like this:
([string]$args).split('-') | %{
if ($_.Split(' ')[0].ToUpper() -eq "P1") { $P1 = $_.Split(' ')[1] }
elseif ($_.Split(' ')[0].ToUpper() -eq "P2") { $P2 = $_.Split(' ')[1] }
elseif ($_.Split(' ')[0].ToUpper() -eq "P3") { $P3 = $_.Split(' ')[1] }
}
Write-Output "P1 Value :" $P1
Write-Output "P2 Value :" $P2
Write-Output "P3 Value :" $P3
And you would call it like this:
D:\test.ps1 -P1 1 -P2 2 -P3 3