Executing Powershell script containing Commandlets

Question

I need to execute Powershell script containing my custom Commandlets ( exist in different assembly) from C#. I tried following approach but it just invokes the commandlet only once and that's it, while in the script that commandlet is written more than once.

Get-MyParameter myTasks

Start-Process notepad.exe

Get-MyParameter myTasks
Get-MyParameter myTasks
Get-MyParameter myTasks

While, MyParameter is written in different assembly. Tried Code is :

var powerShellInstance = PowerShell.Create();
powerShellInstance.Runspace = runSpace;

var command = new Command("Import-Module");

command.Parameters.Add("Assembly", Assembly.LoadFrom(@"..\CommandLets\bin\Debug\Commandlets.dll"));

powerShellInstance.Commands.AddCommand(command);
powerShellInstance.Invoke();

powerShellInstance.Commands.Clear();    
powerShellInstance.Commands.AddCommand(new Command("Get-MyParameter"));             

powerShellInstance.AddScript(psScript);

var result = powerShellInstance.Invoke();

What am I doing wrong here?

Answer 1

You are adding the script to the same pipeline you added the Get-MyParameter command to. In effect, you are doing

get-myparameter | { … your script … }

Try using separate pipelines instead.

var result1 = powerShellInstance.AddCommand("Get-MyParameter").Invoke()
var result2 = powerShellInstance.AddScript(psScript).Invoke();

Also, you can simplify your module loading code to

powerShellInstance.AddCommand("Import-Module").
    AddParameter("Name", @"..\CommandLets\bin\Debug\Commandlets.dll")).
        Invoke();