Have Powershell process a list of objects from a C# program

Question

I want to add a facility in a c# application where i can:

1) Take a collection of objects, and pass it to a powershell script from inside my c# application

2) Have the powershell script make changes to the the list of objects it was passed

3) Return that list of objects back to c#

I have an external class called Message

 public class Message 
    { 
        public String name { get; set; } 
        public String from { get; set; } 
        public String to { get; set; } 
        public String date { get; set; } 
        public String subject { get; set; } 
        public String body { get; set; } 
    }

I populate the PSDataCollection list class as such:

 PSDataCollection<Message> mlist = new PSDataCollection<Message>() 
          { 
              new Message {  to="user1", from="user2", date = "1/10/2010 12:00:00 AM EST", subject = "hi there" , body = "hi again" }, 
              new Message {  to="user1", from="user3", date = "1/10/2010 12:00:00 AM EST", subject = "new messages" , body = "new messages" } 
          }

In the powershell script we want it to 1) Read each object 2) Adjust the date field by adding 2 hours to it

Implementation issues:

The following code is our attempt at getting it working. The first issue we hit was how to import the Message class from an external DLL.

We tried this: Add-Type "G:\testBAL\bin\Debug\testBAL.dll" but got errors

Any help would be appreciated.

namespace TestProject 
{ 
    class Program 
    { 
      static void Main(string[] args) 
        { 
            PSDataCollection<Message> mlist = new PSDataCollection<Message>() 
            { 
                new Message {  to="user1", from="user2", date = "1/10/2010 12:00:00 AM EST", subject = "hi there" , body = "hi again" }, 
                new Message {  to="user1", from="user3", date = "1/10/2010 12:00:00 AM EST", subject = "new messages" , body = "new messages" } 
            }; 
            mlist.Complete(); 

            PowerShell ps = PowerShell.Create() 
                .AddScript("Add-Type G:\testBAL\bin\Debug\testBAL.dll") 
                .AddCommand("Select-Object"); 

            IAsyncResult async = ps.BeginInvoke<Message>(mlist); 

            foreach(PSObject result in ps.EndInvoke(async)) 
            { 
                String to = ((Message)(result.BaseObject)).to; 
                Console.WriteLine("to=" + to); 
            } 
        } 
    } 
}

Doug Finke · Accepted Answer · 2011-03-29 23:26:21Z

You can use a PowerShell Runspace to Set and Get variables in a PowerShell Session created in a .NET application. I edited your date parameter and removed the EST so it could be easily be parsed by PowerShell's Get-Date cmdlet.

HTH

Doug

var mlist = new PSDataCollection<Message>() 
{ 
    new Message {  to="user1", from="user2", date = "1/10/2010 12:00:00 AM", subject = "hi there" , body = "hi again" }, 
    new Message {  to="user1", from="user3", date = "1/10/2010 12:00:00 AM", subject = "new messages" , body = "new messages" } 
};

var rs = RunspaceFactory.CreateRunspace();
rs.Open();
rs.SessionStateProxy.SetVariable("list", mlist);
var ps = PowerShell.Create();
ps.Runspace = rs;

ps.AddScript(@"
    $list | ForEach {
        $_.date = (Get-Date($_.date)).AddHours(2)
    }   
");

ps.Invoke();

var result = rs.SessionStateProxy.GetVariable("list") as PSDataCollection<Message>;
foreach (var item in result)
{
    Console.WriteLine(item.date);
}
rs.Close();

Naraen · Accepted Answer · 2011-03-29 21:33:07Z

0

From your description it appears you are missing the -Path switch.

You have to specify the -Path when you pass a DLL directly. See reference documentation here ... http://technet.microsoft.com/en-us/library/dd315241.aspx

answered Mar 29, 2011 at 21:33

Naraen

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Comments

John Rutherford · Accepted Answer · 2011-03-29 21:43:12Z

0

I've loaded a C# assembly into a PowerShell script and used it like this:

$dllPath = "C:\path\library.dll"
$tmp = [Reflection.Assembly]::LoadFile($dllPath)
$obj = new-object Namespace.LibraryClass()

answered Mar 29, 2011 at 21:43

John Rutherford

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