Shahar Gvirtz's Weblog

How to run PowerShell script from command-let

Sometimes, we want to run PowerShell script from command-let that derives from PSCmdlet (If you derived from Cmdlet, you can't use this way).
To do so, we just have to use this code:

   1:  using System.Management.Automation;

   2:  using System.Collections.ObjectModel;

   3:   

   4:  ......

   5:   

   6:  Collection<PSObject> results = InvokeCommand.InvokeScript("dir" /*replace it with your script */);

   7:  foreach (PSObject var in results)

   8:  {

   9:         WriteObject(var.ToString(),false);

  10:  }

I included in this code the important using statements, and the code itself. Few things about this code:

1. I use PSObject as the type for the collection, which means that I can access any property and method of the returning object, include Extended methods (ETS).
2. Always use WriteObject method in Command-lets NEVER use System.Console.
   That's because WriteObject write stream of object, not text, which is one of the biggest advantages in PowerShell - we can work with object instead text.
   When you use WriteObject you can be sure that any PowerShell host will be able to use the command-let and the output easily.

Shahar.