PowerShell Team

Automating the world one-liner at a time…

ScriptBlock - PowerShell Team

Get closure with GetNewClosure

March 27, 2009 Mar 27, 2009 03/27/09
PowerShell Team
Have you ever created scriptblocks on the fly, say in a foreach loop, and they totally mess up because they all have the same value? This is something sort of advanced, and typically used when you’re proxying an object. The most basic example would be, taken from (http://www.powershellcommunity.org/Forums/tabid/54/aff/1/aft/2506/afv/topic/...

Tied Variables in PowerShell

March 26, 2009 Mar 26, 2009 03/26/09
PowerShell Team
With Add-Type and $executioncontext you can add special varibles that have tied values. I made $random, and $now add-type @"using System;using System.Management.Automation;public class RandomVariable : PSVariable{Random r;public RandomVariable ()  : base("Random", 0, ScopedItemOptions.ReadOnly | ScopedItemOptions.AllScope)  {r = new...

Creating arbitrary delegates from scriptblocks in PowerShell…

July 25, 2006 Jul 25, 2006 07/25/06
PowerShell Team
People have been asking about creating arbitrary delegates out of scriptblocks. As Jeffrey has mentioned, this isn't directly supported in V1.0 of PowerShell. It is, however, possible to do it using dynamic methods and the CreateDelegate call. Here's a script (also attached) that will do it. I haven't tested this very much so it may not work ...

Casting a scriptblock to an arbitrary delegate signature

July 24, 2006 Jul 24, 2006 07/24/06
PowerShell Team
Arild asked the following in http://arildf.spaces.msn.com/blog/cns!E99F8B43533149B0!140.entry?_c%3dBlogPart : PSMDTAG:FAQ: Delegates - how to cast a scriptblock to an arbitrary delegate signature? ANSWER - You can't in V1.0. In version 1.0 Windows PowerShell only supports casting scriptblocks to delegates with the ...