Creating arbitrary delegates from scriptblocks in PowerShell...

Interesting Finds: July 25, 2007

Jason Haley — Wed, 26 Jul 2006 06:10:56 GMT

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Scott Yost — Wed, 26 Jul 2006 10:09:17 GMT

The example worked great for me, but when I tried to make my own System.Net.Security.RemoteCertificateValidationCallback , it gets created okay but fails with "Invalid class token" whenever the delegate is invoked.

re: Creating arbitrary delegates from scriptblocks in PowerShell...

PowerShellTeam — Thu, 27 Jul 2006 00:00:41 GMT

I missed the type argument to the box instruction which was causing this problem. The script has been updated. I tried it with your example and it seems to work properly now.

-bruce

Bruce Payette [MSFT]
PowerShell Tech Lead

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Scott Yost — Thu, 27 Jul 2006 07:40:28 GMT

Thank you - works great now!

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Johnl — Mon, 31 Jul 2006 22:21:35 GMT

Sorry if this is slightly off-topic, but I was wondering where we could submit requests for articles?

I'd very much like to see an article about creating dynamic types (I belive this involves the add-noteproperty function?).

Thanks, and keep up the good work

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Jeffrey Snover — Tue, 01 Aug 2006 00:03:18 GMT

> I was wondering where we could submit requests for articles?

We read all the comments so feel free to post a request here.

Jeffrey Snover [MSFT]
Windows PowerShell/Aspen Architect
Visit the Windows PowerShell Team blog at: http://blogs.msdn.com/PowerShell
Visit the Windows PowerShell ScriptCenter at: http://www.microsoft.com/technet/scriptcenter/hubs/msh.mspx

A templating engine using PowerShell expressions

Serge van den Oever [Macaw] — Sun, 31 Dec 2006 04:40:24 GMT

While working on our Software Factory for SharePoint 2007 solutions I needed to do some simple template

re: Creating arbitrary delegates from scriptblocks in PowerShell...

svdoever — Sun, 31 Dec 2006 04:57:58 GMT

Thanks for your great code, you saved my day! I used it to create a simple template engine with PowerShell expression expansion. Have a look at http://blogs.msdn.com/powershell/archive/2006/07/25/678259.aspx

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Stefan Koell — Mon, 14 May 2007 19:26:20 GMT

Hi,

can someone explain how this works exactly. I need to create a SSLStream and must provide a callback method in the constructor and I really cannot find out how to use your example to do that. Can you provide some detailed instructions?

cheers

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Omid — Tue, 29 May 2007 07:22:13 GMT

Is it possible to pass a powershell function as a delegate parameter to a .NET method?

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Pangos — Tue, 03 Jul 2007 23:17:22 GMT

You updated the script on the page, but not in the attachment. If you use this utility, be sure to use version on the Blog page.

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Colin Bowern — Tue, 11 Dec 2007 15:36:55 GMT

I'm trying to create a Predicate using this method but the result isn't correct:

$domains = New-Object "System.Collections.Generic.List``1[System.String]";

$domains.Add("foo.com");

$uri = New-Object System.Uri("http://bar.com");

$delegate = get-delegate "System.Predicate``1[System.String]" { Write-Host $uri.Host " : " $args " = " ([String]::Compare($uri.Host, $args[0], $true) -eq 0); return ([String]::Compare($uri.Host, $args[0], $true) -eq 0); };

$domains.Exists($delegate);

The call to Exists returns true even though bar.com isn't in the collection.

Thoughts on how where I'm going wrong?

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Yuhong Bao — Wed, 19 Dec 2007 05:31:53 GMT

Can you use this to create a thread using PowerShell?

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Richard — Sun, 06 Jan 2008 16:17:46 GMT

Cool script, but crashs PowerShell with the following:

PS E:\> $d = &get-delegate System.Threading.WaitCallback `

>> {

>> echo $args[0]

>> }

PS E:\> [System.Threading.ThreadPool]::QueueUserWorkItem ($d, "test")

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Nikolaus Rollinger — Wed, 20 Feb 2008 21:02:46 GMT

I've detected the same problem as already posted by Colin Bowern.

Is this not important enough to give it your attention?

Hey, Jeff and Bruce, give it the necessary attention, please. Don't forget we are your customers!

I hope this helps!

Thank you.

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Brian Peiris — Tue, 15 Apr 2008 10:01:23 GMT

I'd like to see a solution to Colin's problem myself. I've been trying to solve it for a while now, but the IL is over my head.

xion.log » Triki z PowerShellem #1

xion.log » Triki z PowerShellem #1 — Thu, 15 May 2008 15:41:06 GMT

PingBack from http://xion.org.pl/2008/05/15/triki-z-powershellem-1/

DynamicMethod revisited: Making Powershell handle arbitrary delegates | Developer Home

Fri, 23 May 2008 01:23:16 GMT

PingBack from http://www.wowgoldip.com/2008/05/22/dynamicmethod-revisited-making-powershell-handle-arbitrary-delegates/

re: Creating arbitrary delegates from scriptblocks in PowerShell...

Serge van den Oever — Wed, 18 Nov 2009 00:05:39 GMT

This code breaks on PowerShell 2. Are arbitrary delegates supported by PowerShell 2.0 out of the box?