How to Pass typed delegate to .Net code from Powershell

Question

I'm attempting to convert a C# method to .Net code and I'm having some trouble. Here's the C# line

text = Regex.Replace(text, "{{(.+?)}}", new MatchEvaluator(match => values[match.Groups[1].Value].ToString()));

My first attempt looks like so:

$text = New-Object System.Text.RegularExpressions.MatchEvaluator -ArgumentList @({$values[$args[0].Groups[1].Value].ToString()})

I obviously don't understand how to create delegates in Powershell, and I've been googling for the past hour. Everything I come across seems to fail, so I'm sure I have a fundamental misunderstanding of what's going on. I know MatchEvaluator is itself a delegate type and I think the issue is I don't know how to create delegates from powershell scriptblocks. I keep getting exceptions complaining the method paramenter is null, but I know for a fact that what I'm passing to it isn't null, so I'm lost.

Can anyone help out here?

user4003407 · Accepted Answer · 2015-05-01 00:17:22Z

3

You can create delegate by casting to delegate type:

$Delegate=[System.Text.RegularExpressions.MatchEvaluator]{$values[$args[0].Groups[1].Value].ToString()}

But in many cases you can just pass ScriptBlock into method:

$text=[Regex]::Replace($text, "{{(.+?)}}", {$values[$args[0].Groups[1].Value].ToString()})

answered May 1, 2015 at 0:17

user4003407

22.3k4 gold badges54 silver badges62 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to Pass typed delegate to .Net code from Powershell

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related