Powershell how to create a delegate

Question

I am not to familar with powershell. I am trying to do something that would be a single line of code in C# but in powershell it is a pain :(

In the three lines below wow3 throws an error. Anyone know why wow3 throw a type not found error? Does this syntax for delegates only work for built in types?

$wow1 =[System.Action[int]]
$wow2 =[MyType]
$wow3 =[System.Action[MyType]]

Where is MyType defined? You likely need to load its assembly, or qualify it with a namespace. — Lance U. Matthews
– Lance U. Matthews, Commented Nov 8, 2013 at 1:11
$wow2 works though. why would wow2 work and not wow3? This is just example, in the actual script I put the full name — user1985513
– user1985513, Commented Nov 8, 2013 at 1:12
Will a ScriptBlock work? technet.microsoft.com/en-us/library/hh847893.aspx — Eris
– Eris, Commented Nov 8, 2013 at 2:59

Keith Hill · Accepted Answer · 2013-11-08 03:24:20Z

46

This line of PowerShell:

$wow1 = [System.Action[int]]

is equal to this line of C#:

var d = typeof(System.Action<int>);

That is, $wow1 contains a System.RuntimeType. Is that really what you are trying to do?

Perhaps you want something like this instead?

C:\PS> [Action[int]]$action = {param($i) Write-Host "i is $i"}
C:\PS> $action.Invoke(10)
i is 10

edited Nov 8, 2013 at 3:24

answered Nov 8, 2013 at 2:45

Keith Hill

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