CODEWITHSUNDEEP
powershell
Jack128
Jack128

Reputation: 1173

how to pass "Type" argument in function?

I have 2 pieces of code:

# code 1:
[type]$t1 = [switch] 
# all is ok, code works as expected

#code 2:
function test ([type]$t2) {  }
test -t2 [switch]
# here we get error. can't convert from string to system.type

I know, I can write: test -t2 "System.Management.Automation.SwitchParameter", but it's ugly!! Why can i set [switch] to [type]variable, but can't pass it to function??

Upvotes: 2

Views: 5185

Answers (3)

Aaron Jensen
Aaron Jensen

Reputation: 26749

Wrap the argument to the test function as an expression and it will return the type:

function test ([type]$t2) {  }
test -t2 ([switch])

Upvotes: 2

Shay Levy
Shay Levy

Reputation: 126732

PowerShell lets you can create types with a cast:

PS> [type]"switch"

IsPublic IsSerial Name                                     BaseType
-------- -------- ----                                     --------
True     False    SwitchParameter                          System.ValueType

What you're actually doing is passing the type name enclosed in brackets:

PS> [type]"[switch]"
Cannot convert the "[switch]" value of type "System.String" to type "System.Type".

So you need to pass just the name of the type:

test -t2 switch

or

test -t2 ([switch].fullname)

Upvotes: 4

manojlds
manojlds

Reputation: 301147

You can do this:

test -t2 "switch"

Or you can use the example from code1 and pass in the $t1 itself:

function test ([type]$t2) {  }
[type]$t1 = [switch] 
test -t2 $t1

Upvotes: 3

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