In VBscript you can define a function using a ByRef argument like this :
Function CommentLine (ByRef arg)
In PowerShell you have to use the [ref] type to pass the reference of a variable instead of its value.
Here’s a example of how to define and call a function using a [ref] argument :
function CommentLine([ref]$arg) {
$arg.value = "# " + $arg.value
}
$Line="This should be a comment"
CommentLine ([ref]$Line)
$lineDon’t forget your passing the reference of the object, you have to use the value property of the reference to access the variable or object itself.
3 comments:
What about using 2 parameters?
function CommentLine([ref]$arg, $arg2)
None of the following versions will work:
1. CommentLine ([ref]$line, $line2)
2. CommentLine [ref]$line, $line2
In both cases the output is still "This should be a comment". (Doesn't matter what to do with $arg2 in the function)
Dear Anonymous,
When you pass a parameter as a reference it must be in an expression [between ()].
Here's a version of my function with 2 parameters :
function CommentLine2([ref]$arg, [ref]$arg2) {
$arg.value = "# " + $arg.value
$arg2.value = "# " + $arg2.value
}
$Line="This should be a comment"
$Line2 = "this is should be a comment too"
CommentLine2([ref]$Line)([ref]$line2)
$line
$Line2
Thank you very much! It helps me out a lot. Even I need multi-args function.
Post a Comment