How to compare a parameter while calling a function?

Question

Hello,
I have a powershell script with a function doing a switch process. While calling the function in the script I want to compare if the parameter is contained in the switch condition of the function.
function test{
[CmdletBinding()]
Param(
[Parameter(
Mandatory=$False,
ValueFromPipeline=$True,
ValueFromPipelineByPropertyName=$False
[string]$InputValue
$Param = switch($InputValue){
A {"string1,string2,string3"}
B {"string1,string2,string3"}
C {"string1,string2,string3"}
Return $Param}
If ((test($search)) -match ""){
$scrDynMSGArry = (test($search)).Split(",")
$NV = [PSCustomObject]@{
Param = $ParamString1 = $scrDynMSGArry[0]
String2 = $scrDynMSGArry[1]
String3 = $scrDynMSGArry[2]
Error message is: InvokeMethodOnNull for doing the split and reading the array.
I think there is a problem doing the comparison but have no idea to solve this.
Can anybody help?
Regards, Doreen

Answer 1

This appears to be what you are trying to do:
\_(ツ)_/
From how he is wording things, it sounds to me that if I pass $search the letter F, he wants to check to see if the switch statement contains a case for F, and if not do something. I do not think this can be done but he could always have a Default case,
returning something to indicate they need to choose something else, or the default parameters needed for whatever he is doing to work.
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Don't Retire Technet
She please ;-)
But clayman2 is right: $search can be F, G, ... but I want to use the function "test" only if its A,B or C.
I thought if $search is F it does not enter the if part beacause the condition is not true:
If ((test($search)) -match "")
You think thats not possible?
Would it be better to compare $search with my conditions (A, B or C are defined and known) for itself and then enter the function "test"? Can I have or conditions in the if part like
If ($search -eq "A"){$scrDynMSGArry = (test($search)).Split(",")
$NV = [PSCustomObject]@{
String1 = $scrDynMSGArry[0]
String2= $scrDynMSGArry[1]
String3= $scrDynMSGArry[2]
elseif ($search -eq "B"){$scrDynMSGArry = (test($search)).Split(",")
elseif ($search -eq "C"){$scrDynMSGArry = (test($search)).Split(",")