FunctionGivingErrorWhileTryingCall

Question

I want to open some of the processes with the help of function, But I saw below warning which I am not quite sure, Please assist
and Also what I should do to use this function every time when I log in ISE ( not only for current session, I need for all sessions )

Please help

Answer 1

Hi there,

There are many ways to handle errors in Windows PowerShell, including:

$Error.Clear(); Do-Something; If ($Error) {..} Else {..}
Trap
$ErrorActionPreference

Trap blocks generally catch any errors in the scope of the entire script or function. The beauty of Try, Catch, Finally is that it is like a localized Trap for a specific block of commands. This gives you great flexibility in your error handling.

Here are some links to help you out

Using Try, Catch, Finally Blocks for PowerShell Error Handling
https://devblogs.microsoft.com/scripting/weekend-scripter-using-try-catch-finally-blocks-for-powershell-error-handling/

Handling Errors the PowerShell Way
https://devblogs.microsoft.com/scripting/handling-errors-the-powershell-way/

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Answer 2

You should start by downloading and reviewing this document.

https://www.sapien.com/books_training/Windows-PowerShell-4

Powershell can use positional parameters or named parameters.

function TestPosition ($ProcessName,$SomethingElse) {
    Write-Host ""
    Write-Host "You asked me to look for $ProcessName." 
    Write-Host "And do something with $SomethingElse." 
    Get-Process $ProcessName
}
function TestNamed {param (
        [string]$ProcessName = "",
        [string]$SomethingElse = ""
    )
    Write-Host ""
    Write-Host "You asked me to look for $ProcessName." 
    Write-Host "And do something with $SomethingElse." 
    Get-Process $ProcessName

}
TestPosition "notepad" "foo"
TestNamed -SomethingElse "XXXXXX" -ProcessName "Powershell"