How to add maximum looping in Powershell?

user_11076819 0
Viewed 74

I would like to mapping the network. I need to use retry if the mapping fail, and the maximum retry 5 times. I've tried this way, but I can't figure out how to add the maximum retry.

Do{
    Try{     
        $net = new-object -ComObject WScript.Network                   
        $net.MapNetworkDrive("$Directory", "\\IP\$Folder", $False, "$Server\$SQL", "$pass")
        $Message = "Mapping : " + $Directory + "Successful"
        Write-Host $Message
        
    }
    Catch{

         $Message= "Mapping : " + $Directory + " Fault" + " $_"
         Write-Host $Message
         # in here there is error handling.
         CallErrorHandlingFunction
    }
}While($? -ne $true)

# in here there is next process after network mapping  succesfull.
CallNextProcess

Anyone can help really appreciated. Thanks

retry-logic network-drive powershell loops
1 Answers

There are many ways to approach this, here is one using a script block, note that this example only works because you're using Write-Host which's outputs goes to the Information Stream and it's output is not captured unless redirected (6>&1).

$action = {
    Try
    {
        $net = New-Object -ComObject WScript.Network                   
        $net.MapNetworkDrive(
            "$Directory", "\\IP\$Folder", $False, "$Server\$SQL", "$pass"
        )
        $Message = "Mapping : " + $Directory + "Successful"
        Write-Host $Message
        $true # => if everything goes right $result = $true
    }
    Catch
    {
        $Message = "Mapping : " + $Directory + " Fault" + " $_"
        Write-Host $Message
        $false # => if fails $result = $false
    }
}

$maxRetries = 5

do { $result = & $action }             # do this
until (-not --$maxRetries -or $result) # until $result is True OR
                                       # $maxRetries reaches 0

Honestly a much easier alternative:

$maxRetries = 5

1..$maxRetries | ForEach-Object {
    if( & $action ) { break } # => if action = True stop the loop
}
user_153395440
Related