Powershell Try Catch and retry?

loops powershell try-catch finally
IIIdefconIII picture IIIdefconIII · Jun 12, 2017 · Viewed 8.3k times · Source

I have this script

#Change hostname
[void][System.Reflection.Assembly]::LoadWithPartialName('Microsoft.VisualBasic') 
Write-Host "Change hostname " -NoNewLine
$ComputerName = [Microsoft.VisualBasic.Interaction]::InputBox('Insert the desired computername:', 'Change hostname') 
Write-Host "- DONE" -ForegroundColor DarkGreen -BackgroundColor green -NoNewline
Write-Host " hostname = $ComputerName "
Rename-Computer -NewName $ComputerName

when the computer name gets spaces, it fails cause a hostname cant have spaces. Can i block the form to have any spaces or does anyone knows how to get back to the inputbox when a error has been created for a re-try

Answer

colsw picture colsw · Jun 12, 2017 
do {
    $ComputerName = [Microsoft.VisualBasic.Interaction]::InputBox('Insert the desired computername:','Change hostname')
} while ($ComputerName -match "\s")

using a do{}while() loop and checking the Input doesn't have any whitespace should resolve your issue, this will re-prompt until a valid hostname is input, if you want to check for any errors at all:

do{
    $Failed = $false
    Try{
        $ComputerName = [Microsoft.VisualBasic.Interaction]::InputBox('Insert the desired computername:', 'Change hostname') 
        Write-Host "- DONE" -ForegroundColor DarkGreen -BackgroundColor green -NoNewline
        Write-Host " hostname = $ComputerName "
        Rename-Computer -NewName $ComputerName -ErrorAction Stop
    } catch { $Failed = $true }
} while ($Failed)

Related questions

How to loop through a dataset in powershell?

I am trying a "very" simple task to output values of each rows from a DataSet : for ($i=0;$i -le $ds.Tables[1].Rows.Count;$i++) { Write-Host 'value is : ' + $i + ' ' + $ds.Tables[1].Rows[$i][0] } gives output ... value is : +0+ +…

Read More
For-each over an array in JavaScript

How can I loop through all the entries in an array using JavaScript? I thought it was something like this: forEach(instance in theArray) Where theArray is my array, but this seems to be incorrect.

Read More
Loop through an array in JavaScript

In Java you can use a for loop to traverse objects in an array as follows: String[] myStringArray = {"Hello", "World"}; for (String s : myStringArray) { // Do something } Can you do the same in JavaScript?

Read More