Powershell Example: Try/Catch, ForEach, If/Else, Break/Continue, Write-Verbose/Warning/Host/Error

PsExample-5ad9fec0144ae4e0d0113de0b7cb626e.ps1

Clear-Host #Clearup the console.

### Script Output/Error Preferences.

#Enable/Disable Verbose Output for Debugging
$VerbosePreference = "Continue" #Use either Continue (Show) or SilentlyContinue (Hide)

#Stop Script Execution when an error occurs.
#Always use Stop!, if you need to bypass this behaviour for a specific command then use the -ErrorAction Parameter with SilentlyContinue for that command.
$ErrorActionPreference = "Stop" 

### Script Settings

#Declare Services to Stop, To throw a warning make a typo.
$Services = @("WinRM", "W32Time")



#Get-Date -Format "0" outputs the time as a universal time stamp
Write-Verbose "Script Started at $(Get-Date -format "O") under user $($env:USERDOMAIN)\$($env:USERNAME) on system $($env:COMPUTERNAME)" 


#Define $ServiceObjects as empty array in GlobalScope
$ServiceObjects = @()

# Service Retrieve Loop Start
Foreach ($Service in $Services) {

    Write-Verbose "Retrieving Service $($Service)"
    
    Try {

        #Add the ServiceObject to the $ServiceObjects array.
        $ServiceObjects += (Get-Service -Name $Service)
    }
    
    #To find the Exeption Name for a specific error examine the $Error variable after the error occured and note its place counting from 0
    #Then Use $Error[ErrorPosition].Exception.GetType().FullName to display the execption.
    Catch [Microsoft.PowerShell.Commands.ServiceCommandException] {

        #Some Exceptions are to generic, in this case you could use the Message Property of the Error Object to Narrow it down to a specific error.
        If ($_.Exception.Message -like "Cannot find any service with service name *" ) {

            Write-Warning "Service $($Service) does not exist, skipping."
            Continue #ForEach Loop wil start proccesing the Next Item.

        }

        Else {
            Write-Error -Message "Unknown Error, error message: $($Error[0].Exception.Message)"
            Break #ForEach Loop wil end
        }
    }
    
    Catch {
        Write-Error -Message "Unknown Error, error message: $($Error[0].Exception.Message)"
        Break #ForEach Loop wil end
    }

    #Only Runs when there is no Error (Break) or Warning (Continue)
    Write-Verbose "Service $($Service) retrieved succesfully"

} # Service Retrieve Loop End

#Calculate the amount of Services found
$ServiceObjects_Measure = $ServiceObjects | Measure-Object

#Console Message.
Write-Host "

$($ServiceObjects_Measure.Count) Service(s) has been found, see table below:"

#Output the ServiceObjects to the Console
$ServiceObjects | Format-Table | Out-String | Write-Host

Write-Verbose "Script Stopped at $(Get-Date -format "O")"

Use the following code if you want to output this in a HTML Mail Message or .HTML File for example.
$ServiceObjects_HTML = $ServiceObjects | Select-Object Status, Name, DisplayName | ConvertTo-Html -Fragment