Functions/Check-StringNullOrEmpty.ps1
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<#
.SYNOPSIS Checks if string variable is null or empty. In case of switch GiveErrorIfEmpty there will be an error. .DESCRIPTION Checks if string variable is null or empty. In case of switch GiveErrorIfEmpty there will be an error. .EXAMPLE if (Check-StringNullOrEmpty -VariableName 'ProjectNo') {...} .EXAMPLE Check-StringNullOrEmpty -VariableName 'ItemNo' -GiveErrorIfEmpty .PARAMETER $VariableName The name of the variable to check. .PARAMETER GiveErrorIfEmpty Switch to determine if error must be given. #> function Check-StringNullOrEmpty { param ( [parameter(Mandatory=$true)] [string] $VariableName, [switch] $GiveErrorIfEmpty ) PROCESS { if ([string]::IsNullorEmpty((Get-Variable -Name $VariableName -ErrorAction SilentlyContinue).Value)) { if ($GiveErrorIfEmpty -eq $false) { return $true } else { Write-Error ("Variable '{0}' must be set." -f $VariableName) -ErrorAction Stop } } } } Export-ModuleMember -Function Check-StringNullOrEmpty |