Powershell check types of int and double

Question

I need the user to fill in an integer, but with the code shown beneath, also doubles are allowed. How can I change it to allow only integers?

do{

    $opgegevenGetal = read-host "Enter an integer"

    if(![bool]($opgegevenGetal -as [int])){
        write-host "Only integers please"
    }

}

until ([bool]($opgegevenGetal -as [int]))

Answer 1

try:

do{
    $opgegevenGetal = read-host "Enter an integer"
    $a = ""
    if(  ![int32]::TryParse( $opgegevenGetal , [ref]$a ))
      {
        write-host "Only integers please"
      }
  } until ($a -gt 0)

Codes for accept 0 as input:

do{
    $opgegevenGetal = read-host "Enter an integer"
    $a = ""
    if(  ![int32]::TryParse( $opgegevenGetal , [ref]$a ))
      {
        write-host "Only integers please"
      }
  } until ($a -gt 0 -or $opgegevenGetal -eq '0')

or:

do{
    $opgegevenGetal = read-host "Enter an integer"
    $a = ""
    $b = [int32]::TryParse( $opgegevenGetal , [ref]$a )
    if(  !$b)
      {
        write-host "Only integers please"
      }
  } until ($b)

Answer 2

A little more compact version of Christian's answer:

$value = 0
$read = Read-Host 'Enter an integer'
while( ![int]::TryParse( $read, [ref]$value ) ) {
  $read = Read-Host 'Only integers please'
}