问将字符串转换为int以进行减法

EN

$fourCount = 0
$rowCount = 0
foreach($row in $ResultsTable){
  if ($row.'RowType' -eq 6) {
    if ($fourCount -gt 0) {
      #Sort-Object {$row.'CheckDate'} - descending
      $remainAmount = $currentAmount - $checkAmount
      $ResultsTable.Rows[$rowCount - 1].'Final' = $remainAmount
      $currentAmount = @()
      $fourCount = 0
      $remainAmount = 0
    }
    $checkAmount = [int]$row.'amount'
    $rowCount = $rowCount + 1
  } elseif ($row.'RowType' -eq 4) {
    if($row.'current'.Length -eq $NULL) {
      Continue
    } else {
      $currentAmount += [int]$row.'current'
      $rowCount = $rowCount + 1
      $fourCount++
    } 
  } else {
    Continue
  }
}