CreatePerformanceCounter.ps1

# Perfmon Name and Help
$categoryName = "MyAppPerformance"
$categoryHelp = "MyApp"
$categoryType = [System.Diagnostics.PerformanceCounterCategoryType]::MultiInstance

# Fix it by Index
$counterName = "Count", "Time"
$counterType = "NumberOfItems32", "NumberOfItems32"
$counterHelp = "Count", "Time"

# Delete Existing Category
$categoryCount = ([System.Diagnostics.PerformanceCounterCategory]::GetCategories() | where CategoryName -eq $categoryName).Count
If ($categoryCount -ne 0){ [System.Diagnostics.PerformanceCounterCategory]::Delete($categoryName) }

# Create Collection
$objCCDC = New-Object System.Diagnostics.CounterCreationDataCollection
0..($counterName.count -1) `
| %{
    $objCCD = New-Object System.Diagnostics.CounterCreationData
    $objCCD.CounterName = $counterName[$_]
    $objCCD.CounterType = $counterType[$_]
    $objCCD.CounterHelp = $counterHelp[$_]
    $objCCDC.Add($objCCD) > $null
}
$objCCDC | Format-Table -AutoSize | Out-String | %{[Console]::WriteLine($_)}

# Perfmon Execute
[System.Diagnostics.PerformanceCounterCategory]::Create($categoryName, $categoryHelp, $categoryType, $objCCDC) | Out-String | %{[Console]::WriteLine($_)}