v2.0 mass string replace

##V2 is all about using the string builder method instead
<#
2. Load the initial string into a System.Text.StringBuilder and manipulate the string inside it. StringBuilders are mutable; so, this should be faster. (e.g.
$sb = New-Object System.Text.StringBuilder((C:\Path\MyFile.xml | Out-String))
And then manipulate that with it's .Replace() method.
#>

Function Update-OCSXMLv2 {
param(
    $BuddyListFile = "A:\AsiaContactsExport.xml",
    $NameMatchingFile= "C:\Users\sowen\Dropbox\Docs\Foxdeploy\contoso\contoso - Source Disabled Users with OCS Accounts - Disable OCS - 20141002.csv",
    $OutFile = ("A:\temp\" + (get-date -UFormat %Y%m%d_%H%M) + "_UpdatedOSCSXML.xml")
)

    begin{
        $i=0
        Write-host "Importing contents of `$BuddyListFile......" -NoNewline
        #original $FileInMemory = Get-Content $BuddyListFile

        $FileInMemory = New-Object System.Text.StringBuilder((Get-Content $BuddyListFile | out-string))

        Write-host "[OK]" -ForegroundColor Green
        $starttime = get-date
        if ($NameMatchingFile){
            Write-host "Importing contents of `$NameMatchingFile..." -NoNewline #I'm doing two Wheres instead of one, as I think this is faster
            $NameMatchingFile = import-csv $NameMatchingFile | ? {$_."msRTCSIP-PrimaryUserAddress"}| ? {$_.mail} |select @{Name=‘Source‘;Expression={$_.'msRTCSIP-PrimaryUserAddress'}},@{Name=‘Target‘;Expression={$_.mail}}
            Write-host "[OK]" -ForegroundColor Green
        }
    #EndOfBeginning
    }
  process{

        if ($NameMatchingFile){
            ForEach ($name in $NameMatchingFile){
                $i++
                $nowTime = get-date
                $projectedTime = ($nowTime - $startTime).Seconds / $i * ($NameMatchingFile.Count - $i)
                if ($projectedTime -gt [math]::Abs(60)){$projectedText = ([math]::Round(($projectedTime / 60),2), " minutes" -join " ")}
                    ELSE{$projectedText = (([math]::Round($projectedTime,2))," seconds" -join " ")}
                #"`$projectedTime $projectedTime"
                $percent = [math]::Round(($i/($NameMatchingFile.count)*100),2)
                Write-Progress -Activity ("Processing record $i of " + $NameMatchingFile.Count + "| Projected time remaining: $projectedText") -PercentComplete $percent -Status "$percent`% Completed" -CurrentOperation ("Replacing " + $name.Source + " with " +$name.Target +"...")

                #Add Replace $nameA with $nameB
                $FileInMemory.Replace($name.Source,$name.Target) | out-null
                #Write-host "[OK]" -ForegroundColor Green
                $lastTime = $nowTime
            }
        }
  #EndOfProcess
    }

     end{

     #Remove references to contosoAd
        Write-host ("Replacing contosoad.contoso.com with contoso.com..." ) -NoNewline
        $FileInMemory.Replace('contosoad.contoso.com','contoso.com')
        Write-host "[OK]" -ForegroundColor Green

    "Outputting file $Outfile"
    $FileInMemory | Out-File $OutFile
    }

#EndOfFunction
}


Update-OCSXMLv2