反序列化（SharePoint）XML到PSObject和性能

Question

Beloved SO'ers ,

I have a server running Powershell to access SharePoint 2010 data via Web Services. I have several PS Scripts doing business logic on SharePoint data. While this script works, my issue is performance .

• I'm omitting the annoying ows_ prefix
• I've considered using an XMLDocument and SelectNodes but remember, this is no telling what fields will be provided so this has to be dynamic.
• I've tried to access PSSerializer as this post recommends but I don't have it. Is it in PS 3.0?
• I'm searching for a multi-value field and turning that into an SPFieldLookupValueCollection
• The performance hit appears to be taking place during iteration of matches2.Matches

It took around 45 seconds to process 800 items and I believe this method could be improved.

SP2010XmlToPSObject.ps1

param ([string]$xml)

#Handle empty result set
if($xml.IndexOf("ItemCount='0'") -ge 0){return @()}

#Load SharePoint DLL
$a = [Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")

$rows = @()
$matches = $xml | Select-String "(<z:row(?:.|\n|\r)*?(?:/>))" -AllMatches

$matches.Matches | %{
      $obj = New-Object PSObject
      $matches2 = $_.Value | Select-String "(?:ows_)(\w*)(?:=)(?:`")((.*?)(?:`"))" -AllMatches
      $matches2.Matches | % {
            #handle multi-value fields
            if($_.Groups[3].Value.IndexOf(";#") -gt -1){
                  #$a = @()
                  $o = New-Object Microsoft.SharePoint.SPFieldLookupValueCollection $_.Groups[3].Value
                  $obj | Add-Member NoteProperty $_.Groups[1].Value $o
            }
            else{
                  $obj | Add-Member NoteProperty $_.Groups[1].Value $_.Groups[3].Value
            }
      }

      $rows += $obj
}

return $rows

ps Sorry, looks like SO syntax highlighter didn't like powershell's escape (`) char.

Answer 1

Looks like there an open bug report on this:

http://connect.microsoft.com/PowerShell/feedback/details/573286/xml-serialization-of-psobject-is-not-possible