Script for detecting orphaned files in C# projects

ProjectOrphanScouter.ps1

function Search-ItemsRecursive{
  [CmdletBinding()]
  param($ProjectItems, $Filter, [switch]$Recurse=$false)
  foreach ($item in $ProjectItems) {
    if($(. $Filter $item))
    {
        $item        
    }
    if(($item.ProjectItems -ne $null) -and $Recurse){
        Search-ItemsRecursive -ProjectItems $item.ProjectItems -Filter $Filter -Recurse:$Recurse
    }
  }
}

function Find-OrphanFilesInSolution([switch]$IgnoreObj=$true){
    Get-Project -All | Find-OrphanFilesInProject -IgnoreObj:$IgnoreObj
}    

function Find-OrphanFilesInProject{    
    [CmdletBinding()]
    param([Parameter(ValueFromPipeline=$true)]$Projects, [switch]$IgnoreObj=$true)
    process{
        $toProcess = if($Projects){$Projects}else{Get-Project}    
        foreach($p in $toProcess){
            $projectPath = Split-Path $p.FullName -Parent            
            $csFilesInProject = Search-ItemsRecursive -ProjectItems $p.ProjectItems -Filter {param($item)$item.Name -like "*.cs"} -Recurse |% {$_.Properties.Item("FullPath").Value}
            Get-ChildItem $projectPath -Filter "*.cs" -Recurse |? { $csFilesInProject -notcontains $_.FullName } |? {(-not $IgnoreObj) -or ($_.Directory -notlike "*\obj*")} |select FullName 
        }
    }    
}