Get-ProjectItems.ps1

<#
    .SYNOPSIS
    Gets VS project <Item> elements from a project
#>
function Get-ProjectItems {
    [CmdletBinding()]
    Param(
        [string] $ProjFilePath,
        [Parameter(Mandatory = $true)]
        [ValidateSet('Compile', 'Content', 'None', 'Analyzer', 'Reference', 'EmbeddedResource')]
        [string] $ItemType
    )

    if (-Not (Test-Path $ProjFilePath)) { throw "Project file does not exist at '$ProjFilePath'" }

    Write-Verbose "Checking project file '$ProjFilePath' for '$ItemType'"
    $projFileContent = [xml](Get-Content $ProjFilePath)
    $projFolder = Split-Path -Path $ProjFilePath -Parent

    $projItems = @()
    foreach ($projItemGroup in $projFileContent.Project.ItemGroup) {
        if ($projItemGroup.GetType() -eq [System.String]) {
            Write-Verbose "Empty project item group"
            continue
        }

        $items = $projItemGroup.GetElementsByTagName($ItemType)

        foreach ($item in $items) {
            if ($item | Get-Member -Name "Include") {
                $absPath = Join-Path -Path $projFolder -ChildPath $item.Include 

                if (-not (Test-Path -Path $absPath)) {
                    Write-Warning "ProjectFile '$ProjFilePath' reports that file '$absPath' is part of the project but it cannot be found on disk "
                    continue
                }
                $isLinked = (-Not ([string]::IsNullOrWhiteSpace($item.Link)))
                $subtype = if ($null -ne $item.SubType) { $item.SubType } else { "None" }
                $copyToOutputDirectory = if ($null -ne $item.CopyToOutputDirectory) { $item.CopyToOutputDirectory } else { "Do not copy" }
                $itemProps = @{'FullName' = $absPath; 'Path' = $item.Include; 'IsLinked' = $isLinked; 'Subtype' = $subtype; 'CopyToOutputDirectory' = $copyToOutputDirectory }
                $projItems += (New-Object -TypeName PSObject -Property $itemProps)
            }
        }
    }
    
    Write-Verbose "Project has $($projItems.Count) items"

    return $projItems
}