NetFrameworkVersion.psm1

function Get-KeyPropertyValue($key, $property)
{
    if($key.Property -contains $property)
    {
        Get-ItemProperty $key.PSPath -name $property | select -expand $property
    }
}

function Get-VersionName($key)
{
   $name = Get-KeyPropertyValue $key Version
   $sp = Get-KeyPropertyValue $key SP
   $install = Get-KeyPropertyValue $key Install   
   $languages = (Get-Languages $key.PSPath) -join ", "
   $languagePackInfo = if($languages){"Language packs: $languages"}else{""}
   if($sp)
   {
        "$($_.PSChildName) $name SP $sp $languagePackInfo"
    }else{
    "$($_.PSChildName) $name $languagePackInfo"
    }
}

function Get-Languages($versionDir){    
    Get-ChildItem $versionDir |? {$_.PSChildName -match "\d{4}"} |% {[System.Globalization.CultureInfo]::GetCultureInfo([int]$_.PSChildName).Name}
}

function Get-FrameworkVersion{
   dir "hklm:\SOFTWARE\Microsoft\NET Framework Setup\NDP\" |? {$_.PSChildName -like "v*"} |%{
    if( $_.Property -contains "Version")
    {
        Get-VersionName $_
    }else{
        $parent = $_
        Get-ChildItem $_.PSPath |%{
            $versionName = Get-VersionName $_
            "$($parent.PSChildName) $versionName"

         }
        }    
    }
    $v4Directory = "hklm:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"
    if(Test-Path $v4Directory)
    {
        $v4 = Get-Item $v4Directory
        $version = Get-KeyPropertyValue $v4 Release        
        $languages = (Get-Languages $v4Directory) -join ", "
        $languagePackInfo = "Language packs: $languages"
        switch($version){
            378389 {".NET Framework 4.5 $languagePackInfo"; break;}
            378675 {".NET Framework 4.5.1 installed with Windows 8.1 or Windows Server 2012 R2 $languagePackInfo"; break;}
            378758 {".NET Framework 4.5.1 installed on Windows 8, Windows 7 SP1, or Windows Vista SP2 $languagePackInfo"; break;}
            379893 {".NET Framework 4.5.2 $languagePackInfo"; break;}
            { 393295, 393297 -contains $_} {".NET Framework 4.6 $languagePackInfo"; break;}
            { 394254, 394271 -contains $_} {".NET Framework 4.6.1 $languagePackInfo"; break;}
            { 394802, 394806 -contains $_} {".NET Framework 4.6.2 $languagePackInfo"; break;} 
        }
    }
}
Export-ModuleMember -Function Get-FrameworkVersion