check_net_framework_installed.ps1

<#
    Script Name : Get-NetFrameworkVersion.ps1
    Description : This script reports the various .NET Framework versions installed on the local or a remote computer.
    Author      : Martin Schvartzman
    Last Update : July-2018
    Keywords    : NETFX, Registry
    Reference   : https://msdn.microsoft.com/en-us/library/hh925568

    O/P         : http://pix.toile-libre.org/upload/original/1537652518.png
#>

param(
    [string]$ComputerName = $env:COMPUTERNAME
)

$dotNetRegistry = 'SOFTWARE\Microsoft\NET Framework Setup\NDP'
$dotNet4Registry = 'SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full'
$dotNet4Builds = @{
    '30319'  = @{ Version = [System.Version]'4.0'                                                     }
    '378389' = @{ Version = [System.Version]'4.5'                                                     }
    '378675' = @{ Version = [System.Version]'4.5.1'   ; Comment = '(8.1/2012R2)'                      }
    '378758' = @{ Version = [System.Version]'4.5.1'   ; Comment = '(8/7 SP1/Vista SP2)'               }
    '379893' = @{ Version = [System.Version]'4.5.2'                                                   }
    '380042' = @{ Version = [System.Version]'4.5'     ; Comment = 'and later with KB3168275 rollup'   }
    '393295' = @{ Version = [System.Version]'4.6'     ; Comment = '(Windows 10)'                      }
    '393297' = @{ Version = [System.Version]'4.6'     ; Comment = '(NON Windows 10)'                  }
    '394254' = @{ Version = [System.Version]'4.6.1'   ; Comment = '(Windows 10)'                      }
    '394271' = @{ Version = [System.Version]'4.6.1'   ; Comment = '(NON Windows 10)'                  }
    '394802' = @{ Version = [System.Version]'4.6.2'   ; Comment = '(Windows 10 1607)'                 }
    '394806' = @{ Version = [System.Version]'4.6.2'   ; Comment = '(NON Windows 10)'                  }
    '460798' = @{ Version = [System.Version]'4.7'     ; Comment = '(Windows 10 1703)'                 }
    '460805' = @{ Version = [System.Version]'4.7'     ; Comment = '(NON Windows 10)'                  }
    '461308' = @{ Version = [System.Version]'4.7.1'   ; Comment = '(Windows 10 1709)'                 }
    '461310' = @{ Version = [System.Version]'4.7.1'   ; Comment = '(NON Windows 10)'                  }
    '461808' = @{ Version = [System.Version]'4.7.2'   ; Comment = '(Windows 10 1803)'                 }
    '461814' = @{ Version = [System.Version]'4.7.2'   ; Comment = '(NON Windows 10)'                  }
}

foreach($computer in $ComputerName) {
    if($regKey = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $computer)) {
        if ($netRegKey = $regKey.OpenSubKey("$dotNetRegistry")) {
            foreach ($versionKeyName in $netRegKey.GetSubKeyNames()) {
                if ($versionKeyName -match '^v[123]') {
                    $versionKey = $netRegKey.OpenSubKey($versionKeyName)
                    $version = [System.Version]($versionKey.GetValue('Version', ''))
                    New-Object -TypeName PSObject -Property ([ordered]@{
                            ComputerName = $computer
                            Build        = $version.Build
                            Version      = $version
                            Comment      = ''
                        })
                }
            }
        }

        if ($net4RegKey = $regKey.OpenSubKey("$dotNet4Registry")) {
            if(-not ($net4Release = $net4RegKey.GetValue('Release'))) {
                $net4Release = 30319
            }
            New-Object -TypeName PSObject -Property ([ordered]@{
                    ComputerName = $Computer
                    Build        = $net4Release
                    Version      = $dotNet4Builds["$net4Release"].Version
                    Comment      = $dotNet4Builds["$net4Release"].Comment
                })
        }
    }
}