Powershell: Install-dotNET4 function

This function will download and install ,NET 4.0. It uses the Get-Framework-Versions function to determine if the installation is necessary or not. Internet Connectivity will be required as the script auto downloads the setup file (and sleeps for 360 seconds... I had a function in there to monitor for install completion at first, turns out the setup file spawns so many childprocesses the function just got confused and locked up -_-)

Alternatively you could drop the installation file in the folder specified on the $folderPath variable too. That will skip the download and use the file. This function easily adapts in to other versions f.e. I use it for Powershell 3 installs as well!

_Function install-dotNet4 () {
   if(($InstalledDotNET -eq "4.0") -or ($InstalledDotNET -eq "4.0c")){
       write-host ".NET 4.0 Framework is already installed" -foregroundcolor Green
   } else{

       #set a var for the folder you are looking for
       $folderPath = 'C:\Temp'

       #Check if folder exists, if not, create it
       if (Test-Path $folderpath){
           Write-Host "The folder $folderPath exists." -ForeGroundColor Green
       } else{
           Write-Host "The folder $folderPath does not exist, creating..." -NoNewline -ForegroundColor Red
           New-Item $folderpath -type directory | Out-Null
           Write-Host " - done!" -ForegroundColor Green
       }

       # Check if file exists, if not, download it
       $file = $folderPath+"\dotNetFx40_Full_x86_x64.exe"
       if (Test-Path $file){
           write-host "The file $file exists." -ForeGroundColor Green
       } else {
           #Download Microsoft .Net 4.0 Framework
           Write-Host "Downloading Microsoft .Net 4.0 Framework..." -nonewline -ForeGroundColor DarkYellow
           $clnt = New-Object System.Net.WebClient
           $url = "http://download.microsoft.com/download/9/5/A/95A9616B-7A37-4AF6-BC36-D6EA96C8DAAE/dotNetFx40\_Full\_x86\_x64.exe"
           $clnt.DownloadFile($url,$file)
           Write-Host " - done!" -ForegroundColor Green
       }
       #Install Microsoft .Net Framework
       Write-Host "Installing Microsoft .Net Framework..." -nonewline -ForegroundColor DarkYellow
       $dotNET4 = $folderPath+"\dotNetFx40_Full_x86_x64.exe /quiet /norestart"
       Invoke-Expression $dotNET4
       write-host " - done!" -ForegroundColor Green
       start-sleep -seconds 360
   }
}_

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