try {Import-Module ServerManager -ErrorAction StopImport-Module BitsTransfer -ErrorAction Stop
}
catch {Write-Warning "$_"; exit
}$packages_path = "D:\software"  # Packages storage directoryfunction Download() {$isExists = Test-Path $packages_pathif(!$isExists) {New-Item -ItemType Directory $packages_path}# instantiate a socket object,# Try connect to download the source$testConn = New-Object Net.Sockets.TcpClient$testConn.Connect("$address", 80)  # $address need to customif($testConn) {Start-BitsTransfer $address/dotnet4.0.exe $packages_pathStart-BitsTransfer $address/dotnet4.5.exe $packages_pathreturn $true} else {return $false}
}function CheckVersion {# To detect the .NET Framework whether exists in the registry$isExists = Test-Path "HKLM:\SOFTWARE\Microsoft\NET Framework Setup\"if(!$isExists) {return $false} else {# Returns the current .NET Framework version$version = gci "HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP" | sort pschildname -desc | select -fi 1 -exp pschildnamereturn $version}
}function Update {Add-WindowsFeature As-Net-Framework  # Update .NET Framework 3.5# The first cycle:#   Perfrom CheckVersion function, returns the value assigned to $response#   If $response < 4.0, start install dotnet 4.0 and dotnet 4.5#   Enter the second loop# The second cycle:#   Again to perfrom CheckVersion function#   If the installation is successful,#   the value of variable $response at this time will be greater than 4.0,#   the output corrent .NET Framework version and returns $truefor($i=0;$i -lt 2;$i++) {$response = CheckVersionif($response -lt "v4.0") {Start-Process -Wait $packages_path\dotnet4.0.exe -ArgumentList "/quiet"Start-Process -Wait $packages_path\dotnet4.5.exe -ArgumentList "/quiet"} else {Write-Host "DotNET current version is: $response"return $true}}# Above cycle without entering the return statement,# then .NET Framework update failed, this function will return the $falsereturn $false
}function Install {$features = Get-WindowsFeature Web-Server,Web-Static-Content,Web-Default-Doc,Web-Http-Errors,Web-Http-Redirect,Web-Asp-Net,Web-Net-Ext,Web-ISAPI-Ext,Web-ISAPI-Filter,Web-Http-Logging,Web-Request-Monitor,Web-Filtering,Web-IP-Security,Web-Stat-Compression,Web-Mgmt-Console,Web-WHC# Install IIS featuresforeach($item in $features) {Add-WindowsFeature $item}Remove-WindowsFeature Web-Dir-Browsing  # Delete "Web-Dir-Browsing" function
}function Registry {$is64bit = [IntPtr]::Size -eq 8  # To determine whether a system is 64-bit$isapiPath_32 = "$env:windir\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll"Set-Location "$env:windir\Microsoft.NET\Framework\v4.0.30319\"; .\aspnet_regiis.exe -iif($is64bit) {$isapiPath_64 = "$env:windir\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll"Set-Location "$env:windir\Microsoft.NET\Framework64\v4.0.30319\"; .\aspnet_regiis.exe -i}
}try {$chkGet_result = Download$chkUp_result = Updateif($chkUp_result) {Install; Registry} else {Write-Warning "Update .NET Framework error."}
}
catch {Write-Warning "$_"; exit
}
finally {Remove-Item $packages_path -RecurseRemove-Item $MyInvocation.MyCommand.Path -Force
}