Get-InstalledNetVersion

There are number of resources online which show how to get the install .NET version from a server.

• MSDN: How to: Determine which .NET Framework versions are installed
• Stackoverflow: How to determine if .NET Core is installed

This is just a combination of couple of them into easy to use functions that can run on remote servers.

	<#
	.SYNOPSIS
	Checks the .NET versions installed on a computer/server.
	.PARAMETER ServerName
	The server to check.
	.EXAMPLE
	Get-InstalledNetVersion
	#>
	Function Get-InstalledNetVersion {
	Param (
	[Parameter(ValueFromPipelineByPropertyName = $true)]
	[string] $ServerName = $env:COMPUTERNAME
	)
	Process {
	$scriptBlock = {
	$ServerName = $args[0]
	# .net v1, v2, and v3
	$versions = New-Object System.Collections.Generic.List[PSObject]
	$35minus = dir "HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\"
	$root = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\"
	$rootLen = $root.Length
	$35minus = $35minus |? {
	$_.Name.Substring($rootLen).StartsWith("v2") `
	-or $_.Name.Substring($rootLen).StartsWith("v3")
	}
	foreach($net in $35minus) {
	$name = $net.Name.Substring($rootLen)
	$version = (Get-ItemProperty $net.PSPath Version).Version
	$release = $version.Split(".")[3]
	$props = @{
	Name = $name
	Version = $version
	Release = $release
	Description = $name
	}
	$obj = New-PsType -PsType "NetVersion" -Property $props
	$versions.Add($obj)
	}
	# .net v4
	$4 = dir "HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"
	$root = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full"
	$rootLen = $root.Length
	$description = ""
	# https://msdn.microsoft.com/en-us/library/hh925568(v=vs.110).aspx?f=255&MSPPError=-2147217396
	$release = (Get-ItemProperty $4.PSPath Release).Release
	switch($release) {
	"378389" { $description = "v4.5" }
	"378675" { $description = "v4.5.1 - Win8.1 or Win2012R2" }
	"378758" { $description = "v4.5.1 - Win7 SP1 to Win8" }
	"379893" { $description = "v4.5.2" }
	"393273" { $description = "v4.6 RC" }
	"393295" { $description = "v4.6 - Win10" }
	"393297" { $description = "v4.6" }
	"394254" { $description = "v4.6.1 - Win10" }
	"394271" { $description = "v4.6.1" }
	"394802" { $description = "v4.6.2 - Win10 An. Update" }
	"394806" { $description = "v4.6.2" }
	"460798" { $description = "v4.7 - Win10 Creators Update" }
	"460805" { $description = "v4.7" }
	"461308" { $description = "v4.7.1 - Win10 Fall Creators Update" }
	"461310" { $description = "v4.7.1" }
	"461808" { $description = "v4.7.2 - Win10 April 2018 Update" }
	"461814" { $description = "v4.7.2" }
	default { $description = "unknown ... check https://msdn.microsoft.com/en-us/library/hh925568(v=vs.110).aspx?f=255&MSPPError=-2147217396" }
	}
	$props = @{
	Name = "v4"
	Version = (Get-ItemProperty $4.PSPath Version).Version
	Release = $release
	Description = $description
	}
	$obj = New-PsType -PsType "NetVersion" -Property $props
	$versions.Add($obj)
	# .net core
	$cores = Get-InstalledNetCoreVersion -ServerName $ServerName
	foreach($c in $cores) {
	$versions.Add($c);
	}
	return $versions
	}
	$versions = Invoke-Command -ComputerName $ServerName -ScriptBlock $scriptBlock -ArgumentList $ServerName
	return $versions
	}
	}
	<#
	.SYNOPSIS
	Checks the .NET versions installed on a computer/server.
	.PARAMETER ServerName
	The server to check.
	.EXAMPLE
	Get-InstalledNetVersion
	#>
	function Get-InstalledNetCoreVersion {
	Param (
	[Parameter(ValueFromPipelineByPropertyName = $true)]
	[string] $ServerName = $env:COMPUTERNAME
	)
	Process {
	$scriptBlock = {
	$ServerName = $args[0]
	# https://stackoverflow.com/questions/38567353/how-to-determine-if-net-core-is-installed
	$search = (dir (Get-Command dotnet).Path.Replace('dotnet.exe', 'shared\Microsoft.NETCore.App')).Name
	$versions = @()
	foreach($version in $search) {
	$props = @{
	Name = "core-$version"
	Version = $version
	Release = ""
	Description = "core $version"
	}
	$obj = New-PsType -PsType "NetVersion" -Property $props
	$versions += @($obj)
	}
	return $versions
	}
	$versions = Invoke-Command -ComputerName $ServerName -ScriptBlock $scriptBlock -ArgumentList $ServerName
	return $versions
	}
	}
	Function New-PsType {
	[CmdletBinding()]
	Param (
	[Parameter(Mandatory = $true)]
	[string] $PsType,
	[System.Collections.IDictionary] $Property
	)
	# http://stackoverflow.com/questions/59819/how-do-i-create-a-custom-type-in-powershell-for-my-scripts-to-use
	if($Property) {
	$m = New-Object PSObject -Property $Property
	} else {
	$m = New-Object PSObject
	}
	$null = $m.PSObject.TypeNames.Insert(0,$PsType)
	return $m;
	}

view raw Get-InstalledNetVersion.ps1 hosted with ❤ by GitHub