Script to be compiled into a Service that will automatically switch off Wi-Fi when an Ethernet connection is detected and switch it back on when no Ethernet connection is detected.

Service-WiFi-LAN-Autoswitch.ps1

#"Running" | Out-File "C:\Temp\Service.log" -append
Do {
	#"Start Of Loop" | Out-File "C:\Temp\Service.log" -append
	$Adaptors = Get-WmiObject -query "SELECT * FROM Win32_NetworkAdapter WHERE PhysicalAdapter = 1 AND NOT Description LIKE '%Virtual%' AND (NetConnectionID LIKE '%Wireless Network Connection%' OR NetConnectionID LIKE '%Local Area Connection%' OR NetConnectionID LIKE '%Wi-Fi%' OR NetConnectionID LIKE '%Ethernet%')"
	$NetEnabledAdaptors = @($Adaptors | Where {$_.NetEnabled -eq $true}).Count
	#"Adaptors Found: $($Adaptors.Count)" | Out-File "C:\Temp\Service.log" -append
	#"Net Enabled Adaptors:  $NetEnabledAdaptors"  | Out-File "C:\Temp\Service.log" -append
	if ($NetEnabledAdaptors -gt 1)
	{
		#"WiFi and LAN Connected. Disabling WiFi..." | Out-File "C:\Temp\Service.log" -append
		$WiFi = ($Adaptors | Where {($_.NetConnectionID -like "Wireless Network Connection*" -or $_.NetConnectionID -LIKE '*Wi-Fi*') -and $_.NetEnabled -eq $true})
		#"Disabling Adaptor... $($WiFi.Description)" | Out-File "C:\Temp\Service.log" -append
		
		$returnvalue = $WiFi.Disable().ReturnValue
		If ($returnvalue -eq 0)
		{
			#"WiFi Disabled Successfully" | Out-File "C:\Temp\Service.log" -append
		}
		else 
		{	
			#"Error Disabling WiFi: $returnvalue" | Out-File "C:\Temp\Service.log" -append
		}
	}
	elseif ($NetEnabledAdaptors -eq 0)
	{
		#"No connections detected. Enabling WiFi..." | Out-File "C:\Temp\Service.log" -append
		$WiFi = ($Adaptors | Where {($_.NetConnectionID -like "Wireless Network Connection*" -or $_.NetConnectionID -LIKE '*Wi-Fi*') -and $_.NetEnabled -eq $false})
		
		#"Enabling Adaptor... $($WiFi.Description)" | Out-File "C:\Temp\Service.log" -append
		$returnvalue = $WiFi.Enable().ReturnValue
		If ($returnvalue -eq 0)
		{
			#"WiFi Enabled Successfully" | Out-File "C:\Temp\Service.log" -append
		}
		else 
		{	
			#"Error Enabling WiFi: $returnvalue" | Out-File "C:\Temp\Service.log" -append
		}
	}
	else {
		#"Only One Connection... No Action required." | Out-File "C:\Temp\Service.log" -append
	}
	#"Sleeping" | Out-File "C:\Temp\Service.log" -append
	Start-Sleep -Seconds 5
} while ($true)