PowerShell Multi-Threading - multithreading

Question

I'm going to develop an asset discovery using ping. I need to ping multiple networks simultaneously, so the discovery speed would grow. In order to do that, I define a hash table as the following, containing destination networks. So, how can I ping multiple network simultaneously?
Please take a look at a snippet of my code:
$Hosts = #{}
$Time = Get-Date
$Networks = #{
Network_X = 1..254 | ForEach-Object{ "192.168.50.$_"}
Network_Y = 1..254 | ForEach-Object{ "192.168.63.$_"}
Network_Z = 1..254 | ForEach-Object{ "192.168.65.$_"}
}
I've failed using "ForEach-Object" or "Foreach".

Answer 1

You can use Ping.SendPingAsync() to initiate a ping asynchronously:
$PingTasks = foreach($network in $Networks.GetEnumerator()) {
foreach($ip in $network.Value){
# for each IP in each network, create a new object with both details + an async ping task
[pscustomobject]#{
Network = $network.Name
IP = $ip
Request = [System.Net.NetworkInformation.Ping]::new().SendPingAsync($IP)
}
}
}
# Wait for all tasks to finish
[System.Threading.Tasks.Task]::WaitAll($PingTasks.Request)
# Gather results
foreach($task in $PingTasks){
if($task.Request.Result.Status -eq 'Success'){
# Extract Network + IP from the hosts that responded to our ping
$Hosts[$task.IP] = $task |Select-Object Network,IP
}
}
$Hosts will now contain an entry for each successfully ping'ed IP, with the network name attached.