Foreach loop in powershell with hasharray - powershell

Question

I'm writing a powershell script to ping all the servers and check which are offline. but i have a bug. By name it works perfectly. But when i do test-connection with an IP it seems to work BUT i cant output the name of the IP in the hashlist. Could someone help me figure this out? Thanks!!
System.Collections.Hashtable.keys Is online/available, This is what it outputs. But i want it to say "Servername is online/available"
#Creating IP Array list
$ip_array = #{
Server = [ipaddress] "192.168.1.1"
sws = [ipaddress] "192.168.1.1"
}
Foreach ($ip in $ip_array)
{
if((Test-Connection -IPAddress $ip.values.ipaddresstostring -quiet -count 1 ) -eq $false)
{
write-output("$ip.keys Is offline/unavailable, please troubleshoot connection, script is terminating") | Red
}
else
{
$ping = $true
write-output("$ip.keys Is online/available") | Green
}
}

Answer 1

PowerShell's default pipeline semantics (any collection that can be enumerated and unraveled will be) makes dictionaries a pain to work with - piping them anywhere would result in a list of disjoint key-value-pairs, dictionary itself lost.
For this reason, PowerShell refuses to automatically enumerate dictionaries, and you must manually obtain an enumerator in order to loop over the entries in it:
foreach($entry in $ip_hash.GetEnumerator()){
# reference `$entry.Key` or `$entry.Name` for the key (eg. Server)
# reference `$entry.Value` for the value (eg. 192.168.1.1)
}

Answer 2

If you really intend to use a Hashtable for this, combining IP addresses with computernames, change to something like this:
# creating IP Hashtable
$ip_hash = #{
'192.168.1.1' = 'Server1'
'192.168.1.2' = 'Server2'
# etcetera
}
# loop through the hash, key-by-key
foreach ($ip in $ip_hash.Keys) {
$ping = Test-Connection -ComputerName $ip -Quiet -Count 1 -ErrorAction SilentlyContinue
if(!$ping) {
Write-Host "Server $($ip_hash[$ip]) is offline/unavailable, please troubleshoot connection, script is terminating" -ForegroundColor Red
}
else {
Write-Host "Server $($ip_hash[$ip]) is online/available" -ForegroundColor Green
}
}
Output would look like:
The Keys in the hash must all have unique values