Avoid using '+=' for anything. Every time you add something using that method,
it destroys and recreates the entire array. For small lists that not a big
deal, but for large lists it is a performance nightmare. I personally prefer
array lists for ease of manipulation, and the fact that I can create arrays of
arrays or arrays of any object, really.
[System.Collections.ArrayList]$Array = @()
$array.add('Something')
$array.add('SomethingElse')
$array.add('SomethingElse2')
To remove:
$array.remove('SomethingElse')
For your second part - does this work?
$array|foreach{test-connection -ComputerName $_ -count 1}|select-object
-Property PSComputerName,Address,IPV4Address
--Donnie Taylor
Microsoft MVP - Cloud and Datacenter
Management<https://mvp.microsoft.com/en-us/PublicProfile/5002833>
From: [email protected] [mailto:[email protected]] On
Behalf Of Raymond Peng
Sent: Thursday, October 19, 2017 12:34 PM
To: [email protected]; [email protected]
Subject: [EXTERNAL] [powershell] Powershell array question and formatting
question
Hi All,
Still picking up powershell so please let me know if you see any obvious
blunders: I see it say the collection is of a fixed size but how do I remove?
I have declared an array with $array="name1","name2", etc...
I can access each element with $array[0]...
I can use $array += "name5,"name6" but I can not figure out how to remove an
element
I have tried the Remove method without any luck as well as -=
PS C:\WINDOWS\system32> $array.Remove("cxsupportsystems")
Exception calling "Remove" with "1" argument(s): "Collection was of a fixed
size."
At line:1 char:1
+ $array.Remove("cxsupportsystems")
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : NotSupportedException
PS C:\WINDOWS\system32> $array
kcfileserver
wnweb01
pvfile01
corpcxtsgp01
cxsupportsystems
Lastly - formatting question:
Is there any way to just crop out the rest and keep the destination /
IPv4Address info? I tried format-table / select-object but it does not do what
I want. I've tried piping after the test-connection in the scriptblock but
output is not what I want
PS C:\WINDOWS\system32> foreach ($comp in $array){Test-Connection $comp -Count
1}
Source Destination IPV4Address IPV6Address
Bytes Time(ms)
------ ----------- ----------- -----------
----- --------
L-SM-RPENG1 kcfileserver 172.29.133.130
32 62
L-SM-RPENG1 wnweb01 172.29.118.101
32 66
L-SM-RPENG1 pvfile01 172.29.171.28
32 72
L-SM-RPENG1 corpcxtsgp01 172.29.118.164
32 70
L-SM-RPENG1 cxsupportsys... 10.2.1.238
32 55
Thank you,
Ray
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