Dictionary with multiple values per key

Question

I need a datatype for the PowerShell to add different values to a key. which type should I choose?

The data are like:

+--------+--------+--------+--------+   
| Serv1  | Serv2  | Serv3  | Serv4  |   
| -------+--------+--------+------- |    
| User1  | User2  | User3  | User4  |   
| User3  | User1  | User2  | User4  |   
| User7  | User8  | User9  | ------ |   
+--------+--------+--------+--------+

briantist · Accepted Answer · 2016-04-06 17:01:48Z

5

This would be easier to answer with more information. But based on that, it looks like a [hashtable] where the values are arrays is what you want.

Example:

$hash = @{
    Serv1 = @(
        'User1',
        'User3',
        'User7'
    )

    Serv2 = @(
        'User2',
        'User1'
    )
}

# add a new user to an existing key

$hash.Serv2 += 'User8'

# add a new key

$hash.Serv3 = @(
    'User3',
    'User2'
)

edited Apr 6, 2016 at 17:01

answered Apr 6, 2016 at 16:40

briantist

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6 Comments

Anthony Stringer Over a year ago

might need to replace the , with ; between Serv1 and Serv2 when creating $hash

briantist Over a year ago

Good call @AnthonyStringer, better yet, no separator needed with newline.

Chris Kuperstein Over a year ago

I've been on the fence about using the += operator in powershell since I'm mindful about resource usage when upscaling scripts. From what I (currently) understand, you're reallocating memory and recreating the hashtable every time you do a += ; Is this how powershell handles this?

Anthony Stringer Over a year ago

@ChrisKuperstein i believe this is only noticeable in larger arrays, but if you wanted to, you could replace all three of the @( with [System.Collections.ArrayList]( and replace $hash.Serv2 += 'User8' with [void]$hash.Serv2.Add('User8')

Chris Kuperstein Over a year ago

For any other readers, I found an incredibly insightful discussion and answer chain here: stackoverflow.com/questions/226596/…

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