Multidimensional arrays in AL

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Posted on by Johny Be Good

I was looking at the Arrays and List documentation, wandering whether it is possible to create multidimensional arrays with AL language - https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/methods-auto/list/list-data-type

It seems that this option is not available, and it is impossible to create neither List of Lists, not Array of Arrays, because only primitives are accepted.

My questions are:

1) what do I need to do in order to return n-dimensional array from procedure

2) why such a common feature is not supported in the AL-language?

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Johny Be Good 61 on at

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RE: Multidimensional arrays in AL

That's what I needed! Thanks a lot Yun Zhu for your help!

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YUN ZHU 92,443 Super User 2025 Season 2 on at

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RE: Multidimensional arrays in AL

Hi, try the following.

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Johny Be Good 61 on at

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RE: Multidimensional arrays in AL

Yun Zhu, thanks for your reply! I saw the documentation, I think the problem is the lack of examples how to work with those collections. I haven't found examples how to work with multi-dimensional arrays, and I have an error trying to add new value

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Johny Be Good 61 on at

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RE: Multidimensional arrays in AL

Inge, thank you for response! Yes, I saw this article, and tried to create an array according to it:

trigger OnRun();

var

arr: Array [2] of Integer;

begin

arr[1][1] := 10;

end;

But editor failed, when set the value with the following error:

Cannot apply indexing with [] to an expression of type 'Integer'

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YUN ZHU 92,443 Super User 2025 Season 2 on at

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RE: Multidimensional arrays in AL

Hi, just adding Inge's reply, there are three types of Collection in Business Central: Array, Dictionary, List.

https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/methods-auto/dictionary/dictionary-data-type

Hope this helps.

Thanks.

ZHU

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Inge M. Bruvik 1,041 Moderator on at

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RE: Multidimensional arrays in AL

Have you looked at this ?

docs.microsoft.com/.../devenv-array-methods

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Johny Be Good 61 on at

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RE: Multidimensional arrays in AL

Hello, Andy! Thank you for the response. I wouldn't say that I need a support, I just curious why such a functionality wasn't implemented.

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Andy Sather on at

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RE: Multidimensional arrays in AL

Hello - We currently do not have dedicated Dev support via the Dynamics 365 Business Central forums, but I wanted to provide you some additional resources to assist. If you need assistance with debugging or coding I would recommend discussing this on one of our communities.

www.yammer.com/dynamicsnavdev

I will open this up to the community in case they have something to add.

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