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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Andy Sather on at

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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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Johny Be Good 61 on at

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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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Inge M. Bruvik 1,105 Moderator on at

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Have you looked at this ?

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

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YUN ZHU 95,311 Super User 2025 Season 2 on at

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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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Johny Be Good 61 on at

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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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Johny Be Good 61 on at

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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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YUN ZHU 95,311 Super User 2025 Season 2 on at

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Hi, try the following.

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Johny Be Good 61 on at

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

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