`ArrayList` incorrect remarks

[GeeLaw]

Type of issue

Other (describe below)

Description

It says:

Using multidimensional arrays as elements in an ArrayList collection is not supported.

This is factually false. Consider

$al = [System.Collections.ArrayList]::new();
$al.Add([int[,]]::new(2, 2)) | Out-Null;
$al.GetType();    # ArrayList
$al[0].GetType(); # int[,]
$al;              # four 0's

Did the author intend to mean

If you add an array as an element to an ArrayList al, you cannot access the indexer of that array without casting, so al[0][0] doesn't work. You need to write ((int[,])al[0])[0, 0] if al[0] is int[,].

Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.collections.arraylist?view=net-10.0#remarks

Content source URL

https://github.com/dotnet/dotnet-api-docs-temp/blob/live/xml/System.Collections/ArrayList.xml

Document Version Independent Id

6a622c60-e7f9-3105-0b79-96b74ed08569

Platform Id

8cf9e552-6fbf-c688-1a3c-ecf392888b8a

Article author

@dotnet-bot

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-collections