Multidimensional arrays in ArrayList?

[MikeRosoft]

The documentation says: "Using multidimensional arrays as elements in an ArrayList collection is not supported." What exactly does this mean? The following code:

var arrayList = new System.Collections.ArrayList(); var item = new int[2, 2] { { 1, 2 }, { 3, 4 } }; arrayList.Add(item);

... normally adds the array to the list. The parameter of ArrayList.Add(value) is object, so it supports adding any object to the list; specifically disallowing multidimensional arrays would seem like an arbitrary limitation. (The elements of the inner array can be retrieved by casting the element, like this: ((int[,])arrayList[0])[1,0] .)

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Document Details

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• ID: 9fa6e8e6-c711-8423-a1b9-3ad1e51484ad
• Version Independent ID: 7400ed93-312d-9193-5eb4-512551cb66d9
• Content: ArrayList Class (System.Collections)
• Content Source: xml/System.Collections/ArrayList.xml
• Product: dotnet-api
• GitHub Login: @mairaw
• Microsoft Alias: mairaw

[mairaw]

@safern, @ianhays can you comment on this? Are multidimensional arrays supported but not recommended?