Array.CreateInstance and Array.CreateInstanceFromArrayType have different behavior

[msedi]

As far as I have understood Array.CreateInstanceFromArrayType (see: #76478) should be used since it has better performance and matches AOT conditions.

Originally I was using Array.CreateInstance and wanted to switch Array.CreateInstanceFromArrayType but failed since now I need the array type, other than the element type.

Since I only have the element type, I assume I have to call <element type>.MakeArrayType() which is a substantial drawback in my situation.

Are there any suggestion to get around this problem?

[huoyaoyuan]

It only improves when you already have the array type. If you only have element type, then the API can't help you.

[msedi]

Thanks. From what I understand is that CreateInstance is not AOT-able, since it is marked with [RequiresDynamicCode] which is something I really need to think about. Fortunately, a quick search showed that I don't use it ;-)

[huoyaoyuan]

T and T[] are tracked separately in AOT. typeof(T) doesn't always preserve the metadata, layout and method body etc for T[].