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Editorial Team
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Asked: 2026-05-15T05:49:03+00:00

The code I’m writing receives an ArrayList from unmanaged code, and this ArrayList will

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The code I’m writing receives an ArrayList from unmanaged code, and this ArrayList will always contain one or more objects of type Grid_Heading_Blk. I’ve considered changing this ArrayList to a generic List, but I’m unsure if the conversion operation will be so expensive as to nullify the benefits of working with the generic list. Currently, I’m just running a foreach (Grid_Heading_Blk in myArrayList) operation to work with the ArrayList contents after passing the ArrayList to the class that will use it.

Should I convert the ArrayList to a generic typed list? And if so, what is the most efficient way of doing so?

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1 Answer

  1. Editorial Team

    Here’s a stab at a performant way to create a generic list from an ArrayList.

    List<Grid_Heading_Blk> myList = new List<Grid_Heading_Blk>(source.Count);
myList.AddRange(source.OfType<Grid_Heading_Blk>());

    By calling the constructor that accepts an int, the backing storage is allocated only once.

    As always, you should measure the performance using whatever tools you normally use.

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