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Converting arrays

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a friend asked me this: how do I convert one type of array to another when the cast between the items is valid? I did this before but still it took me 15 min. to find how to do it. so here is a reminder for me.

here is a sample where Son is derived from Father:

Father[] f =

new Father[] {new Son(2,1), new Son(3,2) };

System.Collections.ArrayList a =

new System.Collections.ArrayList(f);

Son[] s = (Son[])a.ToArray(

typeof(Son));