how to upcast object array to another type of object array in C#?

Question

1

I want to upcast object array to different array of different object type like below

object[] objects; // assuming that it is non-empty

CLassA[] newObjects = objects as ClassA[]; // assuming that object to ClassA is valid upcasting

is there any way other than upcasting each element individually?

sgm
2,3481611

asked Jul 15 '09 at 14:18

75% accept rate

zvolkov · Answer 1 · 2009-07-15 14:25:30Z

1

using System.Linq;

newObjects = objects.Select(eachObject => (ClassA)eachObject).ToArray();

answered Jul 15 '09 at 14:25

zvolkov
3,9741519

Thanks. This is what i was looking for. – malay Jul 15 '09 at 14:31

zvolkov · Answer 2 · 2009-07-15 16:06:19Z

2

Or I guess you could try something like this for even shorter syntax:

newObjects = objects.Cast<ClassA>().ToArray();

answered Jul 15 '09 at 16:06

zvolkov
3,9741519

This is even better. Thanks – malay Jul 16 '09 at 5:57

zvolkov · Answer 3 · 2009-07-16 11:27:25Z

As this post suggests, you may be able to do the following trick (untested):

newObjects = (ClassA[])(object)objects;

Note that in C# 4.0 you won't need to cast, you will be able to directly assign newObjects = objects.

3 Answers