Convert jagged int[][] array to object[][] array

Question

There is any way to convert/cast an int[][] array into an object[][] array?

int[][] = FillArray(); object[][] = iArray;

Why would you want to do that? Performance will be affected considerably. — Matt Johnson-Pint
– Matt Johnson-Pint, Commented Sep 26, 2014 at 19:00
You might want to change over to using List<> instead. Easier to work with and convert. — gunr2171
– gunr2171, Commented Sep 26, 2014 at 19:03
@Shaharyar your title edit is invalid. Jagged arrays != multidimensional arrays. — Lucas Trzesniewski
– Lucas Trzesniewski, Commented Sep 26, 2014 at 19:08

Matt Johnson-Pint · Accepted Answer · 2014-09-26 19:19:49Z

5

If you don't want to use LINQ, you can use Array.ConvertAll.

int[][] iArray = FillArray(); object[][] oArray = Array.ConvertAll(iArray, x => Array.ConvertAll(x, y => (object) y));

The other answers with LINQ's Cast method are okay also.

But as I pointed out in comments, make sure you realize that you are boxing each value of the array. That can lead to performance problems if the array is of any considerable size.

edited Sep 26, 2014 at 19:19

answered Sep 26, 2014 at 19:05

Matt Johnson-Pint

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5 Comments

Doro Over a year ago

Thank you for the code but the int[][] array is populate with random values.

gunr2171 Over a year ago

@doro, those values are an example

Matt Johnson-Pint Over a year ago

That's was just an example. Call your FillArray method if you like. Edited.

aquinas Over a year ago

-1 for not using the same random values he is using!

Doro Over a year ago

Well, the code compiled and seems to work. I am not sure for the result but this is smt else. Thank you! :-)

Habib · Accepted Answer · 2014-09-26 19:04:56Z

4

You can do:

object[][] objArray = iArray.Select(r => r.Cast<object>().ToArray()) .ToArray();

answered Sep 26, 2014 at 19:04

Habib

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Comments

gunr2171 · Accepted Answer · 2014-09-26 19:09:44Z

3

Some LINQ:

int[][] iArray = FillArray(); object[][] oArray = iArray.Select(i => i != null ? i.Cast<object>().ToArray() : null) .ToArray();

edited Sep 26, 2014 at 19:09

gunr2171

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answered Sep 26, 2014 at 19:04

Lucas Trzesniewski

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2 Comments

gunr2171 Over a year ago

Why have a ternary operator? int can't be null, nor can a row.

Lucas Trzesniewski Over a year ago

@gunr2171 int can't be null, but int[] can.

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