C# convert ArrayList to 2D int array

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Is it possible to convert a ArrayList to a 2D int[1,13] array ?

The ArrayList is all numbers like "1111100000000", "0111110000000".
And I want them to look like this:

int[,] a = { { 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 }, { 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }, { 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0 }, { 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 } };

The reason I want to convert them is that I don't know how to create multi-array if conditions with an ArrayList like:

if(a[i,j] >= b[i,j])
{
do something...
}

Posted 17-Dec-15 10:10am

Member 11380736

Updated 17-Dec-15 12:13pm

Patrice T

v2

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Sergey Alexandrovich Kryukov 17-Dec-15 16:16pm

Yes, of course, but it depends on the content of the ArrayList and the interpretation of its data you want to use. It should be extremely simple. What's the problem?
By the way, you should not have used ArrayList in first place, as it is obsolete, System.Collections.Generic.List should be used instead. If ArrayList is legacy which you cannot change, you can use it.
—SA

Member 11380736 17-Dec-15 16:23pm

The ArrayList is all numbers like "1111100000000", "0111110000000".
And I want them to look like this:

int[,] a = { { 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 }, { 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }, { 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0 }, { 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 } };

The reason I want to convert them is that I don't know how to create multi-array if conditions with an ArrayList like:

if(a[i,j] >= b[i,j])
{
do something...
}

Sergey Alexandrovich Kryukov 17-Dec-15 17:38pm

You had to reply to my comment. I did not get any notification.
Are you saying that ArrayList elements are strings? Are they of the same length? Why so bad? Anyway, even if so, what's the problem? Why "if" conditions? (What is a an b, and so on?)
Are they numbers only 1 and 0s? If so, you would better need a BitArray on output, or array of BitArray instances, or just array[ushort]...
—SA

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BillWoodruff · Answer 1 · 2015-12-17T17:34:00

You could use Linq to create an int[],[] Array:

C#

// required
using System.Linq;

int[],[] jaggedArray = aList.ToArray().Select(elem => elem.ToString().Select(ch => (int)Char.GetNumericValue(ch)).ToArray()).ToArray()

// or

int[],[] jaggedArray = aList.ToArray().Select(elem => elem.ToString().Select(ch => ch - '0').ToArray()).ToArray()

// test
int val12 = jaggedArray[1][2];;

Note: CharGetNumericValue(Char) returns a Type 'Double which means if you use it with a Unicode Char, you might get a fraction back !

I agree with Sergey that 'ArrayList is no longer a wise choice ... if it's possible ... you should use a List<List<int>>