Convert an array of chars to an array of integers

using System.Linq;

char[] array = { '1', '2', '3', '4' };
var ints = array.Select(x => int.Parse(x.ToString()));

If you convert each character to a string first, then use int.Parse (or still Convert.ToInt32) that will work.

Personally I'd use LINQ for this, e.g.

int[] sequence = array.Select(x => int.Parse(x.ToString())).ToArray();

... or use ToList if you're just as happy with List<int>.

If you want to use Char.GetNumericValue as suggested in another answer, you can use that with LINQ too:

int[] sequence = array.Select(x => (int) char.GetNumericValue(x)).ToArray();

Note that the cast to int is required because char.GetNumericValue returns a double. (There are Unicode characters for values such as "a half" for example.)

Or if you're absolutely sure you're just going to have ASCII digits, you could use the quick and dirty:

int[] sequence = array.Select(x => x - '0').ToArray();

try

for (int i = 0; i < arr.Length; i++)
 {
     seqence[i] = (int)Char.GetNumericValue(array[i]);
 }

You can may be use Enumerable.Range to achieve that. It generates a sequence of consecutive numbers from - to.

Just an example:

 IEnumerable<int> squares = Enumerable.Range(1, 10)

This is in the case if original char array is just a consecutive sequence of numbers in char.

If array is subject of arbitrary order and sequence, just use correct convertion:

array.Select(x => int.Parse(x.ToString()))

Use this:

for (int i = 0; i < array.Length; i++)
{
    sequence[i] = array[i] - '0';
}

There are many correct answers here, but (unless you want to use unsafe code) this is the fastest, and it doesn't use additional memory.

Try this:

char[] array = { '1', '2', '3', '4' };

int[] sequence = new int[array.Length];

for (int i = 0; i < array.Length; i++)
{
    sequence[i] = int.Parse(array[i].ToString());
}

Try to convert your Char value to String before converting to Integer:

for (int i = 0; i < arr.Length; i++)
{
  sequence[i] = Convert.ToInt32(array[i].ToString());
}

iterate over your char array and use the next conversion:

char[] charArray = { '1', '2', '3', '4' };

int[] intArray= new int[charArray .Length];

for (int i = 0; i < charArray .Length; i++)
{
    intArray[i] = (int)Char.GetNumericValue(charArray[i]);   

}