Is there a simple way to re-cast a char[] array as Int32[]?

Question

I'm working on a C# program to scrub extended ASCII characters (examples are in my input string) from a series of text files. Here's what I'm running into. While I can recast the char as Int32 in my for loop, I'm trying to see if there's any way, to re-cast the array as Int32 values? In a perfect world, I'd like to pass an Int32 array of rocessing methods directly. Right now, I'm planning on just creating a method that takes the char array and returns an Int32 array. Is there an easier way to do this that would be similar to the comment I've included in my code?

string value = "Slide™1½”C4®";
byte[] asciiValue = Encoding.ASCII.GetBytes(value);   // byte array
char[] array = value.ToCharArray();                   // char array
 /* 
    is there something like
       Int32[] int32Array = array[].ToInt32();
 */
Console.WriteLine("CHAR\tBYTE\tINT32"); 
for (int i = 0; i < array.Length; i++) {
    char  letter     = array[i];
    byte  byteValue  = asciiValue[i];
    Int32 int32Value = array[i];
     /* 
        ... evaluate int32Value and do stuff ...  
     */
    Console.WriteLine("{0}\t{1}\t{2}", letter, byteValue, int32Value);
}
Console.ReadLine();

My plan B:

private Int32[] RecastCharArray(char[] array)
{
    Int32[] int32Value ;
    for (int i = 0; i < array.Length; i++) {
         int32Value[i] = array[i];
    }
    return int32Value;
}

See http://stackoverflow.com/questions/23224360/why-are-ascii-values-of-a-byte-different-when-cast-as-int32. I need to be able to differentiate the four different characters that are showing up with a byte value of 63. — dwwilson66, Apr 22 '14 at 15:54

Habib · Answer 1 · 2014-04-22T15:53:03.597

2

You can use LINQ.

char[] array = new char[] { 'a', 'b', 'c', '1', '2', '3' };
int[] int32Value = array.Select(r=> (int) r).ToArray();

If you want to convert numeric characters to int like changing character '1' to digit 1 then you can do:

char[] array = new char[] { '1', '2', '3', '4' };
int[] intArray = array.Where(char.IsDigit)
                      .Select(r => (int) char.GetNumericValue(r))
                      .ToArray();

This will give you the numeric representation not the ASCII value.

edited Apr 22 '14 at 15:53

answered Apr 22 '14 at 15:46

Habib

219,104
29
407
436

I'm too slow for you guys :( – Recipe Apr 22 '14 at 15:53
Why does Select with an explicit cast in it work, and Cast does not? – kat0r Apr 22 '14 at 15:53
@kat0r, not really sure. I thought about it first but when I tried I got the exception. – Habib Apr 22 '14 at 15:54
1

@kat0r, [this answer](http://stackoverflow.com/a/445497/961113) seems to answer your question. – Habib Apr 22 '14 at 15:55
Thanks, was just writing my own question. That is really annoying behaviour, though. – kat0r Apr 22 '14 at 15:57

score 0 · Answer 2 · answered Apr 22 '14 at 15:46

0

Using LINQ ?

char[] array = value.ToCharArray(); 
int[] newarray = array.Select(c => (int)c).ToArray();

answered Apr 22 '14 at 15:46

Parimal Raj

20,189
9
73
110

score 0 · Answer 3 · answered Apr 22 '14 at 15:47

0

You can use Array.ConvertAll:

int[] ints = Array.ConvertAll<char, int>(chars, c => (int) c);

answered Apr 22 '14 at 15:47

Tim Schmelter

450,073
74
686
939

Is there a simple way to re-cast a char[] array as Int32[]?

3 Answers3