How to convert a string to ASCII

Question

How do I convert each letter in a string to its ASCII character value?

Each letter is already it's ASCII character value. – Hot Licks Jan 24 '13 at 03:55 — Hot Licks, Jan 24 '13 at 03:55

score 30 · Answer 1 · answered Mar 18 '11 at 07:31

.NET stores all strings as a sequence of UTF-16 code units. (This is close enough to "Unicode characters" for most purposes.)

Fortunately for you, Unicode was designed such that ASCII values map to the same number in Unicode, so after you've converted each character to an integer, you can just check whether it's in the ASCII range. Note that you can use an implicit conversion from char to int - there's no need to call a conversion method:

string text = "Here's some text including a \u00ff non-ASCII character";
foreach (char c in text)
{
    int unicode = c;
    Console.WriteLine(unicode < 128 ? "ASCII: {0}" : "Non-ASCII: {0}", unicode);
}

score 24 · Accepted Answer · edited Feb 03 '19 at 10:33

24

For Any String try this:

string s = Console.ReadLine();
foreach( char c in s)
{
    Console.WriteLine(System.Convert.ToInt32(c));
}
Console.ReadKey();

edited Feb 03 '19 at 10:33

Simon

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answered Mar 18 '11 at 06:36

Student

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what if the string has unicode chars ,what does above code print? – Srinivas Reddy Thatiparthy Mar 18 '11 at 06:51
1

@Srinivas: See my answer for more details - and an alternative to calling Convert.ToInt32. – Jon Skeet Mar 18 '11 at 07:31

score 4 · Answer 3 · answered Oct 16 '18 at 09:44

Try Linq:

Result = string.Join("", input.ToCharArray().Where(x=> ((int)x) < 127));

This will filter out all non ascii characters. Now if you want an equivalent, try the following:

Result = string.Join("", System.Text.Encoding.ASCII.GetChars(System.Text.Encoding.ASCII.GetBytes(input.ToCharArray())));

score 2 · Answer 4 · answered Mar 27 '22 at 11:10

byte[] bytes = Encoding.ASCII.GetBytes(inputString);

In the ASCII enconding each char is represented with 1 byte, however in C# the string type uses 2 bytes per char.

Hence, if you want to keep an ASCII "string" in memory, the most efficient way is to use a byte array. You can always convert it back to string, but remember it will double in size in memory!

string value = new ASCIIEncoding().GetString(bytes);

score 1 · Answer 5 · edited Jul 17 '14 at 15:35

1

I think this code may be help you:

string str = char.ConvertFromUtf32(65)

edited Jul 17 '14 at 15:35

Peter Mortensen

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answered Mar 18 '11 at 06:42

r12

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you should adapt your answer! – Mar 18 '11 at 08:21
1

Although it did not answer the original question, it was exactly what I needed. Thank you very much for your wrong post. – Xlaech Jun 19 '15 at 10:05

score 0 · Answer 6 · edited Jul 17 '14 at 15:37

0

Use Convert.ToInt32() for conversion. You can have a look at How to convert string to ASCII value in C# and ASCII values.

edited Jul 17 '14 at 15:37

Peter Mortensen

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answered Mar 18 '11 at 06:43

Akshatha

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There's no need to call a method. There's an implicit conversion from `char` to `int`. – Jon Skeet Mar 18 '11 at 07:31

score 0 · Answer 7 · answered Jul 02 '20 at 00:04

You can do it by using LINQ-expression.

  public static List<int> StringToAscii(string value)
  {
        if (string.IsNullOrEmpty(value))
            throw new ArgumentException("Value cannot be null or empty.", nameof(value));

        return value.Select(System.Convert.ToInt32).ToList();
  }

score 0 · Answer 8 · answered Mar 31 '21 at 07:36

Here is an extension method based on Jon Skeet's answer:

    public static string ConvertUnicodeStringToAscii(this string text)
    {
        var sb = new StringBuilder();
        foreach (char c in text)
        {
            int unicode = c;
            if (unicode < 128)
            {
                sb.Append(c);
            }
        }
        return sb.ToString();
    }

How to convert a string to ASCII

8 Answers8

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