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Converting from hex to string

I need to check for a string located inside a packet that I receive as byte array. If I use BitConverter.ToString(), I get the bytes as string with dashes (f.e.: 00-50-25-40-A5-FF).

I tried most functions I found after a quick googling, but most of them have input parameter type string and if I call them with the string with dashes, It throws an exception.

string

byte

BitConverter.ToString()

string

string

string

I need a function that turns hex(as string or as byte) into the string that represents the hexadecimal value(f.e.: 0x31 = 1). If the input parameter is string, the function should recognize dashes(example "47-61-74-65-77-61-79-53-65-72-76-65-72"), because BitConverter doesn't convert correctly.

string

byte

string

string

BitConverter

6 Answers
6

Like so?

static void Main()

byte data = FromHex("47-61-74-65-77-61-79-53-65-72-76-65-72");
string s = Encoding.ASCII.GetString(data); // GatewayServer

public static byte FromHex(string hex)

hex = hex.Replace("-", "");
byte raw = new byte[hex.Length / 2];
for (int i = 0; i < raw.Length; i++)

raw[i] = Convert.ToByte(hex.Substring(i * 2, 2), 16);

return raw;



string str = "47-61-74-65-77-61-79-53-65-72-76-65-72";
string parts = str.Split('-');

foreach (string val in parts)

int x;
if (int.TryParse(val, out x))

Console.Write(string.Format("0:x2 ", x);


Console.WriteLine();


You can split the string at the -

Convert the text to ints (int.TryParse)

Output the int as a hex string 0:x2

For Unicode support:

public class HexadecimalEncoding

public static string ToHexString(string str)

var sb = new StringBuilder();

var bytes = Encoding.Unicode.GetBytes(str);
foreach (var t in bytes)

sb.Append(t.ToString("X2"));


return sb.ToString(); // returns: "48656C6C6F20776F726C64" for "Hello world"


public static string FromHexString(string hexString)

var bytes = new byte[hexString.Length / 2];
for (var i = 0; i < bytes.Length; i++)

bytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);


return Encoding.Unicode.GetString(bytes); // returns: "Hello world" for "48656C6C6F20776F726C64"




Your reference to "0x31 = 1" makes me think you're actually trying to convert ASCII values to strings - in which case you should be using something like Encoding.ASCII.GetString(Byte)

If you need the result as byte array, you should pass it directly without changing it to a string, then change it back to bytes.
In your example the (f.e.: 0x31 = 1) is the ASCII codes. In that case to convert a string (of hex values) to ASCII values use:
Encoding.ASCII.GetString(byte)

0x31 = 1

Encoding.ASCII.GetString(byte)

byte data = new byte 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30 ;
string ascii=Encoding.ASCII.GetString(data);
Console.WriteLine(ascii);


The console will display: 1234567890

string hexString = "8E2";
int num = Int32.Parse(hexString, System.Globalization.NumberStyles.HexNumber);
Console.WriteLine(num);
//Output: 2274


From https://msdn.microsoft.com/en-us/library/bb311038.aspx

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