Converting from hex to string

Question

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   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

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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

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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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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  lt  raw Length  i                  raw i    Convert ToByte hex Substring i   2  2   16             return raw

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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

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My Net 5 solution that also handles null characters at the end  hex   ConvertFromHex  hex AsSpan    Encoding Default     static string ConvertFromHex  ReadOnlySpan lt char gt  hexString  Encoding encoding         int realLength   0      for   int i   hexString Length - 2  i  gt   0  i -  2                 byte b   byte Parse  hexString Slice  i  2    NumberStyles HexNumber  CultureInfo InvariantCulture            if   b    0     not NULL character                       realLength   i   2              break                           var bytes   new byte realLength   2       for   var i   0  i  lt  bytes Length  i                   bytes i    byte Parse  hexString Slice  i   2  2    NumberStyles HexNumber  CultureInfo InvariantCulture               return encoding GetString  bytes

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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  lt  bytes Length  i                          bytes i    Convert ToByte hexString Substring i   2  2   16                      return Encoding Unicode GetString bytes      returns   Hello world  for  48656C6C6F20776F726C64

User · Answer

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             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

[c#] Converting from hex to string

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