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C# MCQs

Which of the following is the correct way to convert a Byte Array to a Hexadecimal String, and vice versa?

static readonly char[] _hexDigits = "0123456789abcdef".ToCharArray(); public static string ToHexString(this byte[] bytes) { char[] digits = new char[bytes.Length * 2]; for (inti = 0; i<bytes.Length; i++) { int d1, d2; d1 = Math.DivRem(bytes[i], 16, out d2); digits[2 * i] = _hexDigits[d1]; digits[2 * i + 1] = _hexDigits[d2]; } return new string(digits); }

public static byte[] StringToByteArray(String hex) { intNumberChars = hex.Length/2; byte[] bytes = new byte[NumberChars]; StringReadersr = new StringReader(hex); for (inti = 0; i<NumberChars; i++) bytes[i] = Convert.ToByte(new string(new char[2]{(char)sr.Read(), (char)sr.Read()}), 16); sr.Dispose(); return bytes; }

System.Runtime.Remoting.Metadata.W3cXsd2001; public byte[] GetStringToBytes(string value) { SoapHexBinaryshb = SoapHexBinary.Parse(value); return shb.Value; } public string GetBytesToString(byte[] value) { SoapHexBinaryshb = new SoapHexBinary(value); return shb.ToString(); }

String.Join(String.Empty, Array.ConvertAll(bytes, x =>x.ToString("X2")));

Answer

Correct Answer: static readonly char[] _hexDigits = "0123456789abcdef".ToCharArray(); public static string ToHexString(this byte[] bytes) { char[] digits = new char[bytes.Length * 2]; for (inti = 0; i<bytes.Length; i++) { int d1, d2; d1 = Math.DivRem(bytes[i], 16, out d2); digits[2 * i] = _hexDigits[d1]; digits[2 * i + 1] = _hexDigits[d2]; } return new string(digits); }

Explanation:

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