Lookup
- Text: 23,879.41 (20.8X faster)
- Sentence: 1.15 (23.9X faster)
/// <summary>
/// Hex string lookup table.
/// </summary>
private static readonly string[] HexStringTable = new string[]
{
"00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0A", "0B", "0C", "0D", "0E", "0F",
"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B", "1C", "1D", "1E", "1F",
"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F",
"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C", "3D", "3E", "3F",
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4A", "4B", "4C", "4D", "4E", "4F",
"50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5A", "5B", "5C", "5D", "5E", "5F",
"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6A", "6B", "6C", "6D", "6E", "6F",
"70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7A", "7B", "7C", "7D", "7E", "7F",
"80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8A", "8B", "8C", "8D", "8E", "8F",
"90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9A", "9B", "9C", "9D", "9E", "9F",
"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA", "AB", "AC", "AD", "AE", "AF",
"B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8", "B9", "BA", "BB", "BC", "BD", "BE", "BF",
"C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB", "CC", "CD", "CE", "CF",
"D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7", "D8", "D9", "DA", "DB", "DC", "DD", "DE", "DF",
"E0", "E1", "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB", "EC", "ED", "EE", "EF",
"F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "FA", "FB", "FC", "FD", "FE", "FF"
};
/// <summary>
/// Returns a hex string representation of an array of bytes.
/// </summary>
/// <param name="value">The array of bytes.</param>
/// <returns>A hex string representation of the array of bytes.</returns>
public static string ToHex(this byte[] value)
{
StringBuilder stringBuilder = new StringBuilder();
if (value != null)
{
foreach (byte b in value)
{
stringBuilder.Append(HexStringTable[b]);
}
}
return stringBuilder.ToString();
}
The above approach runs 25% faster than using a small hex alphabet and doing something like:
- Text: 23,201.23 (21.4X faster)
- Sentence: 1.24 (22.3X faster)
StringBuilder stringBuilder = new StringBuilder();
string hexAlphabet = "0123456789ABCDEF";
if (value != null)
{
foreach (byte b in value)
{
stringBuilder.Append(hexAlphabet[(int)(b >> 4)]);
stringBuilder.Append(hexAlphabet[(int)(b & 0xF)]);
}
}
BitConverter
- Text: 113,269.34 (4.4X faster)
- Sentence: 9.98 (2.8X faster)
public static string ByteArrayToString(byte[] ba)
{
string hex = BitConverter.ToString(ba);
return hex.Replace("-","");
}
StringBulider.AppendFormat
- Text: 672,115.77 (1.1X faster)
- Sentence: 36.82 (1.1X faster)
public static string ByteArrayToString(byte[] ba)
{
StringBuilder hex = new StringBuilder(ba.Length * 2);
foreach (byte b in ba)
hex.AppendFormat("{0:x2}", b);
return hex.ToString();
}
- Text: 718,380.63 (1.0X faster)
- Sentence: 39.71 (1.0X faster)
static string ByteArrayToHexStringViaStringBuilderAggregateAppendFormat(byte[] bytes)
{
return bytes.Aggregate(new StringBuilder(bytes.Length * 2), (sb, b) => sb.AppendFormat("{0:X2}", b)).ToString();
}
Array.ConvertAll
- Text: 752,078.70 (1.0X faster)
- Sentence: 18.28 (2.2X faster)
static string ByteArrayToHexStringViaStringConcatArrayConvertAll(byte[] bytes)
{
return string.Concat(Array.ConvertAll(bytes, b => b.ToString("X2")));
}
- Text: 675,451.57 (1.1X faster)
- Sentence: 17.95 (2.2X faster)
static string ByteArrayToHexStringViaStringJoinArrayConvertAll(byte[] bytes)
{
return string.Join(string.Empty, Array.ConvertAll(bytes, b => b.ToString("X2")));
}
{byte}.ToString("x2")
- Text: 308,805.38 (2.4X faster)
- Sentence: 16.89 (2.4X faster)
static string ByteArrayToHexStringViaStringBuilderForEachByteToString(byte[] bytes)
{
StringBuilder hex = new StringBuilder(bytes.Length * 2);
foreach (byte b in bytes)
hex.Append(b.ToString("X2"));
return hex.ToString();
}
- Text: 352,828.20 (2.1X faster)
- Sentence: 16.87 (2.4X faster)
static string ByteArrayToHexStringViaStringBuilderAggregateByteToString(byte[] bytes)
{
return bytes.Aggregate(new StringBuilder(bytes.Length * 2), (sb, b) => sb.Append(b.ToString("X2"))).ToString();
}
{SoapHexBinary}.ToString()
static string ByteArrayToHexViaSoapHexBinary(byte[] bytes)
{
SoapHexBinary soapHexBinary = new SoapHexBinary(bytes);
return soapHexBinary.ToString();
}
Byte Manipulation
- Text: 16,856.64 (29.5X faster)
- Sentence: 0.70 (39.5X faster)
static string ByteArrayToHexViaByteManipulation(byte[] bytes)
{
char[] c = new char[bytes.Length * 2];
byte b;
for (int i = 0; i < bytes.Length; i++)
{
b = ((byte)(bytes[i] >> 4));
c[i * 2] = (char)(b > 9 ? b + 0x37 : b + 0x30);
b = ((byte)(bytes[i] & 0xF));
c[i * 2 + 1] = (char)(b > 9 ? b + 0x37 : b + 0x30);
}
return new string(c);
}
- Text: 12,967.69 (38.4X faster)
- Sentence: 0.73 (37.9X faster)
static string ByteArrayToHexViaByteManipulation2(byte[] bytes)
{
char[] c = new char[bytes.Length * 2];
int b;
for (int i = 0; i < bytes.Length; i++)
{
b = bytes[i] >> 4;
c[i * 2] = (char)(55 + b + (((b - 10) >> 31) & -7));
b = bytes[i] & 0xF;
c[i * 2 + 1] = (char)(55 + b + (((b - 10) >> 31) & -7));
}
return new string(c);
}
Quote From
How do you convert Byte Array to Hexadecimal String, and vice versa
byte[] to hex string
blambert/codesnip – Fast byte array to hex string conversion
时间： 2024-10-13 07:29:06