我想我做了一个更快的字节数组到字符串转换器:

public static class HexTable
{
    private static readonly string[] table = BitConverter.ToString(Enumerable.Range(0, 256).Select(x => (byte)x).ToArray()).Split('-');

    public static string ToHexTable(byte[] value)
    {
        StringBuilder sb = new StringBuilder(2 * value.Length);

        for (int i = 0; i < value.Length; i++)
            sb.Append(table[value[i]]);

        return sb.ToString();
    }

并且测试设置:

static void Main(string[] args)
{
        const int TEST_COUNT = 10000;
        const int BUFFER_LENGTH = 100000;

        Random random = new Random();

        Stopwatch sw = new Stopwatch();
        Stopwatch sw2 = new Stopwatch();

        byte[] buffer = new byte[BUFFER_LENGTH];
        random.NextBytes(buffer);

        sw.Start();
        for (int j = 0; j < TEST_COUNT; j++)
            HexTable.ToHexTable(buffer);

        sw.Stop();

        sw2.Start();
        for (int j = 0; j < TEST_COUNT; j++)
            ToHexChar.ToHex(buffer);

        sw2.Stop();

        Console.WriteLine("Hex Table Elapsed Milliseconds: {0}", sw.ElapsedMilliseconds);
        Console.WriteLine("ToHex Elapsed Milliseconds: {0}", sw2.ElapsedMilliseconds);
    }

ToHexChar.ToHEx()方法是前面所示的ToHex()方法。

结果如下:

HexTable = 11808 ms ToHEx = 12168ms

它看起来可能没有太大的不同，但它仍然更快:)

我不经常把字节转换成十六进制所以我不知道有没有更好的方法，但这里有一种方法。

StringBuilder sb = new StringBuilder();
foreach (byte b in myByteArray)
    sb.Append(b.ToString("X2"));

string hexString = sb.ToString();

private static string GuidToRaw(Guid guid)
{
    byte[] bytes = guid.ToByteArray();

    int сharCount = bytes.Length * 2;
    char[] chars = new char[сharCount];

    int index = 0;
    for (int i = 0; i < сharCount; i += 2)
    {
        byte b = bytes[index++];
        chars[i] = GetHexValue((int)(b / 16));
        chars[i + 1] = GetHexValue((int)(b % 16));
    }
    return new string(chars, 0, chars.Length);
}

private static char GetHexValue(int i)
{
    return (char)(i < 10 ? i + 48 : i + 55);
}

我不确定你是否需要这样做的性能，但这里是最快的方法转换字节[]到十六进制字符串，我能想到:

static readonly char[] hexchar = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
public static string HexStr(byte[] data, int offset, int len, bool space = false)
{
    int i = 0, k = 2;
    if (space) k++;
    var c = new char[len * k];
    while (i < len)
    {
        byte d = data[offset + i];
        c[i * k] = hexchar[d / 0x10];
        c[i * k + 1] = hexchar[d % 0x10];
        if (space && i < len - 1) c[i * k + 2] = ' ';
        i++;
    }
    return new string(c, 0, c.Length);
}

你把LINQ和字符串方法结合起来:

string hex = string.Join("",
  bin.Select(
    bin => bin.ToString("X2")
      ).ToArray());

再向这个堆中添加一个答案，有一个System.Runtime.Remoting.Metadata.W3cXsd2001。SoapHexBinary类，我已经使用它可以转换字节和十六进制:

string hex = new SoapHexBinary(bytes).ToString();
byte[] bytes = SoapHexBinary.Parse(hex).Value;

不确定它与其他实现(基准)相比如何，但在我看来，它非常简单——特别是从十六进制转换回字节。