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();

我喜欢将扩展方法用于这样的转换，即使它们只是包装标准库方法。在十六进制转换的情况下，我使用以下手动调优(即快速)算法:

public static string ToHex(this byte[] bytes)
{
    char[] c = new char[bytes.Length * 2];

    byte b;

    for(int bx = 0, cx = 0; bx < bytes.Length; ++bx, ++cx) 
    {
        b = ((byte)(bytes[bx] >> 4));
        c[cx] = (char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);

        b = ((byte)(bytes[bx] & 0x0F));
        c[++cx]=(char)(b > 9 ? b + 0x37 + 0x20 : b + 0x30);
    }

    return new string(c);
}

public static byte[] HexToBytes(this string str)
{
    if (str.Length == 0 || str.Length % 2 != 0)
        return new byte[0];

    byte[] buffer = new byte[str.Length / 2];
    char c;
    for (int bx = 0, sx = 0; bx < buffer.Length; ++bx, ++sx)
    {
        // Convert first half of byte
        c = str[sx];
        buffer[bx] = (byte)((c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0')) << 4);

        // Convert second half of byte
        c = str[++sx];
        buffer[bx] |= (byte)(c > '9' ? (c > 'Z' ? (c - 'a' + 10) : (c - 'A' + 10)) : (c - '0'));
    }

    return buffer;
}

:

byte[] data = new byte[] { 0x01, 0x02, 0x03, 0x0D, 0x0E, 0x0F };
string hex = string.Empty;
data.ToList().ForEach(b => hex += b.ToString("x2"));
// use "X2" for uppercase hex letters
Console.WriteLine(hex);

结果:0102030 d0e0f

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());