我想我应该给出一个答案。从我的测试来看，这种方法是最快的

public static class Helper
{
    public static string[] HexTbl = Enumerable.Range(0, 256).Select(v => v.ToString("X2")).ToArray();
    public static string ToHex(this IEnumerable<byte> array)
    {
        StringBuilder s = new StringBuilder();
        foreach (var v in array)
            s.Append(HexTbl[v]);
        return s.ToString();
    }
    public static string ToHex(this byte[] array)
    {
        StringBuilder s = new StringBuilder(array.Length*2);
        foreach (var v in array)
            s.Append(HexTbl[v]);
        return s.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);
}

用LINQ做这件事的好方法…

var data = new byte[] { 1, 2, 4, 8, 16, 32 }; 
var hexString = data.Aggregate(new StringBuilder(), 
                               (sb,v)=>sb.Append(v.ToString("X2"))
                              ).ToString();

有一个内置的方法:

byte[] data = { 1, 2, 4, 8, 16, 32 };

string hex = BitConverter.ToString(data);

结果:01-02-04-08-10-20

如果你想要没有破折号，只需删除它们:

string hex = BitConverter.ToString(data).Replace("-", string.Empty);

结果:010204081020

如果你想要一个更紧凑的表示，你可以使用Base64:

string base64 = Convert.ToBase64String(data);

结果:AQIECBAg

我想我应该给出一个答案。从我的测试来看，这种方法是最快的

public static class Helper
{
    public static string[] HexTbl = Enumerable.Range(0, 256).Select(v => v.ToString("X2")).ToArray();
    public static string ToHex(this IEnumerable<byte> array)
    {
        StringBuilder s = new StringBuilder();
        foreach (var v in array)
            s.Append(HexTbl[v]);
        return s.ToString();
    }
    public static string ToHex(this byte[] array)
    {
        StringBuilder s = new StringBuilder(array.Length*2);
        foreach (var v in array)
            s.Append(HexTbl[v]);
        return s.ToString();
    }
}

:

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