如何将字节数组转换为十六进制字符串,反之亦然?
当前回答
这可以从字符串到字节数组。。。
public static byte[] StrToByteArray(string str)
{
Dictionary<string, byte> hexindex = new Dictionary<string, byte>();
for (byte i = 0; i < 255; i++)
hexindex.Add(i.ToString("X2"), i);
List<byte> hexres = new List<byte>();
for (int i = 0; i < str.Length; i += 2)
hexres.Add(hexindex[str.Substring(i, 2)]);
return hexres.ToArray();
}
其他回答
您可以使用BitConverter.ToString方法:
byte[] bytes = {0, 1, 2, 4, 8, 16, 32, 64, 128, 256}
Console.WriteLine( BitConverter.ToString(bytes));
输出:
00-01-02-04-08-10-20-40-80-FF
更多信息:BitConverter.ToString方法(Byte[])
下面还通过允许本机小写选项扩展了这里的优秀答案,并且还处理null或空输入,并使其成为扩展方法。
/// <summary>
/// Converts the byte array to a hex string very fast. Excellent job
/// with code lightly adapted from 'community wiki' here: https://stackoverflow.com/a/14333437/264031
/// (the function was originally named: ByteToHexBitFiddle). Now allows a native lowerCase option
/// to be input and allows null or empty inputs (null returns null, empty returns empty).
/// </summary>
public static string ToHexString(this byte[] bytes, bool lowerCase = false)
{
if (bytes == null)
return null;
else if (bytes.Length == 0)
return "";
char[] c = new char[bytes.Length * 2];
int b;
int xAddToAlpha = lowerCase ? 87 : 55;
int xAddToDigit = lowerCase ? -39 : -7;
for (int i = 0; i < bytes.Length; i++) {
b = bytes[i] >> 4;
c[i * 2] = (char)(xAddToAlpha + b + (((b - 10) >> 31) & xAddToDigit));
b = bytes[i] & 0xF;
c[i * 2 + 1] = (char)(xAddToAlpha + b + (((b - 10) >> 31) & xAddToDigit));
}
string val = new string(c);
return val;
}
public static string ToHexString(this IEnumerable<byte> bytes, bool lowerCase = false)
{
if (bytes == null)
return null;
byte[] arr = bytes.ToArray();
return arr.ToHexString(lowerCase);
}
可以使用从.NET 5开始的Convert.ToHexString。还有一个用于反向操作的方法:Convert.FromHexString。
对于较旧版本的.NET,您可以使用:
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();
}
or:
public static string ByteArrayToString(byte[] ba)
{
return BitConverter.ToString(ba).Replace("-","");
}
举个例子,这里有更多的方法。
反向转换如下:
public static byte[] StringToByteArray(String hex)
{
int NumberChars = hex.Length;
byte[] bytes = new byte[NumberChars / 2];
for (int i = 0; i < NumberChars; i += 2)
bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
return bytes;
}
使用Substring是与Convert.ToByte结合使用的最佳选项。有关详细信息,请参阅此答案。如果需要更好的性能,必须避免Convert.ToByte,然后才能删除SubString。
我猜它的速度值16个额外的字节。
static char[] hexes = new char[]{'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
public static string ToHexadecimal (this byte[] Bytes)
{
char[] Result = new char[Bytes.Length << 1];
int Offset = 0;
for (int i = 0; i != Bytes.Length; i++) {
Result[Offset++] = hexes[Bytes[i] >> 4];
Result[Offset++] = hexes[Bytes[i] & 0x0F];
}
return new string(Result);
}
支持最短路径和.net核心:
public static string BytesToString(byte[] ba) =>
ba.Aggregate(new StringBuilder(32), (sb, b) => sb.Append(b.ToString("X2"))).ToString();