如何将字节数组转换为十六进制字符串，反之亦然? [英] How do you convert a byte array to a hexadecimal string, and vice versa?

问题描述

如何将字节数组转换为十六进制字符串，反之亦然?

How can you convert a byte array to a hexadecimal string, and vice versa?

推荐答案

您可以使用 Convert.ToHexString 从 .NET 5 开始.
还有一种反向操作的方法:Convert.FromHexString.

You can use Convert.ToHexString starting with .NET 5.
There's also a method for the reverse operation: Convert.FromHexString.

对于旧版本的 .NET，您可以使用:

For older versions of .NET you can either use:

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();
}

或:

public static string ByteArrayToString(byte[] ba)
{
  return BitConverter.ToString(ba).Replace("-","");
}

还有更多的变体，例如 这里.

There are even more variants of doing it, for example here.

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;
}

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使用 Substring 是结合 Convert.ToByte 的最佳选择.有关详细信息，请参阅此答案.如果你需要更好的性能，你必须避免 Convert.ToByte 才能删除 SubString.

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Using Substring is the best option in combination with Convert.ToByte. See this answer for more information. If you need better performance, you must avoid Convert.ToByte before you can drop SubString.

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