基本上，你有两个函数来获取一个字节数组（你称之为'十六进制字符'）到一个字符串，反之亦然：

Basically, you have two functions to get a byte array (what you call 'hexadecimal characters') to a string, and vice-versa:

using System.Text;

// Converting an UTF8 string to a byte array
string input = "whatever";
byte[] bytes = Encoding.UTF8.GetBytes(input);

// Converting a byte array back to its original string representation
string result = Encoding.UTF8.GetString(bytes);

一旦你有一个字节数组，以十六进制形式显示它的任务是微不足道的。以下是扩展方法中的示例实现：

Once you have a byte array, the task to display it in its hexadecimal form is trivial. Here's an example implementation in an extension method:

using System.Text;

public static string ToHexadecimalRepresentation(this byte[] bytes) {
   StringBuilder sb = new StringBuilder(bytes.Length << 1);
   foreach (byte b in bytes) {
      sb.AppendFormat("{0:X2}", b);
   }
   return sb.ToString();
}

希望这有帮助。

Hope this helps.