【.NET / C#】HexConverter

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace System
{
    /// <summary> 十六进制 转换器 </summary>
    public class HexConverter
    {
        private const int RADIX = 16;

        private static readonly Regex PATTERN = new Regex("([0123456789ABCDEF]{2})+", RegexOptions.IgnoreCase);

        private static byte[] OutputBytes(string hex)
        {
            var list = new List<byte>();
            foreach (Match match in PATTERN.Matches(hex))
            {
                foreach (Capture capture in match.Groups[1].Captures)
                {
                    list.Add(Convert.ToByte(capture.Value, RADIX));
                }
            }
            return list.ToArray();
        }

        private static string OutputHexString(byte[] bits, string separator)
        {
            var result = new StringBuilder();
            for (var i = 0; i < bits.Length; i++)
            {
                if (0 != i) result.Append(separator ?? string.Empty);
                result.Append(bits[i].ToString("X2"));
            }
            return result.ToString();
        }

        #region 10 进制 -> 16 进制

        /// <summary> String -> Hex String </summary>
        public static string GetHex(string str, string separator = null)
        {
            return GetHex(str, Encoding.Default, separator);
        }

        /// <summary> String -> Hex String </summary>
        public static string GetHex(string str, Encoding encode, string separator = null)
        {
            if (!string.IsNullOrEmpty(separator))
            {
                str = str.Replace(separator, string.Empty);
            }
            var bits = encode.GetBytes(str);
            return OutputHexString(bits, separator);
        }

        /// <summary> Byte -> Hex String </summary>
        public static string GetHex(byte bit)
        {
            return bit.ToString("X2");
        }

        /// <summary> Byte[] -> Hex String </summary>
        public static string GetHex(byte[] bits, string separator = null)
        {
            return "-" == separator ? BitConverter.ToString(bits) : BitConverter.ToString(bits).Replace("-", separator ?? string.Empty);
        }

        #endregion

        #region 16 进制 -> 10 进制

        /// <summary> Hex String -> Byte[] </summary>
        public static byte[] GetBytes(string hex, string separator = null)
        {
            if (string.IsNullOrEmpty(separator))
            {
                return OutputBytes(hex);
            }
            else
            {
                var temp = hex.Split(separator);
                var result = new byte[temp.Length];
                for (var i = 0; i < temp.Length; i++)
                {
                    result[i] = Convert.ToByte(temp[i], RADIX);
                }
                return result;
            }
        }

        /// <summary> Hex String -> String </summary>
        public static string ToString(string hex, string separator = null)
        {
            return ToString(hex, Encoding.Default, separator);
        }

        /// <summary> Hex String -> String </summary>
        public static string ToString(string hex, Encoding encode, string separator = null)
        {
            if (!string.IsNullOrEmpty(separator))
            {
                hex = hex.Replace(separator, string.Empty);
            }
            var data = OutputBytes(hex);
            return encode.GetString(data);
        }

        #endregion

    }
}