1         public static string UnHex(string hex, string charset)
 2         {
 3             if (hex == null)
 4                 throw new ArgumentNullException("hex");
 5             hex = hex.Replace(",", "");
 6             hex = hex.Replace("/n", "");
 7             hex = hex.Replace("//", "");
 8             hex = hex.Replace(" ", "");
 9             if (hex.Length % 2 != 0)
10             {
11                 hex += "20";//空格
12             }
13             // 需要将 hex 转换成 byte 数组。 
14             byte[] bytes = new byte[hex.Length / 2];
15 
16             for (int i = 0; i < bytes.Length; i++)
17             {
18                 try
19                 {
20                     // 每两个字符是一个 byte。 
21                     bytes[i] = byte.Parse(hex.Substring(i * 2, 2),
22                     System.Globalization.NumberStyles.HexNumber);
23                 }
24                 catch
25                 {
26                     // Rethrow an exception with custom message. 
27                     throw new ArgumentException("hex is not a valid hex number!", "hex");
28                 }
29             }
30             System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
31             return chs.GetString(bytes);
32         }