16进制与字符串、字节数组之间的转换（一）

  1 1.请问c#中如何将十进制数的字符串转化成十六进制数的字符串  
  2   
  3 //十进制转二进制  
  4 Console.WriteLine("十进制166的二进制表示: "+Convert.ToString(166, 2));  
  5 //十进制转八进制  
  6 Console.WriteLine("十进制166的八进制表示: "+Convert.ToString(166, 8));  
  7 //十进制转十六进制  
  8 Console.WriteLine("十进制166的十六进制表示: "+Convert.ToString(166, 16));  
  9       
 10 //二进制转十进制  
 11 Console.WriteLine("二进制 111101 的十进制表示: "+Convert.ToInt32("111101", 2));  
 12 //八进制转十进制  
 13 Console.WriteLine("八进制 44 的十进制表示: "+Convert.ToInt32("44", 8));  
 14 //十六进制转十进制  
 15 Console.WriteLine("十六进制 CC的十进制表示: "+Convert.ToInt32("CC", 16));  
 16   
 17 2.在串口通讯过程中，经常要用到 16进制与字符串、字节数组之间的转换  
 18 //  
 19   
 20 private string StringToHexString(string s,Encoding encode)  
 21         {  
 22             byte[] b = encode.GetBytes(s);//按照指定编码将string编程字节数组  
 23             string result = string.Empty;  
 24             for (int i = 0; i < b.Length; i++)//逐字节变为16进制字符，以%隔开  
 25             {  
 26                 result += "%"+Convert.ToString(b[i], 16);  
 27             }  
 28             return result;  
 29         }  
 30         private string HexStringToString(string hs, Encoding encode)  
 31         {  
 32             //以%分割字符串，并去掉空字符  
 33             string[] chars = hs.Split(new char[]{'%'},StringSplitOptions.RemoveEmptyEntries);  
 34             byte[] b = new byte[chars.Length];  
 35             //逐个字符变为16进制字节数据  
 36             for (int i = 0; i < chars.Length; i++)  
 37             {  
 38                 b[i] = Convert.ToByte(chars[i], 16);  
 39             }  
 40             //按照指定编码将字节数组变为字符串  
 41             return encode.GetString(b);  
 42         }  
 43   
 44    
 45   
 46   
 47         /// <summary>  
 48         /// 字符串转16进制字节数组  
 49         /// </summary>  
 50        /// <param name="hexString"></param>  
 51         /// <returns></returns>  
 52         private static byte[] strToToHexByte(string hexString)  
 53         {  
 54              hexString = hexString.Replace(" ", "");  
 55            if ((hexString.Length % 2) != 0)  
 56                  hexString += " ";  
 57             byte[] returnBytes = new byte[hexString.Length / 2];  
 58             for (int i = 0; i < returnBytes.Length; i++)  
 59                 returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);  
 60             return returnBytes;  
 61          }  
 62    
 63   
 64    
 65   
 66   
 67 /// <summary>  
 68         /// 字节数组转16进制字符串  
 69         /// </summary>  
 70         /// <param name="bytes"></param>  
 71         /// <returns></returns>  
 72         public static string byteToHexStr(byte[] bytes)  
 73        {  
 74             string returnStr = "";  
 75             if (bytes != null)  
 76             {  
 77                 for (int i = 0; i < bytes.Length; i++)  
 78                 {  
 79                      returnStr += bytes[i].ToString("X2");  
 80                  }  
 81              }  
 82             return returnStr;  
 83          }  
 84    
 85   
 86    
 87   
 88   
 89 /// <summary>  
 90         /// 从汉字转换到16进制  
 91         /// </summary>  
 92         /// <param name="s"></param>  
 93         /// <param name="charset">编码,如"utf-8","gb2312"</param>  
 94         /// <param name="fenge">是否每字符用逗号分隔</param>  
 95        /// <returns></returns>  
 96         public static string ToHex(string s, string charset, bool fenge)  
 97         {  
 98             if ((s.Length % 2) != 0)  
 99             {  
100                  s += " ";//空格  
101                 //throw new ArgumentException("s is not valid chinese string!");  
102              }  
103              System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);  
104             byte[] bytes = chs.GetBytes(s);  
105             string str = "";  
106             for (int i = 0; i < bytes.Length; i++)  
107             {  
108                 str += string.Format("{0:X}", bytes[i]);  
109                 if (fenge && (i != bytes.Length - 1))  
110                 {  
111                      str += string.Format("{0}", ",");  
112                  }  
113              }  
114             return str.ToLower();  
115          }  
116    
117   
118    
119   
120   
121 ///<summary>  
122         /// 从16进制转换成汉字  
123         /// </summary>  
124         /// <param name="hex"></param>  
125         /// <param name="charset">编码,如"utf-8","gb2312"</param>  
126        /// <returns></returns>  
127         public static string UnHex(string hex, string charset)  
128         {  
129            if (hex == null)  
130                 throw new ArgumentNullException("hex");  
131              hex = hex.Replace(",", "");  
132              hex = hex.Replace("\n", "");  
133              hex = hex.Replace("\\", "");  
134              hex = hex.Replace(" ", "");  
135             if (hex.Length % 2 != 0)  
136             {  
137                  hex += "20";//空格  
138              }  
139             // 需要将 hex 转换成 byte 数组。   
140             byte[] bytes = new byte[hex.Length / 2];  
141   
142            for (int i = 0; i < bytes.Length; i++)  
143             {  
144                 try  
145                 {  
146                     // 每两个字符是一个 byte。   
147                      bytes[i] = byte.Parse(hex.Substring(i * 2, 2),  
148                      System.Globalization.NumberStyles.HexNumber);  
149                  }  
150                 catch  
151                 {  
152                     // Rethrow an exception with custom message.   
153                     throw new ArgumentException("hex is not a valid hex number!", "hex");  
154                  }  
155              }  
156              System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);  
157             return chs.GetString(bytes);  
158          }