C#进制转换

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