原文 http://www.cnblogs.com/gaole/archive/2013/09/18/3328810.html
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
//十进制转二进制
Console.WriteLine("十进制166的二进制表示: "+Convert.ToString(166, 2));
//十进制转八进制
Console.WriteLine("十进制166的八进制表示: "+Convert.ToString(166, 8));
//十进制转十六进制
Console.WriteLine("十进制166的十六进制表示: "+Convert.ToString(166, 16));
//二进制转十进制
Console.WriteLine("二进制 111101 的十进制表示: "+Convert.ToInt32("111101", 2));
//八进制转十进制
Console.WriteLine("八进制 44 的十进制表示: "+Convert.ToInt32("44", 8));
//十六进制转十进制
Console.WriteLine("十六进制 CC的十进制表示: "+Convert.ToInt32("CC", 16));
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
//
private string StringToHexString(string s,Encoding encode)
{
byte[] b = encode.GetBytes(s);//按照指定编码将string编程字节数组
string result = string.Empty;
for (int i = 0; i < b.Length; i++)//逐字节变为16进制字符，以%隔开
{
result += "%"+Convert.ToString(b[i], 16);
}
return result;
}
private string HexStringToString(string hs, Encoding encode)
{
//以%分割字符串，并去掉空字符
string[] chars = hs.Split(new char[]{'%'},StringSplitOptions.RemoveEmptyEntries);
byte[] b = new byte[chars.Length];
//逐个字符变为16进制字节数据
for (int i = 0; i < chars.Length; i++)
{
b[i] = Convert.ToByte(chars[i], 16);
}
//按照指定编码将字节数组变为字符串
return encode.GetString(b);
}
///<summary>
/// 字符串转16进制字节数组
///</summary>
///<param name="hexString"></param>
///<returns></returns>
privatestaticbyte[] strToToHexByte(string hexString)
{
hexString = hexString.Replace("", "");
if ((hexString.Length %2) !=0)
hexString +="";
byte[] returnBytes =newbyte[hexString.Length /2];
for (int i =0; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i *2, 2), 16);
return returnBytes;
}
///<summary>
/// 字节数组转16进制字符串
///</summary>
///<param name="bytes"></param>
///<returns></returns>
publicstaticstring byteToHexStr(byte[] bytes)
{
string returnStr ="";
if (bytes !=null)
{
for (int i =0; i < bytes.Length; i++)
{
returnStr += bytes[i].ToString("X2");
}
}
return returnStr;
}
///<summary>
/// 从汉字转换到16进制
///</summary>
///<param name="s"></param>
///<param name="charset">编码,如"utf-8","gb2312"</param>
///<param name="fenge">是否每字符用逗号分隔</param>
///<returns></returns>
publicstaticstring ToHex(string s, string charset, bool fenge)
{
if ((s.Length %2) !=0)
{
s +="";//空格
//throw new ArgumentException("s is not valid chinese string!");
}
System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
byte[] bytes = chs.GetBytes(s);
string str ="";
for (int i =0; i < bytes.Length; i++)
{
str +=string.Format("{0:X}", bytes[i]);
if (fenge && (i != bytes.Length -1))
{
str +=string.Format("{0}", ",");
}
}
return str.ToLower();
}
16进制转换成汉字
///<summary>
/// 从16进制转换成汉字
///</summary>
///<param name="hex"></param>
///<param name="charset">编码,如"utf-8","gb2312"</param>
///<returns></returns>
publicstaticstring UnHex(string hex, string charset)
{
if (hex ==null)
thrownew ArgumentNullException("hex");
hex = hex.Replace(",", "");
hex = hex.Replace("\n", "");
hex = hex.Replace("\\", "");
hex = hex.Replace("", "");
if (hex.Length %2!=0)
{
hex +="20";//空格
}
// 需要将 hex 转换成 byte 数组。
byte[] bytes =newbyte[hex.Length /2];
for (int i =0; i < bytes.Length; i++)
{
try
{
// 每两个字符是一个 byte。
bytes[i] =byte.Parse(hex.Substring(i *2, 2),
System.Globalization.NumberStyles.HexNumber);
}
catch
{
// Rethrow an exception with custom message.
thrownew ArgumentException("hex is not a valid hex number!", "hex");
}
}
System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
return chs.GetString(bytes);
}
/// <summary>
/// 字符串转16进制字节数组
/// </summary>
/// <param name="hexString"></param>
/// <returns></returns>
private static byte[] strToToHexByte(string hexString = "00445255303231323334233030303126313231313031313331352631323131303131333235263130233030303226313231313031313331372631323131303131333339263237")
{
hexString = hexString.Replace(" ", "");
if ((hexString.Length % 2) != 0)
hexString += " ";
byte[] returnBytes = new byte[hexString.Length / 2];
for (int i = 0; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
Decoder dest = Encoding.GetEncoding("gb2312").GetDecoder();
char[] rst = new char[hexString.Length / 2];
dest.GetChars(returnBytes, 0, returnBytes.Length, rst, 0);
string aa = new string(rst);
return returnBytes;
}
