C# 16进制与字符串、字节数组之间的转换

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>

private
static byte[] strToToHexByte(string hexString)

{

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);

return returnBytes;

}

/// <summary>

/// 字节数组转16进制字符串

///
</summary>

///
<param name="bytes"></param>

///
<returns></returns>

public
static string 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>

public
static string 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();

}

///<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>

public
static string UnHex(string hex,
string charset)

{

if (hex
== null)

throw
new 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
= new
byte[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.

throw
new ArgumentException("hex is not a valid hex number!",
"hex");

}

}

System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);

return chs.GetString(bytes);

}

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