c#实现16进制和字符串之间转换

方式一：

//字符串转16进制

string input = "Hello World!";
char[] values = input.ToCharArray();
foreach (char letter in values)
{
// Get the integral value of the character.
int value = Convert.ToInt32(letter);
// Convert the decimal value to a hexadecimal value in string form.
string hexOutput = String.Format("{0:X}", value);
Console.WriteLine("Hexadecimal value of {0} is {1}", letter, hexOutput);
}

//16进制转字符

string hexValues = "48 65 6C 6C 6F 20 57 6F 72 6C 64 21";
string[] hexValuesSplit = hexValues.Split(' ');
foreach (String hex in hexValuesSplit)
{
// Convert the number expressed in base-16 to an integer.
int value = Convert.ToInt32(hex, 16);

//也可以这样转换int value = Int32.Parse(hex, System.Globalization.NumberStyles.HexNumber);

// Get the character corresponding to the integral value.
string stringValue = Char.ConvertFromUtf32(value);
char charValue = (char)value;
Console.WriteLine("hexadecimal value = {0}, int value = {1}, char value = {2} or {3}",
hex, value, stringValue, charValue);
}

方式二：

public string StrToHex(string mStr) //返回处理后的十六进制字符串
{
return BitConverter.ToString(
ASCIIEncoding.Default.GetBytes(mStr)).Replace("-", " ");
} /* StrToHex */
public string HexToStr(string mHex) // 返回十六进制代表的字符串
{
mHex = mHex.Replace(" ", "");
if (mHex.Length <= 0) return "";
byte[] vBytes = new byte[mHex.Length / 2];
for (int i = 0; i < mHex.Length; i += 2)
if (!byte.TryParse(mHex.Substring(i, 2), NumberStyles.HexNumber, null, out vBytes[i / 2]))
vBytes[i / 2] = 0;
return ASCIIEncoding.Default.GetString(vBytes);
} /* HexToStr *

 

 

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>
        privatestatic 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>
        publicstatic 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>
        publicstatic 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>
        publicstatic 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.
                    thrownew 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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