C# 16進制與字符串、字節數組之間的轉換 （轉載）

1.請問c#中如何將十進制數的字符串轉化成十六進制數的字符串

//十進制轉二進制 
Console.WriteLine("十進制166的二進制表示: "+Convert.ToString(166, 2));
//十進制轉八進制 
Console.WriteLine("十進制166的八進制表示: "+Convert.ToString(166, 8)); 
//十進制轉十六進制 Console.WriteLine("十進制166的十六進制表示: "+Convert.ToString(166, 16));  
//二進制轉十進制 
Console.WriteLine("二進制 111101 的十進制表示: "+Convert.ToInt32("111101", 2));
//八進制轉十進制
Console.WriteLine("八進制 44 的十進制表示: "+Convert.ToInt32("44", 8)); 
//十六進制轉十進制
Console.WriteLine("十六進制 CC的十進制表示: "+Convert.ToInt32("CC", 16)); 

 

2.在串口通信過程當中，常常要用到 16進制與字符串、字節數組之間的轉換

private string StringToHexString(string s, Encoding encode)
{
    byte[] b = encode.GetBytes(s);//按照指定編碼將string編程字節數組
    string result = string.Empty;
    for (int i = 0; i < b.Length; i++)//逐字節變爲16進制字符，以%隔開
    {
        result += "%" + Convert.ToString(b[i], 16);
    }
    return result;
}

private string HexStringToString(string hs, Encoding encode)
{
    //以%分割字符串，並去掉空字符
    string[] chars = hs.Split(new char[] { '%' }, StringSplitOptions.RemoveEmptyEntries);
    byte[] b = new byte[chars.Length];
    //逐個字符變爲16進制字節數據
    for (int i = 0; i < chars.Length; i++)
    {
        b[i] = Convert.ToByte(chars[i], 16);
    }
    //按照指定編碼將字節數組變爲字符串
    return encode.GetString(b);
}

 

字符串轉16進制字節數組

/// <summary>
/// 字符串轉16進制字節數組
/// </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;
}

 

字節數組轉16進制字符串

/// <summary>
/// 字節數組轉16進制字符串
/// </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;
}

 

從漢字轉換到16進制

/// <summary>
/// 從漢字轉換到16進制
/// </summary>
/// <param name="s"></param>
/// <param name="charset">編碼,如"utf-8","gb2312"</param>
/// <param name="fenge">是否每字符用逗號分隔</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();
}

 

16進制轉換成漢字

///<summary>
/// 從16進制轉換成漢字
/// </summary>
/// <param name="hex"></param>
/// <param name="charset">編碼,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
    }
    // 須要將 hex 轉換成 byte 數組。 
    byte[] bytes = new byte[hex.Length / 2];

    for (int i = 0; i < bytes.Length; i++)
    {
        try
        {
            // 每兩個字符是一個 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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