C# 16进制与字符串、字节数组之间的转换

/// <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("
", ""); 
    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); 
}