Abstract
  1. 生成不重复随机数的方法
Keywords C#  Codesnippet 
Citation Yao Qing-sheng.C-16 进制与字符串、字节数组之间的转换.FUTURE & CIVILIZATION Natural/Social Philosophy & Infomation Sciences,20211027. https://yaoqs.github.io/20211027/c-16-jin-zhi-yu-zi-fu-chuan-zi-jie-shu-zu-zhi-jian-de-zhuan-huan/

16 进制与字符串、字节数组之间的转换

https://www.cnblogs.com/zoujinhua/p/11540964.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
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//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

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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);
}

字符串转 16 进制字节数组

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/// <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;
}

字节数组转 16 进制字符串

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/// <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;
}

从汉字转换到 16 进制

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/// <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();
}

16 进制转换成汉字

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///<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);
}

生成不重复随机数的方法

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public class RandomHelper
{
    /// <summary>
    ///生成制定位数的随机码（数字）
    /// </summary>
    /// <param name="length"></param>
    /// <returns></returns>
    public static string GenerateRandomCode(int length)
    {
        var result = new StringBuilder();
        for (var i = 0; i < length; i++)
        {
            var r = new Random(Guid.NewGuid().GetHashCode());
            result.Append(r.Next(0, 10));
        }
        return result.ToString();
    }
}
References

*Corresponding Author: Yao Qing-sheng <Email: 350788415@qq.com> BY-NC-SA .

  1. Yao Qing-sheng.C-16 进制与字符串、字节数组之间的转换.FUTURE & CIVILIZATION.Natural/Social Philosophy & Infomation Sciences,20211027.https://yaoqs.github.io/20211027/c-16-jin-zhi-yu-zi-fu-chuan-zi-jie-shu-zu-zhi-jian-de-zhuan-huan/
  2. 版权声明：本文为「LordYao」的原创文章，遵循 CC 4.0 BY-NC-SA 版权协议，转载请附上原文出处链接及本声明。
    原文链接： https://yaoqs.github.io/20211027/c-16-jin-zhi-yu-zi-fu-chuan-zi-jie-shu-zu-zhi-jian-de-zhuan-huan/