C#进制转换操作（三）之16进制操作

蔚落 2022-07-12 14:07 429阅读 0赞

**一、字符串和16进制字符串互转**

1.字符串转16进制字符串

/// <summary>  
    /// 字符串转Hex,方法1使用Convert.ToString(byte, 16)
    /// </summary>  
    /// <param name="str"></param>  
    /// <returns></returns>  
    public static string StringToHex(string str)
    {
        StringBuilder sb = new StringBuilder();
        byte[] byStr = System.Text.Encoding.Default.GetBytes(str); //默认是System.Text.Encoding.Default.GetBytes(str)  
        for (int i = 0; i < byStr.Length; i++)
        {
            sb.Append(Convert.ToString(byStr[i], 16));
        }
        return (sb.ToString().ToUpper());
    }
    /// <summary>
    /// 字符串转Hex，方法2使用BitConverter
    /// </summary>
    /// <param name="mStr"></param>
    /// <returns></returns>
    public static string StrToHex(string mStr) //返回处理后的十六进制字符串
    {
        return BitConverter.ToString(
        Encoding.Default.GetBytes(mStr)).Replace("-", " ");
    
        //return BitConverter.ToString(
        //ASCIIEncoding.Default.GetBytes(mStr)).Replace("-", " ");
    }

2.16进制字符串转字符串

/// <summary>
    /// 返回十六进制代表的字符串
    /// </summary>
    /// <param name="mHex"></param>
    /// <returns></returns>
    public static string HexToString(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 Encoding.Unicode.GetString(vBytes);
        //return Encoding.UTF8.GetString(vBytes);
        // return Encoding.Default.GetString(vBytes);
        //return Encoding.ASCII.GetString(vBytes);
        return Encoding.UTF7.GetString(vBytes);
        // return ASCIIEncoding.Default.GetString(vBytes);
    }

使用实例：

/*
        *  特别说明：字符串和十六进制之间的转换需要使用相同的字符集才能识别
        */ 
    Console.WriteLine(StringToHex("张三ABC"));//D5C5C8FD414243
    Console.WriteLine(StrToHex("张三ABC")); //D5 C5 C8 FD 41 42 43
    Console.WriteLine(HexToString("D5C5C8FD414243")); //张三ABC

**二、字节数组转十六进制字符串，使用BitCoinverter类**

byte[] vals = { 0x01, 0xAA, 0xB1, 0xDC, 0x10, 0xDD };
    string str = BitConverter.ToString(vals);
    Console.WriteLine(str);
    str = BitConverter.ToString(vals).Replace("-", "");
    Console.WriteLine(str);

/\*Output:   
01-AA-B1-DC-10-DD   
01AAB1DC10DD   
\*/

**三、十六进制 string 转换为浮点型，转换为整数**

1.十六进制字符串转整数

string hexString = "8E2";
    int num = Int32.Parse(hexString, System.Globalization.NumberStyles.HexNumber);
    Console.WriteLine(num);

//Output: 2274

2.十六进制转浮点数

string hexString = "43480170";
    uint num = uint.Parse(hexString, System.Globalization.NumberStyles.AllowHexSpecifier);
    byte[] floatVals = BitConverter.GetBytes(num);
    float f = BitConverter.ToSingle(floatVals, 0);
    Console.WriteLine("float convert = {0}", f);

// Output: 200.0056

**四、字符串和十六进制字符串操作**

1.输出字符串中每个字符的十六进制值

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);
    }

/\* Output:   
Hexadecimal value of H is 48   
Hexadecimal value of e is 65   
Hexadecimal value of l is 6C   
Hexadecimal value of l is 6C   
Hexadecimal value of o is 6F   
Hexadecimal value of is 20   
Hexadecimal value of W is 57   
Hexadecimal value of o is 6F   
Hexadecimal value of r is 72   
Hexadecimal value of l is 6C   
Hexadecimal value of d is 64   
Hexadecimal value of ! is 21   
\*/

2.输出十六进制字符串值的字符

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);
    // 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);
    }

/\* Output:   
hexadecimal value = 48, int value = 72, char value = H or H   
hexadecimal value = 65, int value = 101, char value = e or e   
hexadecimal value = 6C, int value = 108, char value = l or l   
hexadecimal value = 6C, int value = 108, char value = l or l   
hexadecimal value = 6F, int value = 111, char value = o or o   
hexadecimal value = 20, int value = 32, char value = or   
hexadecimal value = 57, int value = 87, char value = W or W   
hexadecimal value = 6F, int value = 111, char value = o or o   
hexadecimal value = 72, int value = 114, char value = r or r   
hexadecimal value = 6C, int value = 108, char value = l or l   
hexadecimal value = 64, int value = 100, char value = d or d   
hexadecimal value = 21, int value = 33, char value = ! or !   
\*/

[C\#进制转换操作（二）][C]

[C\#进制转换操作（一）][C 1]  
[C\#转固定长度字符串][C 2]

[C]: http://blog.csdn.net/u011127019/article/details/53543403
[C 1]: http://blog.csdn.net/u011127019/article/details/53543202
[C 2]: http://blog.csdn.net/u011127019/article/details/53543760