一、字串和16進位制字串互轉

1.字串轉16進位制字串

/// <summary>  
/// 字串轉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); //預設是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>
/// 字串轉Hex，方法2使用BitConverter
/// </summary>
/// <param name="mStr"></param>
/// <returns></returns>
public static string StrToHex(string mStr) //返回處理後的十六進位制字串
{
    return BitConverter.ToString(
    Encoding.Default.GetBytes(mStr)).Replace("-", " ");

    //return BitConverter.ToString(
    //ASCIIEncoding.Default.GetBytes(mStr)).Replace("-", " ");
}
 

2.16進位制字串轉字串

/// <summary>
/// 返回十六進位制代表的字串
/// </summary>
/// <param name="mHex"></param>
/// <returns></returns>
public static string HexToString(string mHex) // 返回十六進位制代表的字串
{
    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);
}
 

/*
    *  特別說明：字串和十六進位制之間的轉換需要使用相同的字符集才能識別
    */ 
Console.WriteLine(StringToHex("張三ABC"));//D5C5C8FD414243
Console.WriteLine(StrToHex("張三ABC")); //D5 C5 C8 FD 41 42 43
Console.WriteLine(HexToString("D5C5C8FD414243")); //張三ABC

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

三、十六進位制 string 轉換為浮點型，轉換為整數

1.十六進位制字串轉整數

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

2.十六進位制轉浮點數

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); 

四、字串和十六進位制字串操作

1.輸出字串中每個字元的十六進位制值

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);
} 

2.輸出十六進位制字串值的字元

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);
} 

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