打印十六进制值的整数与零填充(如果需要):

int intValue = 1234;

Console.WriteLine("{0,0:D4} {0,0:X3}", intValue); 

https://learn.microsoft.com/en-us/dotnet/standard/base-types/how-to-pad-a-number-with-leading-zeros

在我找到这个答案之前，我创建了自己的解决方案，将int转换为十六进制字符串并返回。毫不奇怪，它比.net解决方案快得多，因为代码开销更少。

        /// <summary>
        /// Convert an integer to a string of hexidecimal numbers.
        /// </summary>
        /// <param name="n">The int to convert to Hex representation</param>
        /// <param name="len">number of digits in the hex string. Pads with leading zeros.</param>
        /// <returns></returns>
        private static String IntToHexString(int n, int len)
        {
            char[] ch = new char[len--];
            for (int i = len; i >= 0; i--)
            {
                ch[len - i] = ByteToHexChar((byte)((uint)(n >> 4 * i) & 15));
            }
            return new String(ch);
        }

        /// <summary>
        /// Convert a byte to a hexidecimal char
        /// </summary>
        /// <param name="b"></param>
        /// <returns></returns>
        private static char ByteToHexChar(byte b)
        {
            if (b < 0 || b > 15)
                throw new Exception("IntToHexChar: input out of range for Hex value");
            return b < 10 ? (char)(b + 48) : (char)(b + 55);
        }

        /// <summary>
        /// Convert a hexidecimal string to an base 10 integer
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        private static int HexStringToInt(String str)
        {
            int value = 0;
            for (int i = 0; i < str.Length; i++)
            {
                value += HexCharToInt(str[i]) << ((str.Length - 1 - i) * 4);
            }
            return value;
        }

        /// <summary>
        /// Convert a hex char to it an integer.
        /// </summary>
        /// <param name="ch"></param>
        /// <returns></returns>
        private static int HexCharToInt(char ch)
        {
            if (ch < 48 || (ch > 57 && ch < 65) || ch > 70)
                throw new Exception("HexCharToInt: input out of range for Hex value");
            return (ch < 58) ? ch - 48 : ch - 55;
        }

计时代码:

static void Main(string[] args)
        {
            int num = 3500;
            long start = System.Diagnostics.Stopwatch.GetTimestamp();
            for (int i = 0; i < 2000000; i++)
                if (num != HexStringToInt(IntToHexString(num, 3)))
                    Console.WriteLine(num + " = " + HexStringToInt(IntToHexString(num, 3)));
            long end = System.Diagnostics.Stopwatch.GetTimestamp();
            Console.WriteLine(((double)end - (double)start)/(double)System.Diagnostics.Stopwatch.Frequency);

            for (int i = 0; i < 2000000; i++)
                if (num != Convert.ToInt32(num.ToString("X3"), 16))
                    Console.WriteLine(i);
            end = System.Diagnostics.Stopwatch.GetTimestamp();
            Console.WriteLine(((double)end - (double)start)/(double)System.Diagnostics.Stopwatch.Frequency);
            Console.ReadLine(); 
        }

结果:

Digits : MyCode : .Net
1 : 0.21 : 0.45
2 : 0.31 : 0.56
4 : 0.51 : 0.78
6 : 0.70 : 1.02
8 : 0.90 : 1.25

尝试以下将其转换为十六进制

public static string ToHex(this int value) {
  return String.Format("0x{0:X}", value);
}

然后再回来

public static int FromHex(string value) {
  // strip the leading 0x
  if ( value.StartsWith("0x", StringComparison.OrdinalIgnoreCase)) {
    value = value.Substring(2);
  }
  return Int32.Parse(value, NumberStyles.HexNumber);
}

int valInt = 12;
Console.WriteLine(valInt.ToString("X"));  // C  ~ possibly single-digit output 
Console.WriteLine(valInt.ToString("X2")); // 0C ~ always double-digit output

string HexFromID(int ID)
{
    return ID.ToString("X");
}

int IDFromHex(string HexID)
{
    return int.Parse(HexID, System.Globalization.NumberStyles.HexNumber);
}

但我真的怀疑这东西的价值。你的目标是使值更短，这是可以做到的，但这本身并不是一个目标。你的意思是要么让它更容易记，要么让它更容易打。

如果你的意思是更容易记住，那么你就后退了一步。我们知道它的大小是一样的，只是编码不同了。但是你的用户不会知道这些字母被限制为“A-F”，所以ID对他们来说将占据相同的概念空间，就像字母“A-Z”被允许一样。因此，它不像记忆电话号码，而更像记忆GUID(相同长度)。

如果你指的是打字，用户现在必须使用键盘的主要部分，而不是能够使用小键盘。打字可能会更困难，因为他们的手指不认识这个词。

一个更好的选择是让他们选择一个真实的用户名。

微软网络框架

非常好的解释和少数编程行 好工作

// Store integer 182
int intValue = 182;
// Convert integer 182 as a hex in a string variable
string hexValue = intValue.ToString("X");
// Convert the hex string back to the number
int intAgain = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);

PASCAL >> c#

http://files.hddguru.com/download/Software/Seagate/St_mem.pas

从老式的pascal转换成c#的程序

    /// <summary>
    /// Conver number from Decadic to Hexadecimal
    /// </summary>
    /// <param name="w"></param>
    /// <returns></returns>
    public string MakeHex(int w)
    {
        try
        {
           char[] b =  {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
           char[] S = new char[7];

              S[0] = b[(w >> 24) & 15];
              S[1] = b[(w >> 20) & 15];
              S[2] = b[(w >> 16) & 15];
              S[3] = b[(w >> 12) & 15];
              S[4] = b[(w >> 8) & 15];
              S[5] = b[(w >> 4) & 15];
              S[6] = b[w & 15];

              string _MakeHex = new string(S, 0, S.Count());

              return _MakeHex;
        }
        catch (Exception ex)
        {

            throw;
        }
    }