如何在C＃中hex和十进制之间的数字转换？

如何在C＃中的hex数字和十进制数字之间进行转换？

Answer 1

从十进制转换为hex…

string hexValue = decValue.ToString("X"); 

从hex转换为十进制做…

 int decValue = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber); 

要么

 int decValue = Convert.ToInt32(hexValue, 16); 

Answer 2

hex – >十进制：

 Convert.ToInt64(hexValue, 16); 

十进制 – >hex

 string.format("{0:x}", decValue); 

Answer 3

看起来你可以说

 Convert.ToInt64(value, 16) 

从hex获得小数。

另一种方式是：

 otherVar.ToString("X"); 

Answer 4

如果在从hex转换为十进制数时需要最大性能，则可以使用预填充hex到十进制值的方法。

这是说明这个想法的代码。 我的性能testing显示，它可以比Convert.ToInt32（…）快20％-40％：

 class TableConvert { static sbyte[] unhex_table = { -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 , 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1 ,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1 ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 ,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1 ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 }; public static int Convert(string hexNumber) { int decValue = unhex_table[(byte)hexNumber[0]]; for (int i = 1; i < hexNumber.Length; i++) { decValue *= 16; decValue += unhex_table[(byte)hexNumber[i]]; } return decValue; } } 

Answer 5

  static string chex(byte e) // Convert a byte to a string representing that byte in hexadecimal { string r = ""; string chars = "0123456789ABCDEF"; r += chars[e >> 4]; return r += chars[e &= 0x0F]; } // Easy enough... static byte CRAZY_BYTE(string t, int i) // Take a byte, if zero return zero, else throw exception (i=0 means false, i>0 means true) { if (i == 0) return 0; throw new Exception(t); } static byte hbyte(string e) // Take 2 characters: these are hex chars, convert it to a byte { // WARNING: This code will make small children cry. Rated R. e = e.ToUpper(); // string msg = "INVALID CHARS"; // The message that will be thrown if the hex str is invalid byte[] t = new byte[] // Gets the 2 characters and puts them in seperate entries in a byte array. { // This will throw an exception if (e.Length != 2). (byte)e[CRAZY_BYTE("INVALID LENGTH", e.Length ^ 0x02)], (byte)e[0x01] }; for (byte i = 0x00; i < 0x02; i++) // Convert those [ascii] characters to [hexadecimal] characters. Error out if either character is invalid. { t[i] -= (byte)((t[i] >= 0x30) ? 0x30 : CRAZY_BYTE(msg, 0x01)); // Check for 0-9 t[i] -= (byte)((!(t[i] < 0x0A)) ? (t[i] >= 0x11 ? 0x07 : CRAZY_BYTE(msg, 0x01)) : 0x00); // Check for AF } return t[0x01] |= t[0x00] <<= 0x04; // The moment of truth. } 

Answer 6

这不是最简单的方法，但是这个源代码使你能够正确地使用任何types的八进制数，即23.214,23和0.512等等。 希望这会帮助你..

  public string octal_to_decimal(string m_value) { double i, j, x = 0; Int64 main_value; int k = 0; bool pw = true, ch; int position_pt = m_value.IndexOf("."); if (position_pt == -1) { main_value = Convert.ToInt64(m_value); ch = false; } else { main_value = Convert.ToInt64(m_value.Remove(position_pt, m_value.Length - position_pt)); ch = true; } while (k <= 1) { do { i = main_value % 10; // Return Remainder i = i * Convert.ToDouble(Math.Pow(8, x)); // calculate power if (pw) x++; else x--; o_to_d = o_to_d + i; // Saving Required calculated value in main variable main_value = main_value / 10; // Dividing the main value } while (main_value >= 1); if (ch) { k++; main_value = Convert.ToInt64(Reversestring(m_value.Remove(0, position_pt + 1))); } else k = 2; pw = false; x = -1; } return (Convert.ToString(o_to_d)); } 

Answer 7

从Geekpedia ：

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

Answer 8

 String stringrep = myintvar.ToString("X"); int num = int.Parse("FF", System.Globalization.NumberStyles.HexNumber); 

Answer 9

hex到十进制转换

 Convert.ToInt32(number, 16); 

十进制到hex转换

 int.Parse(number, System.Globalization.NumberStyles.HexNumber) 

欲了解更多信息请查看这篇文章

Answer 10

这是我的function：

 using System; using System.Collections.Generic; class HexadecimalToDecimal { static Dictionary<char, int> hexdecval = new Dictionary<char, int>{ {'0', 0}, {'1', 1}, {'2', 2}, {'3', 3}, {'4', 4}, {'5', 5}, {'6', 6}, {'7', 7}, {'8', 8}, {'9', 9}, {'a', 10}, {'b', 11}, {'c', 12}, {'d', 13}, {'e', 14}, {'f', 15}, }; static decimal HexToDec(string hex) { decimal result = 0; hex = hex.ToLower(); for (int i = 0; i < hex.Length; i++) { char valAt = hex[hex.Length - 1 - i]; result += hexdecval[valAt] * (int)Math.Pow(16, i); } return result; } static void Main() { Console.WriteLine("Enter Hexadecimal value"); string hex = Console.ReadLine().Trim(); //string hex = "29A"; Console.WriteLine("Hex {0} is dec {1}", hex, HexToDec(hex)); Console.ReadKey(); } } 

Answer 11

如果它是超出正常整数容量的hexstring：

对于.NET 3.5，我们可以使用BouncyCastle的BigInteger类：

 String hex = "68c7b05d0000000002f8"; // results in "494809724602834812404472" String decimal = new Org.BouncyCastle.Math.BigInteger(hex, 16).ToString(); 

.NET 4.0有BigInteger类。

Answer 12

我认为我的版本更容易理解，因为我的C＃知识不是很高。 我使用这个algorithm： http : //easyguyevo.hubpages.com/hub/Convert-Hex-to-Decimal （例2）

 using System; using System.Collections.Generic; static class Tool { public static string DecToHex(int x) { string result = ""; while (x != 0) { if ((x % 16) < 10) result = x % 16 + result; else { string temp = ""; switch (x % 16) { case 10: temp = "A"; break; case 11: temp = "B"; break; case 12: temp = "C"; break; case 13: temp = "D"; break; case 14: temp = "E"; break; case 15: temp = "F"; break; } result = temp + result; } x /= 16; } return result; } public static int HexToDec(string x) { int result = 0; int count = x.Length - 1; for (int i = 0; i < x.Length; i++) { int temp = 0; switch (x[i]) { case 'A': temp = 10; break; case 'B': temp = 11; break; case 'C': temp = 12; break; case 'D': temp = 13; break; case 'E': temp = 14; break; case 'F': temp = 15; break; default: temp = -48 + (int)x[i]; break; // -48 because of ASCII } result += temp * (int)(Math.Pow(16, count)); count--; } return result; } } class Program { static void Main(string[] args) { Console.Write("Enter Decimal value: "); int decNum = int.Parse(Console.ReadLine()); Console.WriteLine("Dec {0} is hex {1}", decNum, Tool.DecToHex(decNum)); Console.Write("\nEnter Hexadecimal value: "); string hexNum = Console.ReadLine().ToUpper(); Console.WriteLine("Hex {0} is dec {1}", hexNum, Tool.HexToDec(hexNum)); Console.ReadKey(); } } 

Answer 13

转换二进制到hex

 Convert.ToString(Convert.ToUInt32(binary1, 2), 16).ToUpper() 

Answer 14

将字节数组转换为hex表示的扩展方法。 这填充每个字节与前导零。

  /// <summary> /// Turns the byte array into its Hex representation. /// </summary> public static string ToHex(this byte[] y) { StringBuilder sb = new StringBuilder(); foreach (byte b in y) { sb.Append(b.ToString("X").PadLeft(2, "0"[0])); } return sb.ToString(); }