C# 进制之间的转换

  1 /// <summary>  2         /// 十进制转换为二进制  3         /// </summary>  4         /// <param name="x"></param>  5         /// <returns></returns>  6         public static string DecToBin(string x)  7         {  8             string z = null;  9             int X = Convert.ToInt32(x); 10             int i = 0; 11             long a, b = 0; 12             while (X > 0) 13             { 14                 a = X%2; 15                 X = X/2; 16                 b = b + a*Pow(10, i); 17                 i++; 18             } 19             z = Convert.ToString(b); 20             return z; 21         } 22  23         /// <summary> 24         /// 16进制转ASCII码 25         /// </summary> 26         /// <param name="hexString"></param> 27         /// <returns></returns> 28         public static string HexToAscii(string hexString) 29         { 30             StringBuilder sb = new StringBuilder(); 31             for (int i = 0; i <= hexString.Length - 2; i += 2) 32             { 33                 sb.Append( 34                     Convert.ToString( 35                         Convert.ToChar(Int32.Parse(hexString.Substring(i, 2), 36                                                    System.Globalization.NumberStyles.HexNumber)))); 37             } 38             return sb.ToString(); 39         } 40  41         /// <summary> 42         /// 十进制转换为八进制 43         /// </summary> 44         /// <param name="x"></param> 45         /// <returns></returns> 46         public static string DecToOtc(string x) 47         { 48             string z = null; 49             int X = Convert.ToInt32(x); 50             int i = 0; 51             long a, b = 0; 52             while (X > 0) 53             { 54                 a = X%8; 55                 X = X/8; 56                 b = b + a*Pow(10, i); 57                 i++; 58             } 59             z = Convert.ToString(b); 60             return z; 61         } 62  63         /// <summary> 64         /// 十进制转换为十六进制 65         /// </summary> 66         /// <param name="x"></param> 67         /// <returns></returns> 68         public static string DecToHex(string x) 69         { 70             if (string.IsNullOrEmpty(x)) 71             { 72                 return "0"; 73             } 74             string z = null; 75             int X = Convert.ToInt32(x); 76             Stack a = new Stack(); 77             int i = 0; 78             while (X > 0) 79             { 80                 a.Push(Convert.ToString(X%16)); 81                 X = X/16; 82                 i++; 83             } 84             while (a.Count != 0) 85                 z += ToHex(Convert.ToString(a.Pop())); 86             if (string.IsNullOrEmpty(z)) 87             { 88                 z = "0"; 89             } 90             return z; 91         } 92  93         /// <summary> 94         /// 二进制转换为十进制 95         /// </summary> 96         /// <param name="x"></param> 97         /// <returns></returns> 98         public static string BinToDec(string x) 99         {100             string z = null;101             int X = Convert.ToInt32(x);102             int i = 0;103             long a, b = 0;104             while (X > 0)105             {106                 a = X%10;107                 X = X/10;108                 b = b + a*Pow(2, i);109                 i++;110             }111             z = Convert.ToString(b);112             return z;113         }114 115         /// <summary>116         /// 二进制转换为十进制，定长转换117         /// </summary>118         /// <param name="x"></param>119         /// <param name="iLength"></param>120         /// <returns></returns>121         public static string BinToDec(string x, short iLength)122         {123             StringBuilder sb = new StringBuilder();124             int iCount = 0;125 126             iCount = x.Length/iLength;127 128             if (x.Length%iLength > 0)129             {130                 iCount += 1;131             }132 133             int X = 0;134 135             for (int i = 0; i < iCount; i++)136             {137                 if ((i + 1)*iLength > x.Length)138                 {139                     X = Convert.ToInt32(x.Substring(i*iLength, (x.Length - iLength)));140                 }141                 else142                 {143                     X = Convert.ToInt32(x.Substring(i*iLength, iLength));144                 }145                 int j = 0;146                 long a, b = 0;147                 while (X > 0)148                 {149                     a = X%10;150                     X = X/10;151                     b = b + a*Pow(2, j);152                     j++;153                 }154                 sb.AppendFormat("{0:D2}", b);155             }156             return sb.ToString();157         }158 159         /// <summary>160         /// 二进制转换为十六进制，定长转换161         /// </summary>162         /// <param name="x"></param>163         /// <param name="iLength"></param>164         /// <returns></returns>165         public static string BinToHex(string x, short iLength)166         {167             StringBuilder sb = new StringBuilder();168             int iCount = 0;169 170             iCount = x.Length/iLength;171 172             if (x.Length%iLength > 0)173             {174                 iCount += 1;175             }176 177             int X = 0;178 179             for (int i = 0; i < iCount; i++)180             {181                 if ((i + 1)*iLength > x.Length)182                 {183                     X = Convert.ToInt32(x.Substring(i*iLength, (x.Length - iLength)));184                 }185                 else186                 {187                     X = Convert.ToInt32(x.Substring(i*iLength, iLength));188                 }189                 int j = 0;190                 long a, b = 0;191                 while (X > 0)192                 {193                     a = X%10;194                     X = X/10;195                     b = b + a*Pow(2, j);196                     j++;197                 }198                 //前补0199                 sb.Append(DecToHex(b.ToString()));200             }201             return sb.ToString();202         }203 204         /// <summary>205         /// 八进制转换为十进制206         /// </summary>207         /// <param name="x"></param>208         /// <returns></returns>209         public static string OctToDec(string x)210         {211             string z = null;212             int X = Convert.ToInt32(x);213             int i = 0;214             long a, b = 0;215             while (X > 0)216             {217                 a = X%10;218                 X = X/10;219                 b = b + a*Pow(8, i);220                 i++;221             }222             z = Convert.ToString(b);223             return z;224         }225 226 227         /// <summary>228         /// 十六进制转换为十进制229         /// </summary>230         /// <param name="x"></param>231         /// <returns></returns>232         public static string HexToDec(string x)233         {234             if (string.IsNullOrEmpty(x))235             {236                 return "0";237             }238             string z = null;239             Stack a = new Stack();240             int i = 0, j = 0, l = x.Length;241             long Tong = 0;242             while (i < l)243             {244                 a.Push(ToDec(Convert.ToString(x[i])));245                 i++;246             }247             while (a.Count != 0)248             {249                 Tong = Tong + Convert.ToInt64(a.Pop())*Pow(16, j);250                 j++;251             }252             z = Convert.ToString(Tong);253             return z;254         }255 256         #endregion //Helperfunctions257 258         /// <summary>259         /// 260         /// </summary>261         /// <param name="x"></param>262         /// <param name="y"></param>263         /// <returns></returns>264         private static long Pow(long x, long y)265         {266             int i = 1;267             long X = x;268             if (y == 0)269                 return 1;270             while (i < y)271             {272                 x = x*X;273                 i++;274             }275             return x;276         }277 278         /// <summary>279         /// 280         /// </summary>281         /// <param name="x"></param>282         /// <returns></returns>283         private static string ToDec(string x)284         {285             switch (x)286             {287                 case "A":288                     return "10";289                 case "B":290                     return "11";291                 case "C":292                     return "12";293                 case "D":294                     return "13";295                 case "E":296                     return "14";297                 case "F":298                     return "15";299                 default:300                     return x;301             }302         }303 304         /// <summary>305         /// 306         /// </summary>307         /// <param name="x"></param>308         /// <returns></returns>309         private static string ToHex(string x)310         {311             switch (x)312             {313                 case "10":314                     return "A";315                 case "11":316                     return "B";317                 case "12":318                     return "C";319                 case "13":320                     return "D";321                 case "14":322                     return "E";323                 case "15":324                     return "F";325                 default:326                     return x;327             }328         }329 330         /// <summary>331         /// 将16进制BYTE数组转换成16进制字符串332         /// </summary>333         /// <param name="bytes"></param>334         /// <returns></returns>335         public static string ToHexString(byte[] bytes) // 0xae00cf => "AE00CF "336         {337             string hexString = string.Empty;338             if (bytes != null)339             {340                 StringBuilder strB = new StringBuilder();341 342                 for (int i = 0; i < bytes.Length; i++)343                 {344                     strB.Append(bytes[i].ToString("X2"));345                 }346                 hexString = strB.ToString();347             }348             return hexString;349         }

  1 /// <summary>  2         ///   3         /// </summary>  4         /// <param name="bytes"></param>  5         /// <param name="iLength"></param>  6         /// <returns></returns>  7         public static string ToHexString(byte[] bytes, int iLength) // 0xae00cf => "AE00CF "  8         {  9             string hexString = string.Empty; 10             if (bytes != null) 11             { 12                 StringBuilder strB = new StringBuilder(); 13  14                 if (bytes.Length < iLength) 15                 { 16                     iLength = bytes.Length; 17                 } 18  19                 for (int i = 0; i < iLength; i++) 20                 { 21                     strB.Append(bytes[i].ToString("X2")); 22                 } 23                 hexString = strB.ToString(); 24             } 25             return hexString; 26         } 27  28         /// <summary> 29         /// 将byte数组转换为16进制字符串 30         /// </summary> 31         /// <param name="bytes">要转换的数组</param> 32         /// <param name="iStart">数组下标</param> 33         /// <param name="iLength">长度</param> 34         /// <returns></returns> 35         public static string ToHexString(byte[] bytes, int iStart, int iLength) // 0xae00cf => "AE00CF " 36         { 37             string hexString = string.Empty; 38             if (bytes != null) 39             { 40                 StringBuilder strB = new StringBuilder(); 41  42                 //缓冲区长度问题，需清空缓冲区 43                 if (bytes.Length < (iLength + iStart)) 44                 { 45                     iLength = bytes.Length; 46                 } 47  48                 for (int i = iStart; i < iLength + iStart; i++) 49                 { 50                     strB.Append(bytes[i].ToString("X2")); 51                 } 52                 hexString = strB.ToString(); 53             } 54             return hexString; 55         } 56  57         /// <summary> 58         ///  59         /// </summary> 60         /// <param name="hexString"></param> 61         /// <param name="discarded"></param> 62         /// <returns></returns> 63         public static byte[] GetBytes(string hexString, out int discarded) 64         { 65             discarded = 0; 66             string newString = ""; 67             char c; 68             // remove all none A-F, 0-9, characters 69             for (int i = 0; i < hexString.Length; i++) 70             { 71                 c = hexString[i]; 72                 if (Uri.IsHexDigit(c)) 73                     newString += c; 74                 else 75                     discarded++; 76             } 77             // if odd number of characters, discard last character 78             if (newString.Length%2 != 0) 79             { 80                 discarded++; 81                 newString = newString.Substring(0, newString.Length - 1); 82             } 83  84             return HexToByte(newString); 85         } 86  87         /// <summary> 88         /// Converts from binary coded decimal to integer 89         /// </summary> 90         /// <param name="num"></param> 91         /// <returns></returns> 92         public static uint BcdToDec(uint num) 93         { 94             return HornerScheme(num, 0x10, 10); 95         } 96  97         /// <summary> 98         /// Converts from integer to binary coded decimal 99         /// </summary>100         /// <param name="num"></param>101         /// <returns></returns>102         public static uint DecToBcd(uint num)103         {104             return HornerScheme(num, 10, 0x10);105         }106 107         private static uint HornerScheme(uint num, uint divider, uint factor)108         {109             uint remainder = 0, quotient = 0, result = 0;110             remainder = num%divider;111             quotient = num/divider;112             if (!(quotient == 0 && remainder == 0))113                 result += HornerScheme(quotient, divider, factor)*factor + remainder;114             return result;115         }116 117         /// <summary>118         /// byte数组尾部0截取函数119         /// </summary>120         /// <param name="buf">原始byte数组</param>121         /// <param name="iLength">要截取的长度</param>122         /// <returns>截取后的数组</returns>123         public static byte[] InterceptByte(byte[] buf, int iLength)124         {125             StringBuilder sb = new StringBuilder(iLength*2);126             sb = sb.Append(ToHexString(buf, (short) iLength));127             int discarded = 0;128             byte[] bReturn = GetBytes(sb.ToString(), out discarded);129 130             if (discarded > 0)131             {132                 throw new Exception("byte数组截取有数据丢失！");133             }134             return bReturn;135         }136 137         /// <summary>138         /// 139         /// </summary>140         /// <param name="hexString"></param>141         /// <returns></returns>142         public static byte[] HexToByte(string hexString)143         {144             if (string.IsNullOrEmpty(hexString))145             {146                 hexString = "00";147             }148             byte[] returnBytes = new byte[hexString.Length/2];149             for (int i = 0; i < returnBytes.Length; i++)150                 returnBytes[i] = Convert.ToByte(hexString.Substring(i*2, 2), 16);151             return returnBytes;152         }153 154         /// <summary>155         /// 日期转BCD数组156         /// </summary>157         /// <param name="dateTime"></param>158         /// <param name="type">4 6 7</param>159         /// <returns></returns>160         public static byte[] DateTimeToBCD(DateTime dateTime, ushort type)161         {162             string strServerTime = string.Format("{0:yyyyMMddHHmmss}", dateTime);163 164             byte[] bcd = new byte[type];165             if (type == 4)166             {167                 bcd[0] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(0, 2))).ToString("D2"));168                 bcd[1] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(2, 2))).ToString("D2"));169                 bcd[2] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(4, 2))).ToString("D2"));170                 bcd[3] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(6, 2))).ToString("D2"));171             }172             if (type == 6)173             {174                 bcd[0] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(2, 2))).ToString("D2"));175                 bcd[1] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(4, 2))).ToString("D2"));176                 bcd[2] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(6, 2))).ToString("D2"));177                 bcd[3] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(8, 2))).ToString("D2"));178                 bcd[4] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(10, 2))).ToString("D2"));179                 bcd[5] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(12, 2))).ToString("D2"));180             }181             if (type == 7)182             {183                 bcd[0] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(0, 2))).ToString("D2"));184                 bcd[1] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(2, 2))).ToString("D2"));185                 bcd[2] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(4, 2))).ToString("D2"));186                 bcd[3] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(6, 2))).ToString("D2"));187                 bcd[4] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(8, 2))).ToString("D2"));188                 bcd[5] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(10, 2))).ToString("D2"));189                 bcd[5] = byte.Parse(DecToBcd(uint.Parse(strServerTime.Substring(12, 2))).ToString("D2"));190             }191             return bcd;192         }193 194         /// <summary>195         /// BCD时间转日期时间196         /// </summary>197         /// <param name="bcdTime"></param>198         /// <param name="type"></param>199         /// <returns></returns>200         public static DateTime BCDToDateTime(byte[] bcdTime, ushort type)201         {202             StringBuilder sb = new StringBuilder();203             if (type == 4) //4位BCD码的日期204             {205                 sb.Append(BcdToDec(bcdTime[0]).ToString("D2"));206                 sb.Append(BcdToDec(bcdTime[1]).ToString("D2"));207                 sb.Append('-' + BcdToDec(bcdTime[2]).ToString("D2"));208                 sb.Append('-' + BcdToDec(bcdTime[3]).ToString("D2") + " ");209             }210             if (type == 6) //6位BCD码的时间211             {212                 sb.Append(DateTime.Now.ToString("yyyy").Substring(0, 2));213                 sb.Append(BcdToDec(bcdTime[0]).ToString("D2"));214                 sb.Append('-' + BcdToDec(bcdTime[1]).ToString("D2"));215                 sb.Append('-' + BcdToDec(bcdTime[2]).ToString("D2") + " ");216                 sb.Append(BcdToDec(bcdTime[3]).ToString("D2") + ":");217                 sb.Append(BcdToDec(bcdTime[4]).ToString("D2") + ":");218                 sb.Append(BcdToDec(bcdTime[5]));219             }220             if (type == 7) //7位BCD码的日期221             {222                 sb.Append(BcdToDec(bcdTime[0]).ToString("D2"));223                 sb.Append(BcdToDec(bcdTime[1]).ToString("D2"));224                 sb.Append('-' + BcdToDec(bcdTime[2]).ToString("D2"));225                 sb.Append('-' + BcdToDec(bcdTime[3]).ToString("D2") + " ");226                 sb.Append(BcdToDec(bcdTime[4]).ToString("D2") + ":");227                 sb.Append(BcdToDec(bcdTime[5]).ToString("D2") + ":");228                 sb.Append(BcdToDec(bcdTime[6]));229             }230 231             DateTime dt;232             //2011-3-26 当日期出错时的处理233             DateTime.TryParse(sb.ToString(), out dt);234 235             return dt;236         }237     }238 }

 

转http://www.cnblogs.com/jhabb/archive/2011/05/06/2038777.html[落冰]