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 else 142 { 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 else 186 { 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0 199 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 //Helperfunctions 257 258 /// <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]
