摘要：
areaCode+val.ToString（）。子字符串：areaCode+val。ToString（））；returndecimal。解析；｝我不知道问题出在哪里，大侠知道这是为了提醒我！我在互联网上有一个CRC算法。我和他之间的区别是，我只有一把钥匙，它有很多钥匙。这就是原因吗？
这几天在使用CRC算法生成逐渐编码的时候，发现一个问题，出现了重复的编码值，按道理根据GUID来生成CRC的编码是不会出现重复值的，可就是出现了，我的CRC算法编码如下：
///<summary>///人口库主键生成工具类
///</summary>publicclassKeysHelper
{
staticprotectedUInt64[]crc32Table;
staticprotectedKeysHelper_crc32=newKeysHelper();
privateconstUInt64INITIALCRC=0xFFFFFFFFFFFFFFFFUL;
KeysHelper()
{
constUInt64ulPolynomial=0x95AC9329AC4BC9B5UL;
UInt64dwCrc;
crc32Table=newUInt64[256];
inti,j;
for(i=0;i<256;i++)
{
dwCrc=(UInt64)i;
for(j=8;j>0;j--)
{
if((dwCrc&1)==1)
dwCrc=(dwCrc>>1)^ulPolynomial;
else
dwCrc>>=1;
}
crc32Table[i]=dwCrc;
}
}
///<summary>///字节数组效验
///</summary>///<paramname="buffer">ref字节数组</param>///<returns></returns>privatestaticUInt64ByteCRC(refbyte[]buffer)
{
UInt64ulCRC=INITIALCRC;
uintlen;
len=(uint)buffer.Length;
for(uintbuffptr=0;buffptr<len;buffptr++)
{
uinttabPtr=(uint)ulCRC&0xFF;
tabPtr=tabPtr^buffer[buffptr];
ulCRC=ulCRC>>8;
ulCRC=ulCRC^crc32Table[tabPtr];
}
returnulCRC^INITIALCRC;
}
///<summary>///获取主键编码
///</summary>///<paramname="sInputString">字符串</param>///<returns></returns>publicstaticdecimalGetKey(stringsInputString)
{
if(sInputString!=null)
sInputString=sInputString.ToUpper().Trim();
byte[]buffer=Encoding.Default.GetBytes(sInputString);
return(decimal)ByteCRC(refbuffer);
}
///<summary>///获取主键编码(根据地市来生成)
///</summary>///<paramname="sInputString">字符串</param>///<paramname="areaCode">四位数的编码(4401)</param>///<returns></returns>publicstaticdecimalGetKey(stringsInputString,stringareaCode)
{
if(sInputString!=null)
sInputString=sInputString.ToUpper().Trim();
byte[]buffer=Encoding.Default.GetBytes(sInputString);
decimalval=(decimal)ByteCRC(refbuffer);
varstr=(val.ToString().Length>14?areaCode+val.ToString().Substring(0,14):areaCode+val.ToString());
returndecimal.Parse(str);
}
///</summary>publicclassKeysHelper
{
staticprotectedUInt64[]crc32Table;
staticprotectedKeysHelper_crc32=newKeysHelper();
privateconstUInt64INITIALCRC=0xFFFFFFFFFFFFFFFFUL;
KeysHelper()
{
constUInt64ulPolynomial=0x95AC9329AC4BC9B5UL;
UInt64dwCrc;
crc32Table=newUInt64[256];
inti,j;
for(i=0;i<256;i++)
{
dwCrc=(UInt64)i;
for(j=8;j>0;j--)
{
if((dwCrc&1)==1)
dwCrc=(dwCrc>>1)^ulPolynomial;
else
dwCrc>>=1;
}
crc32Table[i]=dwCrc;
}
}
///<summary>///字节数组效验
///</summary>///<paramname="buffer">ref字节数组</param>///<returns></returns>privatestaticUInt64ByteCRC(refbyte[]buffer)
{
UInt64ulCRC=INITIALCRC;
uintlen;
len=(uint)buffer.Length;
for(uintbuffptr=0;buffptr<len;buffptr++)
{
uinttabPtr=(uint)ulCRC&0xFF;
tabPtr=tabPtr^buffer[buffptr];
ulCRC=ulCRC>>8;
ulCRC=ulCRC^crc32Table[tabPtr];
}
returnulCRC^INITIALCRC;
}
///<summary>///获取主键编码
///</summary>///<paramname="sInputString">字符串</param>///<returns></returns>publicstaticdecimalGetKey(stringsInputString)
{
if(sInputString!=null)
sInputString=sInputString.ToUpper().Trim();
byte[]buffer=Encoding.Default.GetBytes(sInputString);
return(decimal)ByteCRC(refbuffer);
}
///<summary>///获取主键编码(根据地市来生成)
///</summary>///<paramname="sInputString">字符串</param>///<paramname="areaCode">四位数的编码(4401)</param>///<returns></returns>publicstaticdecimalGetKey(stringsInputString,stringareaCode)
{
if(sInputString!=null)
sInputString=sInputString.ToUpper().Trim();
byte[]buffer=Encoding.Default.GetBytes(sInputString);
decimalval=(decimal)ByteCRC(refbuffer);
varstr=(val.ToString().Length>14?areaCode+val.ToString().Substring(0,14):areaCode+val.ToString());
returndecimal.Parse(str);
}
不知道问题出在哪里了，哪位大侠知道的提示一下！
我在网上在了一个CRC的算法，我和他的区别就是我只有一个KEY，它有很多个KEY，难道是这个的原因吗？
usingSystem;
namespaceCRC
...{
publicsealedclassCrc32:ICRC
...{
readonlystaticuintCrcSeed=0xFFFFFFFF;
readonlystaticuint[]CrcTable=newuint[]...{
0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,
0x706AF48F,0xE963A535,0x9E6495A3,0x0EDB8832,0x79DCB8A4,
0xE0D5E91E,0x97D2D988,0x09B64C2B,0x7EB17CBD,0xE7B82D07,
0x90BF1D91,0x1DB71064,0x6AB020F2,0xF3B97148,0x84BE41DE,
0x1ADAD47D,0x6DDDE4EB,0xF4D4B551,0x83D385C7,0x136C9856,
0x646BA8C0,0xFD62F97A,0x8A65C9EC,0x14015C4F,0x63066CD9,
0xFA0F3D63,0x8D080DF5,0x3B6E20C8,0x4C69105E,0xD56041E4,
0xA2677172,0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,
0x35B5A8FA,0x42B2986C,0xDBBBC9D6,0xACBCF940,0x32D86CE3,
0x45DF5C75,0xDCD60DCF,0xABD13D59,0x26D930AC,0x51DE003A,
0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,0xCFBA9599,
0xB8BDA50F,0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,
0x2F6F7C87,0x58684C11,0xC1611DAB,0xB6662D3D,0x76DC4190,
0x01DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F,
0x9FBFE4A5,0xE8B8D433,0x7807C9A2,0x0F00F934,0x9609A88E,
0xE10E9818,0x7F6A0DBB,0x086D3D2D,0x91646C97,0xE6635C01,
0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E,0x6C0695ED,
0x1B01A57B,0x8208F4C1,0xF50FC457,0x65B0D9C6,0x12B7E950,
0x8BBEB8EA,0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,
0xFBD44C65,0x4DB26158,0x3AB551CE,0xA3BC0074,0xD4BB30E2,
0x4ADFA541,0x3DD895D7,0xA4D1C46D,0xD3D6F4FB,0x4369E96A,
0x346ED9FC,0xAD678846,0xDA60B8D0,0x44042D73,0x33031DE5,
0xAA0A4C5F,0xDD0D7CC9,0x5005713C,0x270241AA,0xBE0B1010,
0xC90C2086,0x5768B525,0x206F85B3,0xB966D409,0xCE61E49F,
0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,
0x2EB40D81,0xB7BD5C3B,0xC0BA6CAD,0xEDB88320,0x9ABFB3B6,
0x03B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x04DB2615,
0x73DC1683,0xE3630B12,0x94643B84,0x0D6D6A3E,0x7A6A5AA8,
0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,0xF00F9344,
0x8708A3D2,0x1E01F268,0x6906C2FE,0xF762575D,0x806567CB,
0x196C3671,0x6E6B06E7,0xFED41B76,0x89D32BE0,0x10DA7A5A,
0x67DD4ACC,0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,
0xD6D6A3E8,0xA1D1937E,0x38D8C2C4,0x4FDFF252,0xD1BB67F1,
0xA6BC5767,0x3FB506DD,0x48B2364B,0xD80D2BDA,0xAF0A1B4C,
0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,0x316E8EEF,
0x4669BE79,0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,
0xCC0C7795,0xBB0B4703,0x220216B9,0x5505262F,0xC5BA3BBE,
0xB2BD0B28,0x2BB45A92,0x5CB36A04,0xC2D7FFA7,0xB5D0CF31,
0x2CD99E8B,0x5BDEAE1D,0x9B64C2B0,0xEC63F226,0x756AA39C,
0x026D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x05005713,
0x95BF4A82,0xE2B87A14,0x7BB12BAE,0x0CB61B38,0x92D28E9B,
0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,0x86D3D2D4,0xF1D4E242,
0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,
0x18B74777,0x88085AE6,0xFF0F6A70,0x66063BCA,0x11010B5C,
0x8F659EFF,0xF862AE69,0x616BFFD3,0x166CCF45,0xA00AE278,
0xD70DD2EE,0x4E048354,0x3903B3C2,0xA7672661,0xD06016F7,
0x4969474D,0x3E6E77DB,0xAED16A4A,0xD9D65ADC,0x40DF0B66,
0x37D83BF0,0xA9BCAE53,0xDEBB9EC5,0x47B2CF7F,0x30B5FFE9,
0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605,
0xCDD70693,0x54DE5729,0x23D967BF,0xB3667A2E,0xC4614AB8,
0x5D681B02,0x2A6F2B94,0xB40BBE37,0xC30C8EA1,0x5A05DF1B,
0x2D02EF8D
};
internalstaticuintComputeCrc32(uintoldCrc,bytebval)
...{
return(uint)(Crc32.CrcTable[(oldCrc^bval)&0xFF]^(oldCrc>>8));
}
uintcrc=0;
publiclongValue
...{
get
...{
return(long)crc;
}
set
...{
crc=(uint)value;
}
}
publicvoidReset()
...{
crc=0;
}
publicvoidCrc(intbval)
...{
crc^=CrcSeed;
crc=CrcTable[(crc^bval)&0xFF]^(crc>>8);
crc^=CrcSeed;
}
publicvoidCrc(byte[]buffer)
...{
Crc(buffer,0,buffer.Length);
}
publicvoidCrc(byte[]buf,intoff,intlen)
...{
if(buf==null)
...{
thrownewArgumentNullException("buf");
}
if(off<0||len<0||off+len>buf.Length)
...{
thrownewArgumentOutOfRangeException();
}
crc^=CrcSeed;
while(--len>=0)
...{
crc=CrcTable[(crc^buf[off++])&0xFF]^(crc>>8);
}
crc^=CrcSeed;
}
}
}
namespaceCRC
...{
publicsealedclassCrc32:ICRC
...{
readonlystaticuintCrcSeed=0xFFFFFFFF;
readonlystaticuint[]CrcTable=newuint[]...{
0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,
0x706AF48F,0xE963A535,0x9E6495A3,0x0EDB8832,0x79DCB8A4,
0xE0D5E91E,0x97D2D988,0x09B64C2B,0x7EB17CBD,0xE7B82D07,
0x90BF1D91,0x1DB71064,0x6AB020F2,0xF3B97148,0x84BE41DE,
0x1ADAD47D,0x6DDDE4EB,0xF4D4B551,0x83D385C7,0x136C9856,
0x646BA8C0,0xFD62F97A,0x8A65C9EC,0x14015C4F,0x63066CD9,
0xFA0F3D63,0x8D080DF5,0x3B6E20C8,0x4C69105E,0xD56041E4,
0xA2677172,0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,
0x35B5A8FA,0x42B2986C,0xDBBBC9D6,0xACBCF940,0x32D86CE3,
0x45DF5C75,0xDCD60DCF,0xABD13D59,0x26D930AC,0x51DE003A,
0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,0xCFBA9599,
0xB8BDA50F,0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,
0x2F6F7C87,0x58684C11,0xC1611DAB,0xB6662D3D,0x76DC4190,
0x01DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F,
0x9FBFE4A5,0xE8B8D433,0x7807C9A2,0x0F00F934,0x9609A88E,
0xE10E9818,0x7F6A0DBB,0x086D3D2D,0x91646C97,0xE6635C01,
0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E,0x6C0695ED,
0x1B01A57B,0x8208F4C1,0xF50FC457,0x65B0D9C6,0x12B7E950,
0x8BBEB8EA,0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,
0xFBD44C65,0x4DB26158,0x3AB551CE,0xA3BC0074,0xD4BB30E2,
0x4ADFA541,0x3DD895D7,0xA4D1C46D,0xD3D6F4FB,0x4369E96A,
0x346ED9FC,0xAD678846,0xDA60B8D0,0x44042D73,0x33031DE5,
0xAA0A4C5F,0xDD0D7CC9,0x5005713C,0x270241AA,0xBE0B1010,
0xC90C2086,0x5768B525,0x206F85B3,0xB966D409,0xCE61E49F,
0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,
0x2EB40D81,0xB7BD5C3B,0xC0BA6CAD,0xEDB88320,0x9ABFB3B6,
0x03B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x04DB2615,
0x73DC1683,0xE3630B12,0x94643B84,0x0D6D6A3E,0x7A6A5AA8,
0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,0xF00F9344,
0x8708A3D2,0x1E01F268,0x6906C2FE,0xF762575D,0x806567CB,
0x196C3671,0x6E6B06E7,0xFED41B76,0x89D32BE0,0x10DA7A5A,
0x67DD4ACC,0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,
0xD6D6A3E8,0xA1D1937E,0x38D8C2C4,0x4FDFF252,0xD1BB67F1,
0xA6BC5767,0x3FB506DD,0x48B2364B,0xD80D2BDA,0xAF0A1B4C,
0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,0x316E8EEF,
0x4669BE79,0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,
0xCC0C7795,0xBB0B4703,0x220216B9,0x5505262F,0xC5BA3BBE,
0xB2BD0B28,0x2BB45A92,0x5CB36A04,0xC2D7FFA7,0xB5D0CF31,
0x2CD99E8B,0x5BDEAE1D,0x9B64C2B0,0xEC63F226,0x756AA39C,
0x026D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x05005713,
0x95BF4A82,0xE2B87A14,0x7BB12BAE,0x0CB61B38,0x92D28E9B,
0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,0x86D3D2D4,0xF1D4E242,
0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,
0x18B74777,0x88085AE6,0xFF0F6A70,0x66063BCA,0x11010B5C,
0x8F659EFF,0xF862AE69,0x616BFFD3,0x166CCF45,0xA00AE278,
0xD70DD2EE,0x4E048354,0x3903B3C2,0xA7672661,0xD06016F7,
0x4969474D,0x3E6E77DB,0xAED16A4A,0xD9D65ADC,0x40DF0B66,
0x37D83BF0,0xA9BCAE53,0xDEBB9EC5,0x47B2CF7F,0x30B5FFE9,
0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605,
0xCDD70693,0x54DE5729,0x23D967BF,0xB3667A2E,0xC4614AB8,
0x5D681B02,0x2A6F2B94,0xB40BBE37,0xC30C8EA1,0x5A05DF1B,
0x2D02EF8D
};
internalstaticuintComputeCrc32(uintoldCrc,bytebval)
...{
return(uint)(Crc32.CrcTable[(oldCrc^bval)&0xFF]^(oldCrc>>8));
}
uintcrc=0;
publiclongValue
...{
get
...{
return(long)crc;
}
set
...{
crc=(uint)value;
}
}
publicvoidReset()
...{
crc=0;
}
publicvoidCrc(intbval)
...{
crc^=CrcSeed;
crc=CrcTable[(crc^bval)&0xFF]^(crc>>8);
crc^=CrcSeed;
}
publicvoidCrc(byte[]buffer)
...{
Crc(buffer,0,buffer.Length);
}
publicvoidCrc(byte[]buf,intoff,intlen)
...{
if(buf==null)
...{
thrownewArgumentNullException("buf");
}
if(off<0||len<0||off+len>buf.Length)
...{
thrownewArgumentOutOfRangeException();
}
crc^=CrcSeed;
while(--len>=0)
...{
crc=CrcTable[(crc^buf[off++])&0xFF]^(crc>>8);
}
crc^=CrcSeed;
}
}
}
今晚在试试