生成十六位字符串（不重复）

using System;

namespace GetSysID

{

/// <summary>

/// SysID 的摘要说明。

/// </summary>

public class GetSysID

{

public GetSysID()

{

//

// TODO: 在此处添加构造函数逻辑

//

}

public string sysid()

{

string sysID,LC,LC1,ss;

string year,day,hour,minute,sec,msec;

year = System.DateTime.Now.Year.ToString();

day = System.DateTime.Now.DayOfYear.ToString();

hour = System.DateTime.Now.Hour.ToString();

minute = DateTime.Now.Minute.ToString();

sec = DateTime.Now.Second.ToString();

msec = DateTime.Now.Millisecond.ToString();

if (year.Length == 4)

{

year = year.Substring(2,2);

}

LC1 = "";

LC1 = LC1 + ChangStr(true,year,"0",2);

LC1 = LC1 + ChangStr(true,day,"0",3);

LC1 = LC1 + ChangStr(true,hour,"0",2);

LC1 = LC1 + ChangStr(true,sec,"0",2);

long t;

t = Convert.ToInt64(LC1);

LC1 = "";

LC1 = IntToHex(t,8);

ss = ChangStr(true,sec,"0",2);

t = Convert.ToInt64(ss);

LC1 = LC1 + IntToHex(t,2);

LC1 = LC1 + IntToHex(Convert.ToInt64(msec),3);

//64进制

ss = System.Guid.NewGuid().ToString();

LC = ss.Substring(0,8);

LC = CheckID(LC);

LC1 = LC1 + ChangStr(true,LC,"0",8);

ss = "";

ss = LC1.Substring(1,8);

sysID = HexTo36(ss,6);

ss= LC1.Substring(8,13);

sysID = sysID + HexTo36(ss,10);

return sysID;

}

//转换为十六进制数据

private string IntToHex(long num,int len)

{

string lcHexStr,strHex;

lcHexStr = "0123456789ABCDEF";

int lMod,len1;

lMod = 0;

strHex = "";

while (num > 0)

{

lMod = (int)(num % 16);

num = num / 16;

strHex = lcHexStr.Substring(lMod ,1) + strHex;

}

len1 = strHex.Length;

if (len1 < len )

strHex = ChangStr(true,strHex,"0",len);

return strHex;

}

//改变字符串的到指定的长度

private string ChangStr(bool bISF,string strHex,string subStr,int @len)

{

int len1;

len1 = len - strHex.Length;

for (int i = 0; i < len1; i++)

{

if (bISF == true)

strHex = subStr + strHex;

else

strHex = strHex + subStr;

}

return strHex;

}

//检查字符串

private string CheckID(string str)

{

string outStr;

char charStr;

int len;

outStr = "";

str = str.ToUpper();

len = str.Length;

for (int i =0; i < len; i++ )

{

charStr = str[i];

if ((((int)charStr >= 48 ) && ((int)charStr <= 59)) || (((int)charStr >= 65 ) && ((int)charStr <= 70)))

{

outStr = outStr + charStr;

}

else

outStr = outStr + IntToHex((int)charStr,0);

}

if (outStr.Length > 8)

outStr = outStr.Substring(0,8);

return outStr;

}

//转换成36进制

private string HexTo36(string strHex,int len)

{

string str62,lc62Str;

lc62Str = "0123456789" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

str62 = "";

int lMod = 0;

long num1 = 0;

//转换成十进制

long lnsHex = 1;

strHex = strHex.ToUpper();

int len1;

len1 = strHex.Length ;

while (len1 > 0)

{

char ss;

ss = strHex[(len1 -1)];

num1 = num1 + (lc62Str.IndexOf(ss) ) * lnsHex;

if (len1 == 1)

lnsHex = 16;

else

lnsHex = lnsHex * 16;

len1 --;

//listBox1.Items.Add(num1.ToString());

}

//MessageBox.Show(num1.ToString());

//转换成36进制

str62 ="";

while (num1 > 0)

{

lMod = (int)(num1 % 36);

num1 = num1 / 36;

str62 = lc62Str.Substring(lMod ,1) + str62;

}

len1 = str62.Length;

if (len1 < len)

{

str62 = ChangStr(true,str62,"0",len);

}

return str62;

}

}

}