使用RNGCryptoServiceProvider 做种，可以在一秒内产生的随机数重复率非常的低，对于以往使用时间做种的方法是个升级，代码如下：
using System;
using System.Security.Cryptography;
namespace ArLi.CommonPrj
{
///
/// 随机密码
///
public sealed class RandomStr {
public const string myVersion = "1.2";
/********
* Const and Function
* ********/
private static readonly int defaultLength = 8;
private static int GetNewSeed(){
byte[] rndbytes = new byte[4];
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
rng.GetBytes(rndBytes);
return BitConverter.ToInt32(rndBytes,0);
}
/********
* getRndCode of all char .
* ********/
private static string BuildRndCodeAll(int strLen) {
System.Random RandomObj = new System.Random(GetNewSeed());
string buildRndCodeReturn = null;
for(int i=0; i
}
return buildRndCodeReturn;
}
public static string GetRndStrOfAll() {
return BuildRndCodeAll(defaultLength);
}
public static string GetRndStrOfAll(int LenOf) {
return BuildRndCodeAll(LenOf);
}
/********
* getRndCode of only .
* ********/
private static string sCharLow = "abcdefghijklmnopqrstuvwxyz";
private static string sCharUpp = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static string sNumber = "0123456789";
private static string BuildRndCodeOnly(string StrOf,int strLen) {
System.Random RandomObj = new System.Random(GetNewSeed());
string buildRndCodeReturn = null;
for(int i=0; i
}
return buildRndCodeReturn;
}
public static string GetRndStrOnlyFor() {
return BuildRndCodeOnly(sCharLow + sNumber,defaultLength);
}
public static string GetRndStrOnlyFor(int LenOf) {
return BuildRndCodeOnly(sCharLow + sNumber,LenOf);
}
public static string GetRndStrOnlyFor(bool bUseUpper,bool bUseNumber) {
string strTmp = sCharLow;
if (bUseUpper) strTmp += sCharUpp;
if (bUseNumber) strTmp += sNumber;
return BuildRndCodeOnly(strTmp,defaultLength);
}
public static string GetRndStrOnlyFor(int LenOf,bool bUseUpper,bool bUseNumber) {
string strTmp = sCharLow;
if (bUseUpper) strTmp += sCharUpp;
if (bUseNumber) strTmp += sNumber;
return BuildRndCodeOnly(strTmp,LenOf);
}
}
}
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/10752019/viewspace-959167/ ，如需转载，请注明出处，否则将追究法律责任。
