ASP.NET 返回随机数实现代码

/// <summary>
/// 返回随机数
/// </summary>
/// <param name="vcodenum"></param>
/// <returns></returns>
public string rndnum(int vcodenum)
{
string vchar = "0,1,2,3,4,5,6,7,8,9";
string[] vcarray = vchar.split(',');
string vnum = "";//由于字符串很短，就不用stringbuilder了
int temp = -1;//记录上次随机数值，尽量避免生产几个一样的随机数
//采用一个简单的算法以保证生成随机数的不同
random rand = new random();
for (int i = 1; i < vcodenum + 1; i++)
{
if (temp != -1)
{
rand = new random(i * temp * unchecked((int)datetime.now.ticks));
}
//int t = rand.next(35) ;
int t = rand.next(9);
if (temp != -1 && temp == t)
{
return rndnum(vcodenum);
}
temp = t;
vnum += vcarray[t];
}
return vnum;
}