随机验证码

private string RndNum(int VcodeNum)<br> {<br> string Vchar="0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p"+<br> ",q,r,s,t,u,v,w,x,y,z";<br> string[] VcArray=Vchar.Split(new Char [] {','});<br> string VNum="";<br> int temp=-1;
<p> Random rand=new Random();<br><br> for(int i=1;i&lt;VcodeNum+1;i++)<br> {<br> if(temp!=-1)<br> {<br> rand=new Random(i*temp*unchecked((int)DateTime.Now.Ticks));<br> }<br><br> int t=rand.Next(35);<br> if(temp!=-1&amp;&amp;temp==t)<br> {<br> return RndNum(VcodeNum);<br> }<br> temp=t;<br> VNum+=VcArray[t];<br> }<br> return VNum;<br> }</p>