asp.net 随机抽奖实例

调用方法：RndNum（1） //这里数是几，就是抽几个数

public string RndNum(int VcodeNum) 
        {
            UserInfo ui = (UserInfo)Session["UserInfo"];
            DataTable dt;
            string jiang = "";            
            int temp = -1;
            DataTable table = EntityForum.GetWordNameById(" wordParentId != 0 and wordRemark1 != '0'");  //这里是数据源可以是数组等，我这儿是在数据库的数
            Random rand = new Random();
            for (int g = 1; g < VcodeNum + 1; g++)
            {
               if (temp != -1)
               {
                  rand = new Random(g * temp * unchecked((int)DateTime.Now.Ticks));
               }
               int t = rand.Next(7);//这里是数据源的下标
               if (temp != -1 && temp == t)
               {
                  return RndNum(VcodeNum);
               }
               temp = t;
               jiang = table.Rows[t]["wordName"].ToString();               
            }
            return jiang;
        }