//投票    PRotected void btn_Vote_Click(object sender, EventArgs e)    {        string useripAddress = Request.UserHostAddress.ToString();//獲取用戶本地的IP地址        HttpCookie oldCookie=Request.Cookies["UserIP"];//創建Cookie對象        if (oldCookie == null)//該用戶沒有投票記錄        {            int flag = this.rbl_Evaluate.SelectedIndex;//獲取用戶投票的選項            switch (flag)            {                case 0: AddCount(Server.MapPath("Result1.txt")); break;                case 1: AddCount(Server.MapPath("Result2.txt")); break;                case 2: AddCount(Server.MapPath("Result3.txt")); break;                default:                    break;            }            Page.RegisterClientScriptBlock("", "<script>alert('投票成功，謝謝您的參與')<script>");            HttpCookie newCookie = new HttpCookie("UserIP");//創建新的Cookie對象            newCookie.Expires = DateTime.MaxValue;//設置Cookie的有效時間            newCookie.Values.Add("IPAddress", userIpAddress);//添加用戶的IP地址在Cookie中，保存起來            Response.AppendCookie(newCookie);//將變量寫入Cookie文件中        }        else        {            string userOldAddress = oldCookie.Values["IPAddress"].ToString();            if (userIpAddress.Trim() == userOldAddress.Trim())//創建Cookie對象            {                Page.RegisterClientScriptBlock("", "<script>alert('每天只能投票一次，謝謝您的光顧！！')</script>");            }            else            {                HttpCookie newCookie = new HttpCookie("UserIP");//創建新的Cookie對象                newCookie.Values.Add("IpAddress", userIpAddress);                newCookie.Expires = DateTime.MaxValue;                Response.AppendCookie(newCookie);                int flag = this.rbl_Evaluate.SelectedIndex;                switch (flag)                {                    case 0: AddCount(Server.MapPath("Result1.txt")); break;                    case 1: AddCount(Server.MapPath("Result2.txt")); break;                    case 2: AddCount(Server.MapPath("Result3.txt")); break;                    default:                        break;                }                Page.RegisterClientScriptBlock("", "<script>alert('投票成功謝謝您的參與')</script>");            }        }    }    

    /// <summary>    /// 讀取文本文件中的數字    /// </summary>    /// <param name="str_path">文本文件的路徑</param>    /// <returns>返回結果</returns>    protected static int ReadCount(string str_path)    {        int count = 0;//創建整形的變量        System.IO.StreamReader srd;//創建流讀取對象        srd = System.IO.File.OpenText(str_path);//打開指定的文本文件        if (srd.Peek()!=-1)//如果有數據        {            count = int.Parse(srd.ReadLine());//讀取文本文件的數字賦值給count        }        srd.Close();//關閉流對象        return count;      }

    /// <summary>    /// 對現有的投票數進行增加    /// </summary>    /// <param name="str_path">文本文件的路徑</param>    protected static void AddCount(string str_path)    {        int count = ReadCount(str_path);        count += 1;        System.IO.StreamWriter swr = new System.IO.StreamWriter(str_path);//將數據的記錄寫入文件        swr.WriteLine(count);        swr.Close();    }