Cookie投票程序

   if (!IsPostBack)
        {
            Per();
        }
        
        
       

    }
    protected void btn_toupiao_Click(object sender, EventArgs e)
    {
        string P_str_IP = Request.UserHostAddress.ToString();//获取客户端IP地址
        HttpCookie oldCookie = Request.Cookies["userIP"];
        if (oldCookie == null)
        {
            int flag = RadioButtonList1.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;
            }
            ClientScript.RegisterStartupScript(GetType(), "", "alert(‘投票成功，谢谢参与！‘)", true);
            
            HttpCookie newCookie = new HttpCookie("userIP");//定义新的Cookie对象
            newCookie.Expires = DateTime.MaxValue;//设置Cookie有效时间
            //添加新的Cookie变量IPaddress，值为P_str_IP
            newCookie.Values.Add("IPaddress", P_str_IP);
            Response.AppendCookie(newCookie);//将变量写入Cookie文件中

        }
        else
        { 
            string P_str_oldIP = oldCookie.Values["IPaddress"];
            if (P_str_IP.Trim() == P_str_oldIP.Trim())
            {
                ClientScript.RegisterStartupScript(GetType(), "", "alert(‘您已经投过票了，不能再次投票，谢谢参与！‘)", true);
            }
            else
            {
                HttpCookie newCookie = new HttpCookie("userIP");//定义新的Cookie对象
                newCookie.Expires = DateTime.MaxValue;//设置Cookie有效时间
                //添加新的Cookie变量IPaddress，值为P_str_IP
                newCookie.Values.Add("IPaddress", P_str_IP);
                Response.AppendCookie(newCookie);//将变量写入Cookie文件中
                int flag = RadioButtonList1.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;
                }
                ClientScript.RegisterStartupScript(GetType(), "", "alert(‘投票成功，谢谢参与！‘)", true);
            }
        }
    }
    //绑定投票数的百分比到前端显示
    protected string M_str_rate1;
    protected string M_str_rate2;
    protected string M_str_rate3;
    protected int P_int_count1;
    protected int P_int_count2;
    protected int P_int_count3;
    public void Per()
    {
        P_int_count1 = readCount(Server.MapPath("result1.txt"));
        P_int_count2 = readCount(Server.MapPath("result2.txt"));
        P_int_count3 = readCount(Server.MapPath("result3.txt"));
        int P_int_count = P_int_count1 + P_int_count2 + P_int_count3;
        if (P_int_count == 0)
        {
            
            lblresult.Text = "共有0人参与投票";
        }
        else
        {
            M_str_rate1 = (Convert.ToDouble(P_int_count1) * 100 / Convert.ToDouble(P_int_count)).ToString("0.00") + "%";
            M_str_rate2 = (Convert.ToDouble(P_int_count2) * 100 / Convert.ToDouble(P_int_count)).ToString("0.00") + "%";
            M_str_rate3 = (Convert.ToDouble(P_int_count3) * 100 / Convert.ToDouble(P_int_count)).ToString("0.00") + "%";
            lblBanana.Text = M_str_rate1;
            lblApple.Text = M_str_rate2;
            lblWatermelon.Text = M_str_rate3;
            lblresult.Text = "共有" + P_int_count.ToString() + "人参与投票。";
        }
    }
    //读取指定路径文件中存在的投票数
    public static int readCount(string P_str_path)
    {
        int P_int_count = 0;
        StreamReader sr;
        sr = File.OpenText(P_str_path);
        while (sr.Peek() != -1)
        {
            P_int_count = int.Parse(sr.ReadLine());
        }
        sr.Close();
        return P_int_count;
    }
    //向指定路径文件中写入投票数
    public static void addCount(string P_str_path)
    {
        int P_int_count = readCount(P_str_path);
        P_int_count += 1;
        StreamWriter sw = new StreamWriter(P_str_path, false);
        sw.WriteLine(P_int_count);
        sw.Close();
    }