如何使用asp.net Web应用程序获取cookie？

所有.我有一点编码问题,希望你能帮助我.我正在为我的工作制作一个秒表计时器.我的老板想为公司制定一个程序,帮助跟踪员工分配任务的时间.我被告知我应该使用asp.net,这是我以前从未使用过的.我设法使计时器工作到一定程度,除了保存会话外,它还能完成它应该做的一切.我需要做的最后一件事是,如果用户关闭窗口或重新加载页面,则能够让计时器仍然滴答作响.我认为最好的方法是使用cookies.视图状态本身工作正常,但它不会在重新加载时保存计时器值.如果我在选项卡中打开一个新页面,它会启动所有内容.我发现了如何制作饼干,但我不相信我正确使用它们.如果有人能帮我解决这个问题,我将不胜感激.

这是aspx代码(我在那里有一些javascript,因为我试图看到以这种方式实现计时器,以便它更准确,所以请忽略它)：

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="NerdcoreTimer._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
 <script type="text/javascript">
   var seconds = 0;
   var minutes = 0;
   var hours = 0;
   var tick;

  function stopCount() {
    clearTimeout(t);
  }

function startCount() {
    document.getElementById('seconds').innerHTML = seconds;
    document.getElementById('minutes').innerHTML = minutes;
    document.getElementById('hours').innerHTML = hours;
    seconds = seconds + 1;
    if (seconds == 60) {
        seconds = 0;
        minutes = minutes + 1;
    }
    if (minutes == 60) {
        minutes = 0;
        hours = hours + 1;
    }
    tick = setTimeout("startCount()",1000)
}

function reset() {
    seconds = 0;
    minutes = 0;
    hours = 0;
    document.getElementById('seconds').innerHTML = seconds;
    document.getElementById('minutes').innerHTML = minutes;
    document.getElementById('hours').innerHTML = hours;
}

function startTimer() { return $find('Timer1')._startTimer(); }
function stopTimer() { return $find('Timer1')._stopTimer(); }
</script>

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>

<div>
    <table align="center">
        <tr>
            <td>
                <asp:DropDownList ID="Tasks" runat="server" Width="75px">
                    <asp:ListItem>Task 1</asp:ListItem>
                    <asp:ListItem>Task 2</asp:ListItem>
                    <asp:ListItem>Task 3</asp:ListItem>
                    <asp:ListItem>Task 4</asp:ListItem>
                    <asp:ListItem>Task 5</asp:ListItem>
                    <asp:ListItem>Task 6</asp:ListItem>
                </asp:DropDownList>
            </td>
            <td style="text-align:center">
                <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                    <ContentTemplate>
                        <asp:Timer ID="Timer1" runat="server" Enabled="false" Interval="879" OnTick="Timer1_Tick"></asp:Timer>
                        <asp:Label ID="hour2" runat="server" Text="0"></asp:Label>
                        <asp:Label ID="hour1" runat="server" Text="0"></asp:Label>
                        <asp:Label ID="colon1" runat="server" Text=":"></asp:Label>
                        <asp:Label ID="min2" runat="server" Text="0"></asp:Label>
                        <asp:Label ID="min1" runat="server" Text="0"></asp:Label>
                        <asp:Label ID="colon2" runat="server" Text=":"></asp:Label>
                        <asp:Label ID="sec2" runat="server" Text="0"></asp:Label>
                        <asp:Label ID="sec1" runat="server" Text="0"></asp:Label>
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
            <td>
                <asp:Button ID="Start" runat="server" OnClientClick="startTimer()" Text="Start" Width="75px" OnClick="Start_Click" />
            </td>
        </tr>
        <tr>
            <td>&nbsp;</td>
            <td>
                <asp:Button ID="Stop" runat="server" OnClientClick="stopTimer()" Text="Stop" Width="75px" OnClick="Stop_Click" />
                <asp:Button ID="Reset" runat="server"  Text="Reset" Width="75px" OnClick="Reset_Click" />
            </td>
        </tr>
    </table>
</div>
&nbsp
<div>
    <table align="center">
        <tr>
            <td style="text-align:center">
            <asp:UpdatePanel ID="UpdatePanel2" runat="server">
                    <ContentTemplate>
                        <asp:Label ID="startDate" runat="server" Text="Start Date: "></asp:Label>
                        <asp:Label ID="startTime" runat="server" Text=""></asp:Label>
                        <hr />
                        <asp:Label ID="stopDate" runat="server" Text="Stop Date: "></asp:Label>
                        <asp:Label ID="stopTime" runat="server" Text=""></asp:Label>
                        <hr />
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>
    </table>
</div>
&nbsp
<div>
    <table align="center">
        <tr>
            <td style="text-align:center">
            <asp:UpdatePanel ID="UpdatePanel3" runat="server">
                <ContentTemplate>
                        <asp:Label ID="hours" runat="server" ></asp:Label>
                        <asp:Label ID="minutes" runat="server" ></asp:Label>
                        <asp:Label ID="seconds" runat="server" ></asp:Label>
                </ContentTemplate>
            </asp:UpdatePanel>
            </td>
            <td>
            <asp:UpdatePanel ID="UpdatePanel4" runat="server">
                <ContentTemplate>
                    <asp:Button ID="Button1" runat="server" OnClientClick="startCount()" Text="Start" Width="75px"/>
                </ContentTemplate>
            </asp:UpdatePanel>
            </td>
        </tr>
        <tr>
            <td>&nbsp;</td>
            <td>
            <asp:UpdatePanel ID="UpdatePanel5" runat="server">
                <ContentTemplate>
                    <asp:Button ID="Button2" runat="server" OnClientClick="stopCount()" Text="Stop" Width="75px"/>
                    <asp:Button ID="Button3" runat="server" OnClientClick="reset()" Text="Reset" Width="75px"/>
                </ContentTemplate>
            </asp:UpdatePanel>
            </td>
        </tr>
    </table>
</div>

这是C#中的代码隐藏文件：

using System;
 using System.Data.SqlClient;
 using System.Configuration;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using System.Timers;

 namespace NerdcoreTimer
 {
  public partial class _Default : System.Web.UI.Page
  {
    public int time_sec;
    public int time_min;
    public int time_hour;
    public string start;
    public string stop;

    HttpCookie cookieStartDate = new HttpCookie("startDate");
    HttpCookie cookieTask = new HttpCookie("task");
    HttpCookie cookieSec = new HttpCookie("seconds");
    HttpCookie cookieMin = new HttpCookie("minutes");
    HttpCookie cookieHr = new HttpCookie("hours");
    HttpCookie cookieStopDate = new HttpCookie("stopDate");

    //SQL connection string
    System.Data.SqlClient.SqlConnection sqlConnection1 =
    new System.Data.SqlClient.SqlConnection("Server=*****;Database=*****;User Id=*****;Password=*****;");

    protected void Page_Load(object sender,EventArgs e)
    {
        //Check to see if there are cookies
        if (Request.QueryString["startDate"] != null)
        {
            ReadCookie_StartDate();
        }
        if ((Request.QueryString["seconds"] != null) && (Request.QueryString["minutes"] != null) && (Request.QueryString["hours"] != null))
        {
            ReadCookie_Timer();
            //If the cookie values for seconds,minutes,and hours is not null,enable the timer and disable and enable the proper controls
            Timer1.Enabled = true;
            Stop.Enabled = true;

            Start.Enabled = false;
            Tasks.Enabled = false;
        }
        if (Request.QueryString["stopDate"] != null)
        {
            ReadCookie_StopDate();
        }

        //Open the sql connection
        sqlConnection1.Open();

        //Disable these controls on page load
        Stop.Enabled = false;
        Reset.Enabled = false;

        //Make sure the timer is disabled if starting a new session
        if (!IsPostBack)
        {
            Timer1.Enabled = false;
        }
    }

    protected void ReadCookie_StartDate()
    {
        //Get the cookie names
        String strCookieStart = Request.QueryString["startDate"].ToString();
        String strCookieTask = Request.QueryString["task"].ToString();

        //Grab the cookies
        HttpCookie cookieStart = Request.Cookies[strCookieStart];
        HttpCookie cookieTask = Request.Cookies[strCookieTask];

        //Check to make sure the cookies exist
        if ((cookieStart != null)&&(cookieTask != null))
        {
            String strCookieStartValue = cookieStart.Value.ToString();
            startTime.Text = strCookieStartValue;
            String strCookieTaskValue = cookieTask.Value.ToString();
            Tasks.SelectedValue = strCookieTaskValue;
        }
    }

    protected void ReadCookie_Timer()
    {
        //Get the cookie names
        String strCookieSec = Request.QueryString["seconds"].ToString();
        String strCookieMin = Request.QueryString["minutes"].ToString();
        String strCookieHr = Request.QueryString["hours"].ToString();

        //Grab the cookies
        HttpCookie cookieSec = Request.Cookies[strCookieSec];
        HttpCookie cookieMin = Request.Cookies[strCookieMin];
        HttpCookie cookieHr = Request.Cookies[strCookieHr];

        //Check to make sure the cookies exist
        if ((cookieSec != null)&&(cookieMin != null)&&(cookieHr != null))
        {
            String strCookieSecValue = cookieSec.Value.ToString();
            String strCookieMinValue = cookieMin.Value.ToString();
            String strCookieHrValue = cookieHr.Value.ToString();
            sec1.Text = strCookieSecValue;
            min1.Text = strCookieMinValue;
            hour1.Text = strCookieHrValue;
        }
    }

    protected void ReadCookie_StopDate()
    {
        //Get the cookie name
        String strCookieStop = Request.QueryString["stopDate"].ToString();

        //Grab the cookie
        HttpCookie cookieStop = Request.Cookies[strCookieStop];

        //Check to make sure the cookie exists
        if (cookieStop != null)
        {
            String strCookieStopValue = cookieStop.Value.ToString();
            stopTime.Text = strCookieStopValue;
        }
    }

    protected void Start_Click(object sender,EventArgs e)
    {
        //Start the timer
        Timer1.Enabled = true;

        //Get the start date
        start = DateTime.Now.ToString();
        if (startTime.Text == "")
        {
            startTime.Text = start;
        }

        //Store the start date in a cookie
        Start_Session();

        //Enable these controls
        Stop.Enabled = true;

        //Disable these controls
        Start.Enabled = false;
        Tasks.Enabled = false;
        Reset.Enabled = false;
    }

    protected void Timer1_Tick(object sender,EventArgs e)
    {
        //Add to the sec1 label
        time_sec = int.Parse(sec1.Text);
        time_sec = time_sec + 1;
        sec1.Text = time_sec.ToString();

        //Hide the sec2 label
        if (sec1.Text == "10")
        {
            sec2.Visible = false;
        }

        //Add to the min1 label
        if (sec1.Text == "60")
        {
            sec2.Visible = true;
            time_min = int.Parse(min1.Text);
            sec1.Text = "0";
            time_min = time_min + 1;
            min1.Text = time_min.ToString();
        }

        //Hide the min1 label
        if (min1.Text == "10")
        {
            min2.Visible = false;
        }

        //Add to the hour1 label
        if (min1.Text == "60")
        {
            min2.Visible = true;
            time_hour = int.Parse(hour1.Text);
            min1.Text = "0";
            time_hour = time_hour + 1;
            hour1.Text = time_hour.ToString();
        }

        //Hide the hour2 label
        if (hour1.Text == "10")
        {
            hour2.Visible = false;
        }

        //Store the sec1,min1,and hour1 values into cookies
        TimerTick_Session();
    }

    protected void Stop_Click(object sender,EventArgs e)
    {
        //Get the stop date
        stop = DateTime.Now.ToString();
        stopTime.Text = stop;

        //Store the stop date in a cookie
        Stop_Session();

        //Disable the timer and this control
        Timer1.Enabled = false;
        Stop.Enabled = false;

        //Enable these controls
        Start.Enabled = true;
        Reset.Enabled = true;

        //Store the selected task,start date,stop date and totalTime
        string tsk = Tasks.SelectedValue;
        string dateStart = startTime.Text;
        string dateStop = stopTime.Text;

        //Create a sql query string
        string sqlString = "INSERT TimeSheet (Task,DateStart,DateStop) VALUES (@Task,@DateStart,@DateStop)";

        //Create a sql command using the query string
        System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sqlString);

        //Add the selected task value,start date value,stop date and totalTime values to the query
        cmd.Parameters.AddWithValue("@Task",tsk);
        cmd.Parameters.AddWithValue("@DateStart",dateStart);
        cmd.Parameters.AddWithValue("@DateStop",dateStop);

        //Give the sql command a connection string
        cmd.Connection = sqlConnection1;

        //Execute the sql command
        cmd.ExecuteNonQuery();

        //Close the sql connection
        sqlConnection1.Close();
    }

    protected void Reset_Click(object sender,EventArgs e)
    {
        //Clear the start and stop date labels
        startTime.Text = "";
        stopTime.Text = "";

        //Reset these counters
        time_sec = 0;
        time_min = 0;
        time_hour = 0;

        //Reset the timer labels
        sec1.Text = "0";
        min1.Text = "0";
        hour1.Text = "0";

        //Make visible these timer labels
        sec2.Visible = true;
        min2.Visible = true;
        hour2.Visible = true;

        //Disable the timer and these controls
        Timer1.Enabled = false;
        Reset.Enabled = false;
        Stop.Enabled = false;

        //Enable these controls
        Start.Enabled = true;
        Tasks.Enabled = true;
    }

    protected void Start_Session()
    {
        //Create a new cookie for the start date and selected task
        //HttpCookie cookieStartDate = new HttpCookie("startDate");
        //HttpCookie cookieTask = new HttpCookie("task");

        //Set the cookie values
        cookieStartDate.Value = start;
        cookieTask.Value = Tasks.SelectedValue;

        //Set the cookie to expire in about 8 hours
        DateTime startDateExp = DateTime.Now;
        TimeSpan startDateExpMin = new TimeSpan(0,500,0);
        cookieStartDate.Expires = startDateExp + startDateExpMin;
        DateTime taskExp = DateTime.Now;
        TimeSpan taskExpMin = new TimeSpan(0,0);
        cookieTask.Expires = taskExp + taskExpMin;

        //Add the cookie
        Response.Cookies.Add(cookieStartDate);
        Response.Cookies.Add(cookieTask);
    }

    protected void TimerTick_Session()
    {
        //Create a new cookies for the timer
        /*HttpCookie cookieSec = new HttpCookie("seconds");
        HttpCookie cookieMin = new HttpCookie("minutes");
        HttpCookie cookieHr = new HttpCookie("hours");*/

        //Set the cookie values
        cookieSec.Value = sec1.Text;
        cookieMin.Value = min1.Text;
        cookieHr.Value = hour1.Text;

        //Set the cookies to expire in about 8 hours
        DateTime secExp = DateTime.Now;
        TimeSpan secExpMin = new TimeSpan(0,0);
        cookieSec.Expires = secExp + secExpMin;
        DateTime minExp = DateTime.Now;
        TimeSpan minExpMin = new TimeSpan(0,0);
        cookieMin.Expires = minExp + minExpMin;
        DateTime hrExp = DateTime.Now;
        TimeSpan hrExpMin = new TimeSpan(0,0);
        cookieHr.Expires = hrExp + hrExpMin;

        //Add the cookies
        Response.Cookies.Add(cookieSec);
        Response.Cookies.Add(cookieMin);
        Response.Cookies.Add(cookieHr);
    }

    protected void Stop_Session()
    {
        //Create a new cookie for the stop date
        //HttpCookie cookieStopDate = new HttpCookie("stopDate");

        //Set the cookie value
        cookieStopDate.Value = stop;

        //Set the cookie to expire in about 8 hours
        DateTime stopDateExp = DateTime.Now;
        TimeSpan stopDateExpMin = new TimeSpan(0,0);
        cookieStopDate.Expires = stopDateExp + stopDateExpMin;

        //Add the cookie
        Response.Cookies.Add(cookieStopDate);
        }
    }
}

任何帮助获取此代码以保存会话状态将不胜感激.谢谢.