如何在asp.net中使Ajax计时器正确递减

本文关键字：计时器 Ajax 中使 asp net | 更新日期: 2023-09-27 18:09:27

我正在做一个在线考试项目，在这个项目中我必须显示一个倒计时，直到考试结束。我使用了以下代码:

aspx代码:

<asp:ScriptManager ID= "SM1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel id="updPnl" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblTimer" style=" margin-top:35px; margin-left:825px;" runat="server"  Font-Bold="True" Font-Names="Arial" Font-Size="X-Large" ForeColor="#6600CC"></asp:Label>
<div style="margin-right:25px;">
<asp:AlwaysVisibleControlExtender ID="AlwaysVisibleControlExtender1"  runat="server" TargetControlID="lblTimer">
 </asp:AlwaysVisibleControlExtender>
<asp:Timer ID="timer1" runat="server"
Interval="1000" OnTick="timer1_tick"></asp:Timer>    
     </div>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="timer1" EventName ="tick" />
</Triggers>
</asp:UpdatePanel>

后面的代码是:

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        bind();
        bind1();
        Result();
        Session["Result"] = lblshow.Text;
     if (!SM1.IsInAsyncPostBack)
    {
        SqlConnection sqlc1 = new SqlConnection(strcon);
        sqlc1.Open();
        String str = "select top 1 * from TestCreated order by Id desc";
        SqlCommand cmd1 = new SqlCommand(str, sqlc1);
        //sqlc.Open();
        SqlDataReader dr = cmd1.ExecuteReader();
        if (dr.Read())
        {
            Session["timeout1"] = dr["TestDuration"].ToString();
        }
        Session["timeout"] DateTime.Now.AddMinutes(Convert.ToInt32(Session["timeout1"].ToString())).ToString();
    }
    }    
}
protected void timer1_tick(object sender, EventArgs e)
{
    if (Session["timeout"] == null)
    Session["time"] = DateTime.Now.AddSeconds(10);
    if (0 > DateTime.Compare(DateTime.Now, DateTime.Parse(Session["timeout"].ToString())))
    {
        lblTimer.Text = string.Format("Time Left: 00:{0}:{1}",                     ((Int32)DateTime.Parse(Session["timeout"].ToString()).Subtract(DateTime.Now).TotalMinutes).ToString(), ((Int32)DateTime.Parse(Session["timeout"].ToString()).Subtract(DateTime.Now).Seconds).ToString());
    }

这段代码在本地服务器上工作得很好，但是当我在我的web服务器上部署它时，计时器没有正确计数，它减少了4秒和5秒，就像这样。甚至我试着改变我的计时器间隔，但它不起作用。我怎样才能使这个计时器正确倒计时?

如何在asp.net中使Ajax计时器正确递减

// Add the ScriptManager and Timer Control.
<div>
<asp:ScriptManager ID= "SM1" runat="server"></asp:ScriptManager>
<asp:Timer ID="timer1" runat="server" 
Interval="1000" OnTick="timer1_tick"></asp:Timer>
</div>
//   Add the update panel, 
//a label to show the time remaining and the AsyncPostBackTrigger.   
<div>
<asp:UpdatePanel id="updPnl" 
runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblTimer" runat="server"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="timer1" EventName ="tick" />
</Triggers>
</asp:UpdatePanel>
</div>

这将为您工作@Skoar..

关于代码项目的更多细节

aspx code is:

protected void timer1_tick(object sender, EventArgs e)
    {
        if (0 > DateTime.Compare(DateTime.Now, 
        DateTime.Parse(Session["timeout"].ToString())))
        {
            lblTimer.Text = "Number of Minutes Left: " + 
            ((Int32)DateTime.Parse(Session["timeout"].
            ToString()).Subtract(DateTime.Now).TotalMinutes).ToString();
        }
}
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