Using Timer
1.Aspx code
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:HiddenField ID="FinishTime" runat="server" />
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<br />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" Interval="1000" ontick="Timer1_Tick">
</asp:Timer>
<asp:Label ID="labTimes" runat="server" Width="155px"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
2.CS Code
public partial class DemoTimer : System.Web.UI.Page
{
private double TotalTime = 0.01;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.FinishTime.Value = DateTime.Now.AddHours(TotalTime).ToString("yyyy/MM/dd HH:mm:ss");
}
}
protected void Timer1_Tick(object sender, EventArgs e)
{
DateTime finishTime = DateTime.Parse(this.FinishTime.Value);
if (DateTime.Now >= finishTime) //如果设置的时间已过
{
this.Timer1.Enabled = false; //将Timmer置为false
this.labTimes.Text = "时间到！";
}
else
{
RefreshTime(); //刷新时间
}
}
private void RefreshTime() //刷新时间的方法
{
TimeSpan ts = DateTime.Parse(this.FinishTime.Value) - DateTime.Now; //时间差
this.labTimes.Text = ts.Hours.ToString().PadLeft(2, '0') + ":" + ts.Minutes.ToString().PadLeft(2, '0') + ":" + ts.Seconds.ToString().PadLeft(2, '0');
}
}
