《ASP.NET1200例》C#在网页上编写动态时钟

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包含Timer类的命名空间有3个

Timer Class (System.Windows.Forms)‎ 一般用于窗体程序

using System;

using System.Timers;

class Program
    {              
       public  static void Main()
        {
            Timer  t = new System.Timers.Timer(1000);       
            t.Interval = 2000;
           //t.AutoReset = false; //每到指定时间Elapsed事件是触发一次（false），还是一直触发（true）
            t.Enabled = true; //是否触发Elapsed事件
            t.Elapsed += new ElapsedEventHandler(t_Elapsed);

            Console.WriteLine("Press the Enter key to exit the program.");
           //从标准输入流读取下一行
            Console.ReadLine();
            // Keep the timer alive until the end of Main.
            GC.KeepAlive(t);          
        }

        static void t_Elapsed(object sender, ElapsedEventArgs e)
        {            
            Console.WriteLine("hello world!!");            
        }
    }

一般用于web程序

using System.Web.UI;
protected void Page_Load(object sender, EventArgs e)
        {
            Label1.Text = DateTime.Now.ToString();
            Timer1.Interval = 1000;
            Timer1.Enabled = true;
            Timer1.Tick += new EventHandler<EventArgs>(Timer1_Tick);
            
        }

        void Timer1_Tick(object sender, EventArgs e)
        {
            Label1.Text = DateTime.Now.ToString();
        }

此时前端代码.aspx

<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    
    <div>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
        
            <asp:Timer ID="Timer1"
                runat="server">
            </asp:Timer>
        
    </div>
    </form>
</body>