此博客展示了ASP.NET中客户端定时器类的实现代码。定义了ElapsedEventArgs类和ClientTimer类，ClientTimer类可设置定时时间、启用状态等，还包含停止定时器方法，在OnPreRender方法中处理JS脚本，同时实现了IPostBackEventHandler接口相关方法。
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
[assembly:TagPrefix("Beyondbit.App.Web.UI.WebControls", "BBit")]
namespace Beyondbit.App.Web.UI.WebControls
{
#region ElapsedEventArgs class
public class ElapsedEventArgs : EventArgs
{
public int SignalTime;
}
#endregion
///
/// 客户端定时器
///
[DefaultProperty("Enabled"),
ToolboxData("<{0}:ClientTimer runat=server></{0}:ClientTimer>")]
public class ClientTimer : System.Web.UI.Control , System.Web.UI.IPostBackEventHandler // , System.Web.UI.IPostBackDataHandler
{
public delegate void ElapsedEventHandler( object sender, ElapsedEventArgs e );
public event ElapsedEventHandler Elapsed;
protected virtual void OnElapsed( ElapsedEventArgs e)
{
if ( Elapsed != null )
Elapsed(this, e);
}
private int signalTime = 0;
private int interval = 0 ;
[Description("设置或获取定时时间(毫秒)")]
public int Interval
{
set
{
if( value <= 0 )
throw new ArgumentException( "Interval时间间隔不能小于或等于0" );
interval = value ;
}
get
{
return interval ;
}
}
private bool enabled = false ;
[Description("设置或获取定时器是否启用")]
public bool Enabled
{
set{ enabled = value ; }
get{ return enabled ; }
}
//public bool AutoReset = false ;
[Description("停止定时器")]
public void Stop()
{
enabled = false ;
}
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender (e);
if( this.enabled == false ) return;
if( interval == 0 ) throw new ArgumentException( "定时器已启动，但Interval时间间隔没有设置" );
//js
string jsId = this.UniqueID + "_js";
string clientFunction = this.UniqueID + "_OnElapsed";
signalTime = signalTime + this.interval ;
string js = " ";
Page.RegisterStartupScript( jsId , js );
}
///
/// 将此控件呈现给指定的输出参数。
///
/// 要写出到的 HTML 编写器
protected override void Render(HtmlTextWriter output)
{
//output.Write(Text);
}
#region IPostBackEventHandler 成员
public void RaisePostBackEvent( string eventArgument )
{
if( eventArgument == "" ) throw new Exception( "eventArgument参数为空！" );
signalTime = int.Parse( eventArgument ) ;
ElapsedEventArgs e = new ElapsedEventArgs();
e.SignalTime = signalTime ;
this.OnElapsed( e );
}
#endregion
#region IPostBackDataHandler 成员
// public void RaisePostDataChangedEvent()
// {
// // TODO: 添加 ClientTimer.RaisePostDataChangedEvent 实现
// }
//
// public bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
// {
// // TODO: 添加 ClientTimer.LoadPostData 实现
//
// string s = postCollection[ this.UniqueID + "_signalTime" ];
// if( s == null || s == "" ) return false;
//
// signalTime = Convert.ToInt32( s );
//
// return false;
// }
#endregion
}
}
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