Asp.net定时控件

核心提示：using System;using System.Web.UI;using System.Web.UI.WebControls;using System.ComponentModel;[assembly:TagPRefix("Beyondbit.App.Web.UI.WebControls", &

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
 
 /// <summary>
 /// 客户端定时器
 /// </summary>
 [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 = "<script language='javascript'>" +
　　"window.setTimeout( "+clientFunction+" , "+ this.signalTime +" );" +
　　"function " + clientFunction + "(){" +
　　 Page.GetPostBackEventReference( this , "" + this.signalTime ) +
　　";}" +
　　"</script> ";
　 Page.RegisterStartupScript( jsId , js );　}　/// <summary>
　/// 将此控件呈现给指定的输出参数。
　/// </summary>
　/// <param name="output"> 要写出到的 Html 编写器 </param>
　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
 }
}