Timer组件。。抄的

Timer控件   1using System;  2using System.Web.UI;  3using System.ComponentModel;  4using System.Collections;  5using System.Text;  6  7namespace PowerAsp.NET.Controls  8{  9    /**//// <summary> 10    /// 书上抄的定时器例子。 11    /// </summary> 12    ///  13     14    public class WebTimer:Control,IPostBackEventHandler 15    { 16        public WebTimer() 17        { 18        } 19        private member#region private member 20        private int _interval = 5000; 21        private bool _enabled = false; 22        private static readonly object EventTimer = new object(); 23        #endregion 24 25        property#region property 26        [Browsable(false)] 27        public bool Visible 28        { 29            get 30            { 31                return base.Visible; 32            } 33            set 34            { 35                base.Visible = value; 36            } 37        } 38 39        [   DefaultValue(5000), 40        Bindable(false), 41        Description("每次刷新的间隔") 42        ] 43        public int Interval 44        { 45            get 46            { 47                return _interval; 48            } 49            set 50            { 51                _interval = value; 52            } 53        } 54        [ 55        DefaultValue(false), 56        Bindable(false), 57        Description("Timer是否可用") 58        ] 59        public bool Enabled 60        { 61            get 62            { 63                return _enabled; 64            } 65            set 66            { 67                _enabled = value; 68            }    69        } 70        #endregion 71 72        events#region events 73        public event EventHandler Timer 74        { 75            add 76            { 77                Events.AddHandler(EventTimer,value); 78            } 79            remove 80            { 81                Events.RemoveHandler(EventTimer,value); 82            } 83        } 84        #endregion 85 86        event handler functions#region event handler functions 87        protected virtual void OnTimer(EventArgs e) 88        { 89            EventHandler timerHandler = (EventHandler)Events[EventTimer]; 90            if(timerHandler != null) 91            { 92                timerHandler(this,e); 93            } 94        } 95        #endregion 96 97        IPostBackEventHandler 成员#region IPostBackEventHandler 成员 98 99        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument)100        {101            OnTimer(EventArgs.Empty);102        }103104        #endregion105106        utility functions#region utility functions107        private string buildJavaScript()108        {109            StringBuilder sb = new StringBuilder();110            sb.Append("\n<script language=\"javascript\">\n<!--");111            sb.AppendFormat("\n setTimeout(\"{0}\",{1});",new object[]{this.Page.GetPostBackEventReference(this),112                                                                          _interval.ToString()113                                                                      });114            sb.Append("\n//-->\n</script>");115            return sb.ToString();116        }117        #endregion118119        protected override void OnPreRender(EventArgs e)120        {121            base.OnPreRender (e);122            Page.GetPostBackEventReference(this,"");123        }124125126        protected override void Render(HtmlTextWriter writer)127        {128            if(Page != null)129            {130                Page.VerifyRenderingInServerForm(this);131            }132            if(_enabled)133                writer.Write(buildJavaScript());134        }135136137    }138}

转载于:https://www.cnblogs.com/nanshouyong326/archive/2006/12/14/592467.html