实现了IPostBackEventHandler接口的TextBox

    using System;


using System.Web.UI;


using System.Web.UI.WebControls;


using System.ComponentModel;




namespace PEONormalControl




...{




    /**//// <summary>


    /// 回传事件参数类型


    /// </summary>   


    public class EventTextBoxEventArgs:EventArgs




    ...{


        private string _ToAppend;


        EventTextBoxEventArgs()




        ...{           


           


        }       


        public EventTextBoxEventArgs(String ArgText)




        ...{


            this._ToAppend=ArgText;           


        }




        /**//// <summary>


        /// 回传事件参数


        /// </summary>


        public String ArgText




        ...{




            get...{return _ToAppend;}




            set...{_ToAppend =value;}


        }


    }




    /**//// <summary>


    /// 从TextBox继承，实现了IPostBackEventHandler接口


    /// </summary>


    [DefaultProperty("Text"),


    ToolboxData("<{0}:EventTextBox runat=server></{0}:EventTextBox>")]


    public class EventTextBox : System.Web.UI.WebControls.TextBox,IPostBackEventHandler




    ...{


        //private string text;


        private static readonly object objEventChangedKey;


        public delegate void EventChangedHandler(object sender,EventTextBoxEventArgs e);




        [Bindable(false),


            Category("Appearance"),


            DefaultValue("")]


        public string PrefixText




        ...{


            get




            ...{    if    (ViewState["PrefixText"] == null)


                    return "";


                else


                return ViewState["PrefixText"].ToString() ;


            }




            set




            ...{


                ViewState["PrefixText"] = value;


            }


        }       




        /**//// <summary>


        /// 引起回传的事件名称


        /// </summary>


        [Bindable(false),


            Category("Behavior"),


            DefaultValue(""),Description("引起回传的事件名称")]           


        public string EventName




        ...
13acd
{


            get




            ...{    if    (ViewState["EventName"] == null)


                    return "";


                else


                return ViewState["EventName"].ToString() ;


            }




            set




            ...{


                ViewState["EventName"] = value;


            }


        }




        /**//// <summary>


        /// 回传事件参数


        /// </summary>


        [Bindable(false),


            Category("Behavior"),


            DefaultValue(""),Description("回传事件参数")]


        public string EventArgText




        ...{


            get




            ...{    if    (ViewState["EventArgText"] == null)


                    return "";


                else


                return ViewState["EventArgText"].ToString() ;


            }




            set




            ...{


                ViewState["EventArgText"] = value;


            }


        }




        /**//// <summary>


        /// 用户自定义的回传函数


        /// </summary>


        [Bindable(false),


            Category("Behavior"),


            DefaultValue(""),Description("用户自定义的回传函数，为空则使用标准的回传函数")]


        public String UserPostBackFunction




        ...{


            get




            ...{    if    (ViewState["UserPostBackFunction"] == null)


                    return "";


                else


                return ViewState["UserPostBackFunction"].ToString() ;


            }




            set




            ...{


                ViewState["UserPostBackFunction"] = value;


            }


        }


        protected virtual void OnEventChanged(EventTextBoxEventArgs e)




        ...{


            EventChangedHandler handler1 = (EventChangedHandler) base.Events[objEventChangedKey];


            if (handler1 != null)




            ...{


                handler1(this, e);       


            }


        }


        public void RemoveStateView(String strKey)




        ...{


            this.ViewState.Remove(strKey);


        }


        [Description("EventTextBox_OnEventChanged"), Category("Action")]


        public event EventChangedHandler EventChanged




        ...{


            add




            ...{


                base.Events.AddHandler(objEventChangedKey, value);


            }


            remove




            ...{


                base.Events.RemoveHandler(objEventChangedKey, value);


            }


        }       


       




        /**//// <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)




        ...{


            EventChangedHandler handler1 = (EventChangedHandler) base.Events[objEventChangedKey];


            if (handler1 != null && EventName != String.Empty)




            ...{


                base.Attributes[EventName]=UserPostBackFunction==""? Page.GetPostBackClientEvent(this,EventArgText):UserPostBackFunction;


                if(PrefixText != "" && !base.Text.StartsWith(PrefixText)) base.Text = PrefixText + base.Text;


            }


            base.Render(output);


           


        }


        //增加自己想渲染的属性


        protected override void AddAttributesToRender(HtmlTextWriter writer)




        ...{


            //writer.AddAttribute(HtmlTextWriterAttribute.Title,"PEOControl");


           


            base.AddAttributesToRender (writer);


        }




   




        IPostBackEventHandler 成员#region IPostBackEventHandler 成员




        public void RaisePostBackEvent(string eventArgument)




        ...{


            // TODO:  添加RaisePostBackEvent 实现


            EventTextBoxEventArgs e = new EventTextBoxEventArgs(eventArgument);


            OnEventChanged(e);


        }




        #endregion


    }


}