组件开发中常用的属性

DefaultEvent( "ClickNext" ):指定组件的默认事件
DefaultProperty( "NextText" ):指定组件的默认属性
Bindable(true or false):指定属性是否通常用于绑定
Category( "Appearance" ):指定其属性或事件将显示在可视化设计器中的类别
DefaultValue( typeof( Color ) , "" ):指定属性的默认值
Description( "The background color"):指定属性或事件的说明
TypeConverter(typeof( WebColorConverter )):指定用作此特性所绑定到的对象的转换器的类型
Browsable(true or false):指定一个属性或事件是否应显示在“属性”窗口中
DesignerSerializationVisibility( DesignerSerializationVisibility.Hidden ):指定在设计时序列化组件上的属性时所使用的持久性类型

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简单控件 事件




EventManager


using System;


using System.Web.UI;


using System.Web.UI.WebControls;


using System.ComponentModel;






namespace MyControls






{




/**//// <summary>


/// Summary description for MyEventManager.


/// </summary>


[DefaultEvent("NextClick"),DefaultProperty("text")]


public class MyEventManager : System.Web.UI.WebControls.WebControl,IPostBackEventHandler






{





public event EventHandler NextClick;


public event EventHandler PreClick;




[Bindable(true),Category("Behavior"),DefaultValue(""),Description("text ")]


public string text






{


get






{


return ( (string)ViewState["text"] == null )? string.Empty:(string)ViewState["text"] ;


}


set






{


ViewState["text"] = value;


}


}




protected virtual void OnNextClick(EventArgs e)






{


if(NextClick != null)






{


NextClick(this,EventArgs.Empty);


}




}




protected virtual void OnPreClick(EventArgs e)






{


if(PreClick != null)






{


PreClick(this,EventArgs.Empty);


}




}




void IPostBackEventHandler.RaisePostBackEvent(string EventArguments)






{


if( EventArguments =="Pre" )






{


OnPreClick(EventArgs.Empty);


Page.Trace.Warn("Pre Button Click");


}


else






{


OnNextClick(EventArgs.Empty);


Page.Trace.Warn("Next Button Click");


}


}




[Bindable(true),


Category("Appearance"),


DefaultValue("")]








protected override void Render(HtmlTextWriter output)






{


//output.Write(Text);


this.Attributes.AddAttributes(output);




output.AddAttribute(HtmlTextWriterAttribute.Onclick,Page.GetPostBackEventReference(this,"Pre"));


output.AddAttribute("language","javascript");




output.RenderBeginTag(HtmlTextWriterTag.Button);


output.Write("Pre");


output.RenderEndTag();




output.AddAttribute(HtmlTextWriterAttribute.Onclick,Page.GetPostBackEventReference(this,"Next"));


output.AddAttribute("language","javascript");




output.RenderBeginTag(HtmlTextWriterTag.Button);


output.Write("Next");


output.RenderEndTag();






base.Render(output);


}


}


}