ASP.NET自定义Web服务器控件之Button控件

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Linq; 
using System.Text; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
 
//自定义web服务器button 
namespace MyControls 
{ 
    [DefaultProperty("Text")] 
    [ToolboxData("<{0}:MyButton runat=server></{0}:MyButton>")] 
    public class MyButton : WebControl,IPostBackEventHandler 
    { 
        [Bindable(true)] 
        [Category("Appearance")] 
        [DefaultValue("")] 
        [Localizable(true)] 
        public string Text 
        { 
            get 
            { 
                String s = (String)ViewState["Text"]; 
                return ((s == null) ? String.Empty : s); 
            } 
 
            set 
            { 
                ViewState["Text"] = value; 
            } 
        } 
 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]//生成属性时，按属性内部内容生成(例如在此控件里面(Size-Height,Size_Width)) 
        //[PersistenceMode(PersistenceMode.InnerProperty)]//以子标签的形式显示(例如<Size Width="" Height=""/>) 
        public Size Size 
        { 
            get 
            { 
                if (ViewState["Size"] == null) { 
                    ViewState["Size"] = new Size(); 
                } 
                return (Size)ViewState["Size"]; 
            } 
 
            set 
            { 
                ViewState["Size"] = value; 
            } 
        } 
        //定义控件的标签形式 
        protected override HtmlTextWriterTag TagKey 
        { 
            get 
            { 
                return HtmlTextWriterTag.Input; 
            } 
        } 
 
        //初始化 
        protected override void OnInit(EventArgs e) 
        { 
            this.Style.Add("width", Size.Width + "px"); 
            this.Style.Add("height", Size.Height + "px"); 
            this.Attributes.Add("type", "submit"); //提交按钮 
            this.Attributes.Add("value",Text); 
            this.Attributes.Add("name",this.UniqueID);//回发事件必须有的一个属性 
            base.OnInit(e); 
        } 
        //打印当前控件的内容 
        protected override void RenderContents(HtmlTextWriter output) 
        { 
            //output.Write(Text); 
        } 
         
        public delegate void ClickHandle(); 
        private object key=new object(); 
        public event ClickHandle Click { 
            add { 
                this.Events.AddHandler(key,value); 
            } 
            remove { 
                this.Events.RemoveHandler(key, value); 
            } 
        } 
        //按钮的回发事件 
        public void RaisePostBackEvent(string eventArgument) 
        { 
            ClickHandle handle = (ClickHandle)base.Events[key]; 
            if (handle != null) { 
                handle(); 
            } 
        } 
    } 
}