自己做控件小例子

自己做控件，也很容易。贴出来，给初学的人提供经验

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.ComponentModel;

namespace ISDReport.control
{    
    public class DemoLinkButton:System.Web.UI.WebControls.WebControl,IPostBackEventHandler
    {    
        public DemoLinkButton()
        {
        }
    
        [Bindable(false),
        Category("Appearance"), 
        DefaultValue("")] 
        
        public string Text 
        {
            get
            {
                string _text = (string)ViewState["Text"];
                return _text==null?"":_text;
            }
            set
            {
                ViewState["Text"] = value;
            }
        }

        protected override void OnPreRender(System.EventArgs e)
        {
             string scriptClick="<script language='javascript'>function DoOnClick(){"
                 +((HyperLinkClicked==null)?"":(Page.GetPostBackClientEvent(this,"Clicked"))
                 +"; return;}</script>");
            Page.RegisterClientScriptBlock("OnClicked",scriptClick);
        }

        protected override void Render(HtmlTextWriter writer)
        {
            if(this.Text=="")
            {
                writer.Write("<a href=\"javascript:DoOnClick();\" id=\""+this.ClientID+"\">DemoLinkButton</a>");
            }
            else{
                writer.Write("<a href=\"javascript:DoOnClick();\" id=\""+this.ClientID+"\">"+this.Text+"</a>");
            }
        }

        public void RaisePostBackEvent(string eventArgument)
        {
            if(eventArgument=="Clicked")  HyperLinkClicked(this,System.EventArgs.Empty);
        }            


        public delegate void HyperLinkClickedHandle(object sender,System.EventArgs e);
        public event HyperLinkClickedHandle HyperLinkClicked;

    }
}