ASP.NET自定义控件开发设计界面（设计时界面与运行时界面不同）

设计类:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
namespace ServerControl2
{
  public   class Des:System.Web.UI.Design.ControlDesigner
    {
      public override string GetDesignTimeHtml()
      {
          StringWriter sw = new StringWriter();
          HtmlTextWriter tw = new HtmlTextWriter(sw);
          HyperLink hl = new HyperLink();
          hl.Text = "Hello, Control";
          hl.NavigateUrl = "http://www.microsoft.com/china/msdn";
          hl.RenderControl(tw);
          tw.Write(HtmlTextWriter.SpaceChar);
          Label lbl = new Label();
          lbl.BackColor = System.Drawing.Color.LemonChiffon;
          lbl.Text = hl.NavigateUrl;
          lbl.RenderControl(tw);
          return sw.ToString();
      }
    }
}

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;

namespace ServerControl2
{
    
    [Designer("ServerControl2.Des,ServerControl2"),DefaultProperty("Text")]
    [ToolboxData("<{0}:ServerControl1 runat=server></{0}:ServerControl1>")]
    public class ServerControl1 : WebControl,IPostBackEventHandler
    {
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string Text
        {
            get
            {
                String s = (String)ViewState["Text"];
                return "自定义控件aa";
            }
            set
            {
                ViewState["Text"] = value;
            }
        }
        public int Speed
        {
            get;
            set;
        }
 
        protected override void RenderContents(HtmlTextWriter output)
        {
            output.Write(Text);
            output.Write(string.Format(@" <marquee width=400 scrollamount='{0}' behavior=alternate direction=left align=middle>弹来弹去跑马灯!</marquee>",Speed));
           
        }
        protected override void OnPreRender(EventArgs e)
        {

        }
        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Onclick,"Javascript:"+Page.GetPostBackEventReference(this));
            writer.AddStyleAttribute(HtmlTextWriterStyle.BackgroundColor, "red");
            base.AddAttributesToRender(writer);
        }
        public event EventHandler click;
        public void RaisePostBackEvent(string eventArgument)
        {
            Onclick(EventArgs.Empty);
        }
      protected virtual void Onclick(EventArgs ex)
      {
          if (click!=null)
    {
         click(this,ex);
    }
       //  HttpContext.Current.Response.Redirect("http://www.baidu.com");

      }
    }
}