添加简单的设计时支持-优快云博客

博客展示了MobileBox类的代码，包含命名空间、属性及方法等内容，还涉及TextBox、StringWriter等对象的使用。同时提出代码修改后不正确以及Designer引用是否必须用绝对引用的问题，聚焦于相关代码的实现与疑问。

using System;
using System.IO;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Collections.Specialized;

namespace WCL.MobileBox
{
/// <summary>
/// MobileBox 的摘要说明。
/// </summary>
[DefaultProperty("Text"),
  ToolboxData("<{0}:MobileBox runat=server></{0}:MobileBox>"),
Designer("WCL.MobileBox.MobileBoxDesigner"),
]
public class MobileBox : System.Web.UI.WebControls.WebControl , System.Web.UI.INamingContainer
{
  string text;
  public string Text
  {
   get
   {
   return text;
   }
   set
   {
   text=value;
   }
  }
  protected override void CreateChildControls()
  {
   TextBox m_TextBox1=new TextBox();
   m_TextBox1.Text=text;
   Controls.Add(m_TextBox1);
  }
  protected override void OnPreRender(EventArgs e)
  {
   Controls.Add(new LiteralControl("11111111111111111111111111111111"));
  }

}
public class MobileBoxDesigner:System.Web.UI.Design.ControlDesigner
{
  public override string GetDesignTimeHtml()
  {
   MobileBox m_MobileBox=(MobileBox)Component;

   TextBox m_TextBox=new TextBox();
   StringWriter sw = new StringWriter();
   HtmlTextWriter tw = new HtmlTextWriter(sw);
   m_TextBox.RenderControl(tw);
   return sw.ToString();

}
}
}

一些问题：
   TextBox m_TextBox=new TextBox();
   StringWriter sw = new StringWriter();
   HtmlTextWriter tw = new HtmlTextWriter(sw);
   m_TextBox.RenderControl(tw);
   return sw.ToString();
修改成
   StringWriter sw = new StringWriter();
   HtmlTextWriter tw = new HtmlTextWriter(sw);
   m_MobileBox.RenderControl(tw);
   return sw.ToString();
就不正确了为什么

Designer("WCL.MobileBox.MobileBoxDesigner"), 必须用绝对引用么