自定义复合控件[5]获取包含的文本

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

namespace  csMathControl
{
     ///   <summary>
     ///  Center 的摘要说明。
     ///   </summary>
    [DefaultProperty( " Text " ), 
        ToolboxData( " <{0}:Center runat=server></{0}:Center> " )]
    [ParseChildren( false )]
     public   class  Center : System.Web.UI.WebControls.WebControl,INamingContainer
    {
         private   string  text;
    
        [Bindable( true ), 
            Category( " Appearance " ), 
            DefaultValue( "" )] 
         public   string  Text 
        {
             get
            {
                 return  text;
            }

             set
            {
                text  =  value;
            }
        }

         ///   <summary>  
         ///  将此控件呈现给指定的输出参数。
         ///   </summary>
         ///   <param name="output">  要写出到的 HTML 编写器  </param>
         protected   override   void  Render(HtmlTextWriter output)
        {
             // output.Write(Text);
            output.AddAttribute( " align " , " center " );
            output.AddStyleAttribute( " BackGround-color " , " red " );
             // pannel开始
            output.RenderBeginTag( " div " );
             foreach (Control ctrItem  in  Controls)
            {
                ctrItem.RenderControl(output);
            }
            output.RenderEndTag();
        }
        }
}