动态的呈现页面. 模拟ASP.NET UpdatePanel部分更新配合WebServices.

在平常工作中，我们经常遇到需要将页面GridView导出到EXCEL, 通常做法我们就是动态构建以个Page及Form，然后写到返回流(Response)中.

using  System;
using  System.Web;
using  System.Web.UI;
using  System.IO;
using  System.Reflection;
using  System.Web.UI.HtmlControls;

public   class  ViewManager
{
     public   static   string  RenderView( string  path)
    {
         return  RenderView(path,  null );
    }

     public   static   string  RenderView( string  path,  object  data)
    {
        Page pageHolder  =   new  Page();
        UserControl viewControl  =  (UserControl) pageHolder.LoadControl(path);
        HtmlForm hf  =   new  HtmlForm();
        hf.Attributes.Add( " runat " ,  " server " );
       
         if  (data  !=   null )
        {
            Type viewControlType  =  viewControl.GetType();            
            FieldInfo field  =  viewControlType.GetField( " Data " );

             if  (field  !=   null )
            {
                field.SetValue(viewControl, data);
            }
             else
            {
                 throw   new  Exception( " View file:  "   +  path  +   "  does not have a public Data property " );
            }
        }
        hf.Controls.Add(viewControl);
        pageHolder.Controls.Add(hf);

        StringWriter output  =   new  StringWriter();
        HttpContext.Current.Server.Execute(pageHolder, output,  false );

         return  output.ToString();
    }
}

//

protected   void  Button1_Click( object  sender, EventArgs e)
    {
        List < string >  obj  =   new  List < string > ();
         for  ( int  i  =   0 ; i  <   10 ; i ++ )
            obj.Add(i.ToString());
         string  str  =  ViewManager.RenderView( " UserControls/User.ascx " , obj);
        Response.Write(str);
    }

More: http://blog.joycode.com/scottgu/archive/2006/10.aspx