用PagePaser创建Page作为HttpHandler

protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write(HttpUtility.HtmlEncode(DumpHtmlFrom("~/Default.aspx")));
    }
    
    //virtualPath: allow queries
    string DumpHtmlFrom(string virtualPath)
    {
        StringWriter writer = new StringWriter();         
        var path = Request.Url.Scheme + "://" + Request.Url.Authority + VirtualPathUtility.ToAbsolute(virtualPath);        
        var parts = virtualPath.Split('?');

        string query = string.Empty;
        if (parts.Length > 1)
            query = parts[1];
        virtualPath = parts[0];

        HttpContext context = new HttpContext(new HttpRequest(virtualPath, path, query), new HttpResponse(writer));
        var handler = PageParser.GetCompiledPageInstance(virtualPath, MapPath(virtualPath), context);
        handler.ProcessRequest(context);

        return writer.ToString();
    }