将web页面的GridView导出到excel文件，包括GridView中checkbox，image的处理。

public static void Export(Control control, string defaultFileName)    {        HttpContext.Current.Response.Clear();        HttpContext.Current.Response.BufferOutput = true;        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + defaultFileName);        HttpContext.Current.Response.ContentType = "application/ms-excel";        control.EnableViewState = false;         HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");        System.IO.StringWriter stringWriter = new System.IO.StringWriter();        System.Web.UI.HtmlTextWriter textWriter = new System.Web.UI.HtmlTextWriter(stringWriter);        control.RenderControl(textWriter);        string result = stringWriter.ToString();        result = SpecialHandler(result);        HttpContext.Current.Response.Write(string.Format(ExportToExcelHelper.BasicHTML, result));        HttpContext.Current.Response.End();    }    private static string SpecialHandler(string result)    {        //把checkbox改成文字Yes/No        result = Regex.Replace(result, "
     ", "Received /", RegexOptions.IgnoreCase);        result = Regex.Replace(result, "
     ", "Not received /", RegexOptions.IgnoreCase);        result = result.Replace("  ", "");        //替换掉链接和外围的div        result = Regex.Replace(result, "
     
      ", "", RegexOptions.IgnoreCase);        result = Regex.Replace(result, "
      
       |
      
||
      
       ||\\n", "", RegexOptions.IgnoreCase);        //TODO:处理图片，把图片替换成文字        string replaceText = string.Empty;        Regex re = new Regex("
       ", RegexOptions.None);        //行标题特殊处理        Regex re2 = new Regex("
       
        ", RegexOptions.None);                return result;    }    public static string BasicHTML    {        get        {            return @"                                                    
                                    
                                                                                    {0}                                            ";        }    }