C# HtmlTextWriter.Dispose方法代码示例

 public void Compression(System.Web.UI.HtmlTextWriter writer)
 {
     StringWriter sr = new StringWriter();
     HtmlTextWriter tw = new HtmlTextWriter(sr);
     base.Render(tw);
     tw.Flush();
     tw.Dispose();
     StringBuilder sb = new StringBuilder(sr.ToString());
     string outhtml = Regex.Replace(sb.ToString(), "\\r+\\n+\\s+", string.Empty);
     writer.Write(outhtml);
     sr.Dispose();
 }

        protected void Page_Load(object sender, EventArgs e)
        {
            StringBuilder renderedOutput = null;
            StringWriter strWriter = null;
            HtmlTextWriter tWriter = null;

            try
            {
                renderedOutput = new StringBuilder();
                strWriter = new StringWriter( renderedOutput );
                tWriter = new HtmlTextWriter( strWriter );

                view.RenderControl( tWriter );

                tWriter.Flush();
                strWriter.Flush();

                Response.Write( renderedOutput.ToString() );
                Response.Flush();
            }
            catch( Exception ex )
            {
                SendJson( new Framework.API.ReturnObject {
                    Error = true,
                    Message = "There was an error loading the requested page.",
                    Result = new {
                        Message = ex.Message,
                        Type = ex.GetType().FullName,
                        StackTrace = ex.StackTrace
                    }
                } );
            }
            finally
            {
                if( tWriter != null )
                {
                    tWriter.Close();
                    tWriter.Dispose();
                    tWriter = null;
                }

                if( strWriter != null )
                {
                    strWriter.Close();
                    strWriter.Dispose();
                    strWriter = null;
                }
            }

            Response.End();
        }

 public static String getHTML(WebControl aControl)
 {
     StringWriter sr = new StringWriter();
       HtmlTextWriter writer = new HtmlTextWriter(sr);
       aControl.RenderControl(writer);
       writer.Dispose();
       return sr.ToString();
 }

        /// <summary>
        ///     导出GridView中的数据到Excel
        /// </summary>
        /// <param name="gvw"></param>
        /// <param name="title"></param>
        /// <param name="TableName"></param>
        private static void ExportToExcel(GridView gvw, string title, string TableName) {
            //int coun = ExistsRegedit();
            //string fileName = string.Format("DataInfo{0:yyyy-MM-dd_HH_mm}.xls", DateTime.Now);
            //if (coun >0)
            //{
            //    fileName = string.Format("DataInfo{0:yyyy-MM-dd_HH_mm}.xls", DateTime.Now);
            //    //HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF7;
            //}
            //else
            //{
            //    HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
            //    //Page.RegisterStartupScript("mess", "<script>alert('该机器没有安装任何office软件');</script>");
            //    //return;
            //}

            for (var i = 0; i < gvw.Rows.Count; i++) {
                for (var j = 0; j < gvw.HeaderRow.Cells.Count; j++) {
                    //这里给指定的列编辑格式，将数字输出为文本，防止数字溢出  
                    gvw.Rows[i].Cells[j].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
                    //nowrap="nowrap" 不换行
                    gvw.Rows[i].Cells[j].Attributes.Add("nowrap", "nowrap");
                }
            }
            HttpContext.Current.Response.Buffer = true;
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ClearHeaders();
            //fileName = string.Format("DataInfo{0:yyyy-MM-dd_HH_mm}.xls", DateTime.Now);
            HttpContext.Current.Response.AppendHeader("Content-Disposition",
                "attachment;filename=" + HttpUtility.UrlEncode(TableName) + HttpUtility.UrlEncode(title) + ".xls");
            HttpContext.Current.Response.Charset = "UTF-8";
            HttpContext.Current.Response.ContentEncoding = Encoding.GetEncoding("GB2312");


            HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
            var tw = new StringWriter();

            var hw = new HtmlTextWriter(tw);

            gvw.RenderControl(hw);
            if (!string.IsNullOrEmpty(title)) {
                HttpContext.Current.Response.Write("<b><center><font size=3 face=Verdana color=#0000FF>" + title +
                                                   "</font></center></b>");
            }
            HttpContext.Current.Response.Write(tw.ToString());
            HttpContext.Current.Response.Flush();
            //HttpContext.Current.Response.Close();
            HttpContext.Current.Response.End();
            gvw.Dispose();
            tw.Dispose();
            hw.Dispose();
        }

        // -----------------------------------------------------------------------------------------------
        protected override void Render(HtmlTextWriter writer)
        {
            System.IO.MemoryStream mem = new System.IO.MemoryStream();
            System.IO.StreamWriter twr = new System.IO.StreamWriter(mem);
            System.Web.UI.HtmlTextWriter myWriter = new HtmlTextWriter(twr);
            base.Render(myWriter);
            myWriter.Flush();
            myWriter.Dispose();

            // Write our final output string
            writer.Write(AJAXhtmloutput);
        }

        /// <summary>
        /// Executa el Render del GridView para generar el Codigo HTML
        /// </summary>
        /// <param name="grid">Grid</param>
        /// <returns></returns>
        /// <remarks></remarks>
        public static string GetHTMLGridView(GridView grid)
        {
            StringBuilder sb = new StringBuilder();
            StringWriter textwriter = new StringWriter(sb);
            HtmlTextWriter htmlwriter = new HtmlTextWriter(textwriter);
            grid.RenderControl(htmlwriter);
            htmlwriter.Flush();
            textwriter.Flush();
            htmlwriter.Dispose();
            textwriter.Dispose();

            return sb.ToString();
        }