C#导出文件函数

 /// <summary>
        /// 导出文件类型
        /// </summary>
        public enum FileType
        {
            /// <summary>
            /// Excel文档
            /// </summary>
            Excel,
            /// <summary>
            /// Html文件
            /// </summary>
            Html,
            /// <summary>
            /// Word文档
            /// </summary>
            Word
        }
        /// <summary>
        /// 文件到处函数
        /// </summary>
        /// <param name="controlName">需要导出成为文件服务器控件</param>
        /// <param name="fileType">文件类型</param>
        /// <param name="page">页面</param>
        public void ExportFile(System.Web.UI.Control controlName, FileType fileType, Page page)
        {
            page.Response.Clear();
            page.Response.Buffer = true;

            #region 处理输出类型
            switch (fileType)
            {
                case FileType.Excel:
                    page.Response.Charset = "GB2312";
                    page.Response.AppendHeader("Content-Disposition", "attachment;filename=ExportFile.xls");
                    page.Response.ContentType = "application/ms-excel";
                    break;
                case FileType.Html:
                    page.Response.Charset = "GB2312";
                    page.Response.AppendHeader("Content-Disposition", "attachment;filename=ExportFile.html");
                    page.Response.ContentType = "application/ms-html";
                    break;
                case FileType.Word:
                    page.Response.Charset = "GB2312";
                    page.Response.AppendHeader("Content-Disposition", "attachment;filename=ExportFile.doc");
                   
                    page.Response.ContentType = "application/ms-word";
                    break;
                default:
                    page.Response.Charset = "GB2312";
                    page.Response.AppendHeader("Content-Disposition", "attachment;filename=ExportFile.xls");
                    page.Response.ContentType = "application/ms-excel";
                    break;
            }
            #endregion
            page.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");    //设置输出流为简体中文
            //this.EnableViewState = false;
            //System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
            controlName.RenderControl(oHtmlTextWriter);          
            page.Response.Write(oStringWriter.ToString());
            page.Response.End();
        }