C#导入、导出功能

   //导出功能
        protected void btnExport(object sender, EventArgs e)
        {
            //用来打开下载窗口
            string fileName = "中心联系方式";
            Response.ContentType = "application/vnd.ms-excel";
            // Response.AddHeader("Content-Type", "application/vnd.ms-excel");

            Response.HeaderEncoding = System.Text.Encoding.GetEncoding("utf-8");

            Response.CacheControl = "no-cache";
            // Response.AddHeader("Cache-Control","no-cache");            

            Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}.xls", System.Web.HttpUtility.UrlEncode(fileName)));
            Response.Clear();
            //1将数据库中的数据读取到list中，
            //2设置workbook的值
            //3写入到memorystream中
            //4以二进制的形式写入到response流中
            IList<ContactInfo> list = ContactBiz.Query(new ContactInfo());
            ExcelToDB excelToDB = new ExcelToDB();
            try
            {
                MemoryStream ms = excelToDB.ExportToExcel(fileName, list);
                Response.BinaryWrite(ms.ToArray()); //ms.GetBuffer();
                Response.End();
            }
            catch (Exception ex)
            {
                Logger.Write("中心联系方式导出失败，原因：" + ex.Message);
                throw ex;
            }


        }

        //导入功能
        protected void Button1_Click(object sender, EventArgs e)
        {
            bool fileOK = false;
            string path = Server.MapPath("~/Temp/");
            if (FileUpload1.HasFile)
            {
                string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
                string[] allowedExtensions = { ".xls" };
                for (int i = 0; i < allowedExtensions.Length; i++)
                {
                    if (fileExtension == allowedExtensions[i])
                    {
                        fileOK = true;
                    }
                }
            }
            if (fileOK)
            {
                try
                {
                    path = path + FileUpload1.FileName;
                    FileUpload1.SaveAs(path);
                    //提示文件上传成功
                    //LabMessage1.Text = "文件上传成功.";
                    //LabMessage2.Text = "<b>原文件路径：</b>" + FileUpload1.PostedFile.FileName + "<br />" +
                    //          "<b>文件大小：</b>" + FileUpload1.PostedFile.ContentLength + "字节<br />" +
                    //          "<b>文件类型：</b>" + FileUpload1.PostedFile.ContentType + "<br />";
                    ExcelToDB excelToDB = new ExcelToDB();
                    IList<ContactInfo> list = excelToDB.ExcelToList(path);
                    IList<string> textList = new List<string>();
                    for (int i = 0; i < list.Count; i++)
                    {
                        ContactInfo conInfo = new ContactInfo { CenterName = list[i].CenterName };
                        IList<ContactInfo> list1 = ContactBiz.Query(conInfo);
                        if (list1.Count == 0)
                        {
                            ContactBiz.Insert(list[i]);
                        }
                        else
                        {
                            textList.Add(list[i].CenterName);//add(list[i].CenterName);
                        }
                    }
                    string text = "";
                    if (textList.Count > 0)
                    {
                        for (int i = 0; i < textList.Count; i++)
                        {
                            text += textList[i];
                            if (textList.Count > 1 && i < textList.Count - 1)
                            {
                                text += ",";
                            }
                        }
                        Response.Write("<Script language='JavaScript'>alert('导入失败的中心名称：" + text + "');</Script>");
                    }
                    else
                    {
                        Response.Write("<Script language='JavaScript'>alert('数据全部导入成功');</Script>");
                    }
                }
                catch (Exception ex)
                {
                    Logger.Write("文件上传失败，原因：" + ex.Message);
                    Response.Write("<Script language='JavaScript'>alert('文件上传失败');</Script>");
                }
            }
            else
            {
                Response.Write("<Script language='JavaScript'>alert('只能够上传Excel文件');</Script>");
            }
            //   string filePath = FileUpload1.PostedFile.FileName;//从fileupload控件获取文件的全路径
        }