.net 批量導出文件，以ZIP壓縮方式導出

 1. 首先Nuget          ICSharpCode.SharpZipLib

    <script type="text/javascript">
        $(function () {
            $("#OutPutLink").click(function () {    // 單擊下文件時
                $.ajax({         // 先判斷條件時間內沒有文件
                    url: "/Home/ExistsFile?statTime=" + $("#statTime").val() + "&endTime=" + $("#endTime").val(),
                    type: "Get",
                    success: function (data) {
                        if (data == "Exists") {    // 如果有   就下載
                            window.location.href = "/Home/OutputFile?statTime=" + $("#statTime").val() + "&endTime=" + $("#endTime").val();
                        }
                        else
                            alert("該時間區域內無文件");
                    }
                });
            });
        });
    </script>

/// <summary>
        /// 驗證該時間段是否有文件
        /// </summary>
        /// <param name="statTime">開始時間</param>
        /// <param name="endTime">結束時間</param>
        /// <returns></returns>
        public string ExistsFile(DateTime statTime, DateTime endTime)
        {
            DateTime sTime = DateTime.Parse(statTime.ToString("yyyy-MM-dd") + " 00:00:00");
            DateTime eTime = DateTime.Parse(endTime.ToString("yyyy-MM-dd") + " 23:59:59");
            DirectoryInfo TheFolder = new DirectoryInfo(Server.MapPath("~/Content/ExcelFile"));
            //遍歷文件夾下的文件
            List<string> listFJName = new List<string>();//保存附件名字
            foreach (FileInfo NextFile in TheFolder.GetFiles())
            {
                string fileType = Path.GetExtension(NextFile.FullName).ToString().ToLower();
                if (fileType == ".xls" || fileType == ".xlsx")
                {
                    string fileDate = NextFile.Name.Substring(0, 8);
                    DateTime dtime = DateTime.ParseExact(fileDate, "yyyyMMdd", null);
                    if (dtime >= sTime && dtime <= eTime)
                    {
                        listFJName.Add(NextFile.Name);
                    }
                }
            }
            if (listFJName.Count > 0)
                return "Exists";
            return "NotExists";
        }

        /// <summary>
        /// 執行將文件壓縮下載
        /// </summary>
        /// <param name="statTime"></param>
        /// <param name="endTime"></param>
        public void OutputFile(DateTime statTime,DateTime endTime)
        {
            DateTime sTime = DateTime.Parse(statTime.ToString("yyyy-MM-dd") + " 00:00:00");
            DateTime eTime = DateTime.Parse(endTime.ToString("yyyy-MM-dd") + " 23:59:59");
            DirectoryInfo TheFolder = new DirectoryInfo(Server.MapPath("~/Content/ExcelFile"));
            //遍歷文件夾下的文件
            List<string> listFJ = new List<string>();//保存附件路徑
            List<string> listFJName = new List<string>();//保存附件名字
            foreach (FileInfo NextFile in TheFolder.GetFiles())
            {
                string fileType = Path.GetExtension(NextFile.FullName).ToString().ToLower();
                if (fileType == ".xls" || fileType == ".xlsx")
                {
                    string fileDate = NextFile.Name.Substring(0, 8);
                    DateTime dtime = DateTime.ParseExact(fileDate, "yyyyMMdd", null);
                    if (dtime >= sTime && dtime <= eTime)
                    {
                        listFJ.Add(Server.MapPath("~/Content/ExcelFile/") + NextFile.Name);
                        listFJName.Add(NextFile.Name);
                    }
                }
            }
            if (listFJ.Count > 0 && listFJName.Count > 0)
            {
                string time = DateTime.Now.Ticks.ToString();
                ZipFileMain(listFJ.ToArray(), listFJName.ToArray(), Server.MapPath("~/Content/ExcelFile/" + time + ".zip"), 9);//壓縮文件
                DownloadFile(Server.UrlEncode("附件.zip"), Server.MapPath("~/Content/ExcelFile/" + time + ".zip"));//下載文件
            }
        }
       
        /// <summary>
        /// 下載文件
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="filePath"></param>
        private void DownloadFile(string fileName, string filePath)
        {
            FileInfo fileInfo = new FileInfo(filePath);
            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();
            Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
            Response.AddHeader("Content-Length", fileInfo.Length.ToString());
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.ContentType = "application/octet-stream";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
            Response.WriteFile(fileInfo.FullName);
            Response.Flush();
            System.IO.File.Delete(filePath);//刪除已下載文件
            Response.End();
        }

        /// <summary>
        /// 壓縮文件
        /// </summary>
        /// <param name="fileName">要壓縮的所有文件（完全路徑)</param>
        /// <param name="fileName">文件名稱</param>
        /// <param name="name">壓縮後文件路徑</param>
        /// <param name="Level">壓縮級別</param>
        public void ZipFileMain(string[] filenames, string[] fileName, string name, int Level)
        {
            ZipOutputStream s = new ZipOutputStream(System.IO.File.Create(name));
            Crc32 crc = new Crc32();
            //壓縮級別
            s.SetLevel(Level); // 0 - store only to 9 - means best compression
            try
            {
                int m = 0;
                foreach (string file in filenames)
                {
                    //打開壓縮文件
                    FileStream fs = System.IO.File.OpenRead(file);//文件地址
                    byte[] buffer = new byte[fs.Length];
                    fs.Read(buffer, 0, buffer.Length);
                    //建立壓縮實體
                    ZipEntry entry = new ZipEntry(fileName[m].ToString());//原文件名
                                                                          //時間
                    entry.DateTime = DateTime.Now;
                    //空間大小
                    entry.Size = fs.Length;
                    fs.Close();
                    crc.Reset();
                    crc.Update(buffer);
                    entry.Crc = crc.Value;
                    s.PutNextEntry(entry);
                    s.Write(buffer, 0, buffer.Length);
                    m++;
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                s.Finish();
                s.Close();
            }
        }