C# 下载文件

1.0下载文件

   public void DownLoadeFile(string filePath, string name)
        {
            try
            {
                filePath = Server.MapPath(filePath);
                if (System.IO.File.Exists(filePath))
                {
                    FileInfo info = new FileInfo(filePath);
                    long fileSize = info.Length;
                    Response.Clear();
                    Response.ContentType = "application/octet-stream";
                    Response.AddHeader("Content-Disposition", "attachement;filename=" + name);
                    //指定文件大小   
                    Response.AddHeader("Content-Length", fileSize.ToString());
                    Response.WriteFile(filePath, 0, fileSize);
                    Response.Flush();
                }
            }
            catch
            { }
            finally
            {
                Response.Close();
            }
        }

2.0 打压缩包下载

/// <summary>
        /// 文件打包下载
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnDownLoad_Click(object sender, EventArgs e)
        {

            DataTable dt = SelectA132(domainOrderId);
            List<string> filesPathList = new List<string>();
            if (dt != null && dt.Rows.Count > 0)
            {
                if (dt.Rows[0]["EnterpriseState"].ToString() == "1")//企业状态1代表单位0代表个人
                {
                    filesPathList.Add(dt.Rows[0]["EnterpriseImgURL"].ToString());
                }
                filesPathList.Add(dt.Rows[0]["PersonalImgURL"].ToString());
                if (filesPathList != null && filesPathList.Count > 0)
                {
                    zip zip = new zip();
                    zip.DwonloadZip(filesPathList, dt.Rows[0]["domain"].ToString() + ".zip");

                }
            }

        }

  /// <summary>
    /// 压缩文件类
    /// </summary>
    public class zip
    {
        /// <summary>
        /// 所有文件缓存
        /// </summary>
        List<string> filesPathList = new List<string>();
        /// <summary>
        /// 所有空目录缓存
        /// </summary>
        List<string> emptyPathList = new List<string>();
        /// <summary>
        /// 多文件打包下载
        /// </summary>
        /// <param name="filesPathList"></param>
        /// <param name="zipName"></param>
        public void DwonloadZip(List<string> filesPathList, string zipName)
        {
            MemoryStream ms = new MemoryStream();//存储区内存流
            byte[] buffer = null;
            var context = HttpContext.Current;
            using (ZipFile zfile = ZipFile.Create(ms))
            {
                zfile.BeginUpdate();
                /*通过这个名称格式化器，可以将里面的文件名进行一些处理。
                默认情况下，会自动根据文件的路径在zip中创建有关的文件夹。*/
                zfile.NameTransform = new MyNameTransform();
                foreach (var it in filesPathList)
                {
                    if (!string.IsNullOrEmpty(it))
                    {
                        zfile.Add(it);
                    }
                }
                zfile.CommitUpdate();
                buffer = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(buffer, 0, buffer.Length);
            }
            context.Response.AddHeader("content-disposition", "attachment;filename=" + zipName);
            context.Response.BinaryWrite(buffer);
            context.Response.Flush();
            context.Response.End();
        }



    }