有个需求就是，附件中的文件（比如 txt\excel\jpg…）一个个下载有些麻烦，想实现打包下载功能，比如网易邮箱的打包下载，于是就有了此文。

借助外力

引入ICSharpCode.SharpZipLib.dll

引入命名空间

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using ICSharpCode.SharpZipLib.Zip;
using System.IO;

核心代码

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namespace NoneLibrary
{
    public class BatchDownload
    {
        ///批量下载
        ///参数string[]数组，需要传物理路径
        ///返回值byte[]数组
        public byte[] Download(string[] path)
        {
            byte[] buffer = null;
            using(MemoryStream ms = new MemoryStream())
            {
                using(ZipFile zip = ZipFile.Create(ms))
                {

                    zip.BeginUpdate();
                    zip.NameTranform = new MyNameTranform(); //使用自定义MyNameTranform类，改变打包路径

                    if(path.Length == 0)
                        throw new Exception("参数path路径为空!!");

                    //遍历path放入zip中
                    foreach(var p in path)
                    {
                        zip.Add(p);
                    }
                    zip.CommitUpdate();

                    buffer = new byte[ms.Length];
                    ms.Posotion = 0;
                    ms.Read(buffer, 0, buffer.Length);  //读入buffer

                }


            }

            return buffer;


        }

    }
    ///修改打包路径，仅需要文件名和扩展名即可
    public class MyNameTranform : ICSharpCode.SharpZipLib.Core.INameTransform
    {
        public string TransformDirectory(string name)
        {
            return null;
        }
        ///返回文件名和扩展名
        public string TransformFile(string name)
        {
            return Path.GetFileName(name);
        }
    }

}

输出

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Response.Clear();
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AddHeader("Content-Disposition", "attachment; filename=" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".zip");
Response.BinaryWrite(buffer);  //输出
Response.Flush();
Response.End();