C#文件打包下载

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

private void Download(IEnumerable<string> files, string zipFileName)
        {
            //根据所选文件打包下载
            MemoryStream ms = new MemoryStream();
            byte[] buffer = null;

            using (ZipFile file = ZipFile.Create(ms))
            {
                file.BeginUpdate();
                file.NameTransform = new MyNameTransfom();//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。

                foreach (var item in files)
                {
                    file.Add(item);
                }

                file.CommitUpdate();

                buffer = new byte[ms.Length];
                ms.Position = 0;
                ms.Read(buffer, 0, buffer.Length);
            }

            Response.AddHeader("content-disposition", "attachment;filename=" + zipFileName);
            Response.BinaryWrite(buffer);
            Response.Flush();
            Response.End();
        }

public class MyNameTransfom : ICSharpCode.SharpZipLib.Core.INameTransform
    {

        #region INameTransform 成员

        public string TransformDirectory(string name)
        {
            return null;
        }

        public string TransformFile(string name)
        {
            return Path.GetFileName(name);
        }

        #endregion
    }