using System.IO;using ICSharpCode.SharpZipLib.Zip;using ICSharpCode.SharpZipLib.Checksums;using ICSharpCode.SharpZipLib.GZip;    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)    {        DataTable dt1 = OleDbHelper.GetDataTable("select tupian from cp_img where cpid=" + ltl_id.Text + " and lx=0 order by px asc");        DataTable dt2 = OleDbHelper.GetDataTable("select tupian from cp_img where cpid=" + ltl_id.Text + " and lx=1 order by px asc");        if (dt1.Rows.Count > 0)        {            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。                for (int i = 0; i < dt1.Rows.Count; i++)                {                    file.Add(Server.MapPath(dt1.Rows[i]["tupian"].ToString()));                    for (int j = 0; j < dt2.Rows.Count; j++)                    {                        file.Add(Server.MapPath(dt2.Rows[j]["tupian"].ToString()));                    }                }                file.CommitUpdate();                buffer = new byte[ms.Length];                ms.Position = 0;                ms.Read(buffer, 0, buffer.Length);            }            string filename = ltl_mc.Text + "-" + DateTime.Now.ToString() + ".zip";            Response.AddHeader("content-disposition", "attachment;filename=" + filename + "");            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    }