Asp.net 获取图片列表并打包下载

先引用：ICSharpCode.SharpZipLib.dll

后台代码：

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

    }