Asp.net 获取图片列表并打包下载

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
}