asp.net 批量下载实现（打包压缩下载）

1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="MultipleFileDownLoadSample._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Button ID="btDownload" runat="server" Text="下载" onclick="btDownload_Click" 
            style="height: 26px" />
    <hr />
    
        <asp:GridView ID="gv" runat="server" AutoGenerateColumns="false">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:CheckBox ID="chk" runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="文件名">
                    <ItemTemplate>
                        <asp:Label ID="file" runat="server" Text='<%# Eval("FileName") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
    </div>
    </form>
</body>
</html>

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2.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;

namespace MultipleFileDownLoadSample
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack) {
                DataBind();
            }
        }
        public override void DataBind()
        {
            //读取images目录下面的文件列表，绑定到GridView上面
            var query = from item in Directory.GetFiles(Server.MapPath("~/images"))
                        select new
                        {
                            FileName = Path.GetFileName(item)
                        };

            gv.DataSource = query;
            gv.DataBind();
        }


        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(Server.MapPath(string.Format("~/images/{0}",item)));
                }

                try
                {
                    file.CommitUpdate();
                }
                catch(Exception ex)
                {
                    throw new Exception(ex.Message);
                }
               

                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();
        }

        protected void btDownload_Click(object sender, EventArgs e)
        {
            //var urls1 = "upload/file/82cbf858-92d9-4a82-95f7-7c9ba75004c7.jpg;upload/file/0df0dd6c-7d10-43ac-b583-e0a67eea9ba0.jpg;upload/file/d83d903f-4850-4607-a65d-4ac1a96d3791.jpg;upload/file/f0b23b86-4461-4ebd-8afe-eced6784a8dc.jpg;upload/file/c4062bd1-56cd-4801-b5f1-aa29f7b0cd44.jpg;upload/file/eb5bd59d-adee-4ac0-8ae7-706a9d8df0fc.pdf;upload/file/46ef5099-9480-4c47-9a09-8e585a7d97ff.txt;upload/file/7a20cd9e-c0a4-4fd6-9998-40d4d6d835fb.txt;upload/file/37842f30-aa10-4433-a641-55010c8a0efc.doc;upload/file/e8575946-9f09-4aed-b9dd-a4f0d3f617e0.png;upload/file/745f8304-8175-4e6c-9200-f5c3c95dcbd8.doc;upload/file/9372ba27-c05b-4873-91a0-3d3e5ffff9b6.xls;upload/file/160f5052-86e7-400e-aa13-7427af409f3d.txt;upload/file/8fcd56ee-e06b-46b4-b100-52f4349688b1.txt;upload/file/f11e433e-fad7-4b61-8a0e-a5bd7650ce4c.txt;upload/file/4410e83d-cc6f-4d24-91af-a117979f6bc0.jpg;upload/file/3bf0b545-38c0-4e24-a8a6-25dc5ea97eea.jpg;upload/file/22e3ea67-fcad-4d58-b39e-048661608ae8.jpg;upload/file/cc6162ca-8640-4f26-ad39-71ec1b287eae.txt;upload/file/cfcd3c53-ff84-4a54-bf3c-85dd5b3e8e6d.pdf;upload/file/668404f7-e808-4d3a-8818-d01fbba1f42f.pdf;upload/file/59f8d59d-4d3b-4262-83ab-bd18d5f345e3.pdf;upload/file/9da50650-daff-40b3-b9c9-4067b3f565bd.jpg;upload/file/1a3150a3-eecb-48c1-aabb-e5d4f6847ca4.jpg;upload/file/dfe943ed-6432-424e-a881-70442dc833de.jpg;upload/file/4a2005a1-f68f-4289-979a-b7d936383a7c.jpg;upload/file/9a208b9e-2591-45bd-800a-1d67ef974cce.jpg;upload/file/f00b9046-7f4a-4154-af71-662ff7b5ec3e.jpg;upload/file/57c03a84-02bc-43f9-8f8a-d158ad67c9cf.doc;upload/file/3761e5a4-4238-4234-8ea5-c3d90987ae3c.xls;upload/file/5c8a60f4-ac9e-4b65-9f26-3d7073ff9762.txt;upload/file/add4390c-ed11-40b4-a599-9553a308ee02.txt;upload/file/cb790b7b-2c50-48f6-b82c-eda06c6b2fc4.txt;upload/file/c3ccfef9-4a76-4767-9ad3-e197c2667d0c.txt;upload/file/048066be-081e-4bf8-be24-abca2ee560c0.xls;upload/file/506f7f11-dd40-4838-b1cf-af4382f6b8d6.jpg;upload/file/4201a8b1-96f1-4312-9736-0eb682263b90.jpg;upload/file/be2963b7-66bc-4f5f-bb42-886ec08c11ab.txt;upload/file/4f455ab5-42f8-4a01-b21c-1627aff73706.jpg;";
            //var urls = urls1.TrimEnd(';');
            //根据复选框的选中状态，将多个文件打包下载
            List<string> files = new List<string>();
            //string[] urlstrs = urls.Split(';');
            //foreach (var a in urlstrs)
            //{
            //    files.Add(a);
            //}
            foreach (GridViewRow item in gv.Rows)
            {
                var chk = item.FindControl("chk") as CheckBox;
                if (chk.Checked)
                {
                    var label = item.FindControl("file") as Label;
                    files.Add(label.Text);
                }
            }

            Download(files, "Test.zip");
        }
    }

    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
    }
}

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