如何实现多文件下载（实例）
转自：http://www.cnblogs.com/chenxizhang/archive/2010/03/17/1687989.html
有网友看了我之前喜写的多文件下载的文章，想自己实现一个类似的。但遇到困难。我这里准备了一个可以参考的完整的例子。其实不难，我希望这位朋友还是要把基础功夫学好。
1. 页面
<%@ 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>
2. 代码
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))); } 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(); } protected void btDownload_Click(object sender, EventArgs e) { //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>(); 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 } }
