asp.net网站下载功能页面代码

//cs文件 

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

public partial class DownLoad : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string fileName = Request.QueryString["FileName"];
            if (fileName != "")
            {
                //获取文件路径
                string path = Server.MapPath("Upload/") + fileName;
                //初始化 FileInfo 类的实例，它作为文件路径的包装
                FileInfo fi = new FileInfo(path);

                //判断文件是否存在
                if (fi.Exists)
                {
                    //将文件保存到本机上
                    Response.Clear();
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(fi.Name));
                    Response.AddHeader("Content-Length", fi.Length.ToString());
                    Response.ContentType = "application/octet-stream";
                    Response.Filter.Close();
                    Response.WriteFile(fi.FullName);
                    Response.End();
                }
            }
            else
            {
                Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script>alert('找不到所要下载的文件！');{location.href='Default.aspx'}</script>");
            }
        }
    }
}

//aspx页面中

<asp:DataList ID="dlCharge" runat="server" Width="543px" >
                                <ItemTemplate>
                                    <table align="center" cellpadding="0" cellspacing="0" width="543">
                                        <tr>
                                            <td>
                                                <span class="hongcu">『<%# DataBinder.Eval(Container.DataItem,"Title") %>』</span><span class="chengse"><%# DataBinder.Eval(Container.DataItem,"Title") %></span>
                                                <span class="huise1">
                                                    <%#DataBinder.Eval(Container.DataItem,"date") %>
                                                </span>
                                                <br />
                                                <span class="shenlan">
                                                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="DownLoad.aspx?FileName=<%#DataBinder.Eval(Container.DataItem,"FileName") %> "><%#DataBinder.Eval(Container.DataItem,"FileName") %></a>
                                                </span>
                                                <br />
                                               </td>
                                        </tr>
                                        <tr style="color: #000000">
                                            <td align="center">
                                                <img height="1" src="images/longline.gif" width="525" /></td>
                                        </tr>
                                        <tr style="color: #000000">
                                            <td height="10">
                                            </td>
                                        </tr>
                                    </table>
                                </ItemTemplate>
                            </asp:DataList>