拥有网页版小U盘 ASP.NET实现文件上传与下载功能_实用技巧_

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class _Default : System.Web.UI.Page {   protected void Page_Load(object sender, EventArgs e)   {   }   //a method for currying file updown   private void UpFile()   {     String strFileName;     //get the path of the file     String FilePath = Server.MapPath("./") + "File";     //judge weather has file to upload     if (FileUpload1.PostedFile.FileName != null)     {       strFileName = FileUpload1.PostedFile.FileName;       //save all the message of the file       strFileName = strFileName.Substring(strFileName.LastIndexOf("\\") + 1);       try       {         FileUpload1.SaveAs(FilePath + "\\" + this.FileUpload1.FileName);         //save the file and obey the rules         Label1.Text = "Upload success!";       }       catch (Exception e)       {         Label1.Text = "Upload Failed!"+e.Message.ToString();       }     }   }   protected void ImageButton_Up_Click(object sender, ImageClickEventArgs e)   {     UpFile();   }   protected void ImageButton_Down_Click(object sender, ImageClickEventArgs e)   {     Response.Redirect("DownFile.aspx");   } }

if (filepathinfo.Exists) { //save the file to local Response.Clear(); Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(filepathinfo.Name)); Response.AddHeader("Content-length", filepathinfo.Length.ToString()); Response.ContentType = "application/octet-stream"; Response.Filter.Close(); Response.WriteFile(filepathinfo.FullName); Response.End(); } 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DownFile.aspx.cs" Inherits="DownFile" %>

 using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; public partial class DownFile : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack)//the first time to load { //get all the file in File folder String[] AllTxt = Directory.GetFiles(Server.MapPath("File")); foreach (String name in AllTxt) { ListBox1.Items.Add(Path.GetFileName(name)); } } } protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e) { //make use of sssion to save the selected file in the listbox with the key of "select" Session["select"] = ListBox1.SelectedValue.ToString(); } protected void ImageButton_Down_Click(object sender, ImageClickEventArgs e) { //judge weather user choose at least one file if (ListBox1.SelectedValue != "") { //get the path of the choosed file String FilePath = Server.MapPath("File/") + Session["select"].ToString(); //initial the object of Class FileInfo and make it as the package path FileInfo filepathinfo = new FileInfo(FilePath); //judge weather the file exists if (filepathinfo.Exists) { //save the file to local Response.Clear(); Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(filepathinfo.Name)); Response.AddHeader("Content-length", filepathinfo.Length.ToString()); Response.ContentType = "application/octet-stream"; Response.Filter.Close(); Response.WriteFile(filepathinfo.FullName); Response.End(); } else { Page.RegisterStartupScript("sb", ""); } } } protected void ImageButton_Up_Click(object sender, ImageClickEventArgs e) { Response.Redirect("Default.aspx"); } }