利用asp.net进行文件上传和下载时非常常用的功能,现做整理,将源码上传,提供给初学者参考,以下代码中的样式文件就不上传了,下载者请将样式去掉。
效果图如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileUploadManager.aspx.cs"
Inherits="NewsManagement_FileUploadManager" %>
<!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>文件上传管理</title>
<link href="../themes/common.css" rel="stylesheet" type="text/css" />
<link href="../themes/reset.css" rel="stylesheet" type="text/css" />
<link href="../themes/modules.css" rel="stylesheet" type="text/css" />
<link href="../themes/fix.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div class="right">
<table cellpadding="1" cellspacing="1" class="tablesingle" width="100%" style=" height:500px;">
<tr>
<td colspan="3">
<asp:Label ID="lab_FolderInfo" runat="server" Font-Size="Medium"></asp:Label>
</td>
</tr>
<tr>
<td class="tablesingletdlable" valign="top" align="center">
允许上传文件的类型:
<asp:BulletedList ID="bl_FileTypeLimit" runat="server">
</asp:BulletedList>
允许上传单个文件的大小:
<asp:Label ID="lab_FileSizeLimit" runat="server" Text=""></asp:Label>
</td>
<td class="tablesingletdlable" align="left">
<asp:FileUpload ID="FileUpload" runat="server" Width="300px" /><br /><br />
<asp:Button ID="btn_Upload" runat="server" CssClass="button-add-new" Style="height: 26px;
width: 64px; border: 0px;" Text="上传文件" OnClick="btn_Upload_Click" />
</td>
<td class="tablesingletdlable">
<table cellpadding="1" cellspacing="1" class="tablesingle" width="100%">
<tr>
<td>
<!--启用了AutoPostBack-->
<asp:ListBox ID="lb_FileList" runat="server" AutoPostBack="True" Width="300px" Height="400px"
OnSelectedIndexChanged="lb_FileList_SelectedIndexChanged"></asp:ListBox>
</td>
<td valign="top">
<asp:Label ID="lab_FileDescription" runat="server" Text=""></asp:Label>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="btn_Download" runat="server" CssClass="button-add-new" Style="height: 26px;
width: 64px; border: 0px;" Text="下载文件" OnClick="btn_Download_Click" />
<!--在删除前给予确认-->
<asp:Button ID="btn_Delete" runat="server" CssClass="button-add-new" Style="height: 26px;
width: 64px; border: 0px;" Text="删除文件" OnClientClick="return confirm('确定删除文件吗?')"
OnClick="btn_Delete_Click" /><br />
<asp:TextBox ID="tb_FileNewName" runat="server" Width="300px"></asp:TextBox>
<asp:Button ID="btn_Rename" runat="server" CssClass="button-4" Style="height: 26px;
width: 110px; border: 0px;" Text="对文件重命名" OnClick="btn_Rename_Click" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;
using System.Configuration;
using SYIT.Tools.DotNetUI;
public partial class NewsManagement_FileUploadManager : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//防止PostBack后列表信息重复添加
if (!IsPostBack)
{
//初始化文件夹信息
InitFolderInfo();
//初始化上传限制信息
InitUploadLimit();
//初始化文件列表
InitFileList();
}
}
protected void btn_Upload_Click(object sender, EventArgs e)
{
//判断用户是否选择了文件
if (FileUpload.HasFile)
{
//调用自定义方法判断文件类型是否符合要求
if (IsAllowableFileType())
{
//调用自定义方法判断文件大小是否符合要求
if (IsAllowableFileSize())
{
//从config中读取文件上传路径
string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
//从UploadFile中读取文件名
string strFileName = FileUpload.FileName;
//组合成物理路径
string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
//保存文件
FileUpload.SaveAs(strFilePhysicalPath);
//更新文件列表框控件
lb_FileList.Items.Add(strFileName);
//更新文件夹信息
InitFolderInfo();
//调用自定义方法显示提示
ShowMsgHelper.AlertMsg2("文件成功上传!");
//ShowMessageBox("文件成功上传");
}
else
{
//调用自定义方法显示提示
ShowMessageBox("文件大小不符合要求,请参看上传限制");
}
}
else
{
//调用自定义方法显示提示
ShowMessageBox("文件类型不符合要求,请参看上传限制");
}
}
else
{
//调用自定义方法显示提示
ShowMessageBox("请选择一个文件");
}
}
protected void btn_Download_Click(object sender, EventArgs e)
{
//从config中读取文件上传路径
string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
//从列表框控件中读取选择的文件名
string strFileName = lb_FileList.SelectedValue;
//组合成物理路径
string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
//清空输出流
Response.Clear();
//在HTTP头中加入文件名信息
Response.AddHeader("Content-Disposition", "attachment;FileName=" + HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF8));
//定义输出流MIME类型为
Response.ContentType = "application/octet-stream";
//从磁盘读取文件流
System.IO.FileStream fs = System.IO.File.OpenRead(strFilePhysicalPath);
//定义缓冲区大小
byte[] buffer = new byte[102400];
//第一次读取
int i = fs.Read(buffer, 0, buffer.Length);
//如果读取的字节大于0,则使用BinaryWrite()不断向客户端输出文件流
while (i > 0)
{
Response.BinaryWrite(buffer);
i = fs.Read(buffer, 0, buffer.Length);
}
//关闭磁盘文件流
fs.Close();
//关闭输出流
Response.End();
}
protected void btn_Delete_Click(object sender, EventArgs e)
{
//从config中读取文件上传路径
string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
//从列表框控件中读取选择的文件名
string strFileName = lb_FileList.SelectedValue;
//组合成物理路径
string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
//删除文件
System.IO.File.Delete(strFilePhysicalPath);
//更新文件列表框控件
lb_FileList.Items.Remove(lb_FileList.Items.FindByText(strFileName));
//更新文件夹信息
InitFolderInfo();
//更新文件描述信息
tb_FileNewName.Text = "";
//更新重命名文本框
lab_FileDescription.Text = "";
//调用自定义方法显示提示
ShowMessageBox("文件成功删除");
}
protected void btn_Rename_Click(object sender, EventArgs e)
{
//从config中读取文件上传路径
string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
//从列表框控件中读取选择的文件名
string strFileName = lb_FileList.SelectedValue;
//从重命名文本框中读取新文件名
string strFileNewName = tb_FileNewName.Text;
//组合成物理路径
string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
//组合成物理路径
string strFileNewPhysicalPath = Server.MapPath(strFileUploadPath + strFileNewName);
//文件重命名
System.IO.File.Move(strFilePhysicalPath, strFileNewPhysicalPath);
//找到文件列表框控件中的匹配项
ListItem li = lb_FileList.Items.FindByText(strFileName);
//修改文字
li.Text = strFileNewName;
//修改值
li.Value = strFileNewName;
//调用自定义方法显示提示
ShowMessageBox("文件成功重命名");
}
protected void lb_FileList_SelectedIndexChanged(object sender, EventArgs e)
{
//从config中读取文件上传路径
string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
//从列表框控件中读取选择的文件名
string strFileName = lb_FileList.SelectedValue;
//组合成物理路径
string strFilePhysicalPath = Server.MapPath(strFileUploadPath + strFileName);
//根据物理路径实例化文件信息类
FileInfo fi = new FileInfo(strFilePhysicalPath);
//获得文件大小和创建时间并赋值给标签
lab_FileDescription.Text = string.Format("文件大小:{0} 字节<br><br>上传时间:{1}<br>", fi.Length, fi.CreationTime);
//把文件名赋值给重命名文本框
tb_FileNewName.Text = strFileName;
}
private void InitFolderInfo()
{
//从config中读取文件上传路径
string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
//判断上传文件夹是否存在
if (!Directory.Exists(Server.MapPath(strFileUploadPath)))
Directory.CreateDirectory(Server.MapPath(strFileUploadPath));
//组合成物理路径
string strFilePath = Server.MapPath(strFileUploadPath);
//从config中读取文件夹容量限制
double iFolderSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FolderSizeLimit"]);
//声明表示文件夹已用空间的变量并赋初始值
double iFolderCurrentSize = 0;
//获取文件夹中所有文件
FileInfo[] arrFiles = new DirectoryInfo(strFilePath).GetFiles();
//累加文件大小获得已用空间值
foreach (FileInfo fi in arrFiles)
iFolderCurrentSize += Convert.ToInt32(fi.Length / 1024);
//把文件夹容量和已用空间信息赋值给标签
lab_FolderInfo.Text = string.Format("文件夹容量限制:{0} M 已用空间:{1:f2} M", iFolderSizeLimit / 1024, iFolderCurrentSize / 1024);
}
private void InitUploadLimit()
{
//从config中读取上传文件类型限制并根据逗号分割成字符串数组
string[] arrFileTypeLimit = ConfigurationManager.AppSettings["FileTypeLimit"].ToString().Split(',');
//从config中读取上传文件大小限制
double iFileSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]);
//遍历字符串数组把所有项加入项目编号控件
for (int i = 0; i < arrFileTypeLimit.Length; i++)
bl_FileTypeLimit.Items.Add(arrFileTypeLimit[i].ToString());
//把文件大小限制赋值给标签
lab_FileSizeLimit.Text = string.Format("{0:f2} M", iFileSizeLimit / 1024);
}
private void InitFileList()
{
//从config中读取文件上传路径
string strFileUploadPath = ConfigurationManager.AppSettings["FileUploadPath"].ToString();
//组合成物理路径
string strFilePath = Server.MapPath(strFileUploadPath);
//读取文件夹下所有文件
FileInfo[] arrFiles = new DirectoryInfo(strFilePath).GetFiles();
//把文件名逐一添加到列表框控件控件
foreach (FileInfo fi in arrFiles)
lb_FileList.Items.Add(fi.Name);
}
private bool IsAllowableFileSize()
{
//从config中读取上传文件大小限制
double iFileSizeLimit = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]) * 1024;
//文件大小是否超出了大小限制?
if (iFileSizeLimit > FileUpload.PostedFile.ContentLength)
return true;
else
return false;
}
private bool IsAllowableFileType()
{
//从config中读取上传文件类型限制
string strFileTypeLimit = ConfigurationManager.AppSettings["FileTypeLimit"].ToString();
//当前文件扩展名是否能在这个字符串中找到?
if (strFileTypeLimit.IndexOf(Path.GetExtension(FileUpload.FileName).ToLower()) > -1)
return true;
else
return false;
}
private void ShowMessageBox(string strMessaage)
{
ClientScript.RegisterStartupScript(this.GetType(), "", string.Format("<script>alert('{0}')</script>", strMessaage));
}
}
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