多文件上传 | 易学教程

---StyleSheet.css

.bluebutton
{
background-color:LightSteelBlue;
border-style:solid;
border-width: 1px;
border-color: LightSkyBlue;
}

---Attachme.aspx

<%@ Page language="c#" Codebehind="Attachme.aspx.cs" AutoEventWireup="false" Inherits="UploadFile.Attachme" %>
<HTML>
<HEAD>
  <title>多文件上传</title>
  <LINK href="StyleSheet.css" rel="stylesheet">
</HEAD>
<body>
  <form id="attachme" method="post" encType="multipart/form-data" runat="server">
   <INPUT class="bluebutton" id="FindFile" type="file" size="26" runat="server" NAME="FindFile">
   <BR>
   <asp:listbox id="FileList" runat="server" CssClass="txtbox" Height="100px" Width="274px" SelectionMode="Multiple"></asp:listbox><BR>
   <asp:button id="AddFile" runat="server" CssClass="bluebutton" Height="23px" Width="72px" Text="添加文件"></asp:button>
   <asp:button id="RemvFile" runat="server" CssClass="bluebutton" Height="23px" Width="72px" Text="删除文件"></asp:button>
   <INPUT class="bluebutton" id="Upload" type="submit" value="上传" runat="server" onserverclick="Upload_ServerClick"
    NAME="Upload">
  </form>
  <asp:label id="TipInfo" runat="server" Height="25px" Width="249px"></asp:label>
</body>
</HTML>

---Attachme.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace UploadFile
{
/// <summary>
/// 多文件上传
/// </summary>
public class Attachme : System.Web.UI.Page
{
  protected System.Web.UI.WebControls.Button AddFile;
  protected System.Web.UI.WebControls.Button RemvFile;
  protected System.Web.UI.HtmlControls.HtmlInputFile FindFile;
  protected System.Web.UI.HtmlControls.HtmlInputButton Upload;
  protected System.Web.UI.HtmlControls.HtmlGenericControl txtOutput;
  protected System.Web.UI.WebControls.ListBox FileList;
  protected System.Web.UI.WebControls.Label TipInfo;

  static public ArrayList hif = new ArrayList(); // 保存文件列表
  public int filesUploaded = 0; // 上传文件的数量

  private void Page_Load(object sender, System.EventArgs e)
  {
  }

  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   InitializeComponent();
   base.OnInit(e);
  }

  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {
   this.AddFile.Click += new System.EventHandler(this.AddFile_Click);
   this.RemvFile.Click += new System.EventHandler(this.RemvFile_Click);
   this.Upload.ServerClick += new System.EventHandler(this.Upload_ServerClick);
   this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion

  /// <summary>
  /// 将要上传的文件添加到listbox中
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void AddFile_Click(object sender, System.EventArgs e)
  {
   if (Page.IsPostBack == true)
   {
    hif.Add(FindFile);
    FileList.Items.Add(FindFile.PostedFile.FileName);
   }
   else
   {}
  }

  /// <summary>
  /// 从listbox中删除指定的文件
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void RemvFile_Click(object sender, System.EventArgs e)
  {
   if(FileList.SelectedIndex == -1)
   {
    TipInfo.Text = "错误 - 必须指定要删除的文件.";
    return;
   }
   else if(FileList.Items.Count != 0)
   {
    hif.RemoveAt(FileList.SelectedIndex);
    FileList.Items.Remove(FileList.SelectedItem.Text);
    TipInfo.Text = "";
   }
  }

  /// <summary>
  /// 循环上传listbox中的文件到指定的文件夹下
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  public void Upload_ServerClick(object sender, System.EventArgs e)
  {
   string baseLocation = Server.MapPath("UploadFiles/"); // 上传路径
   string status = ""; // 上传成功后显示的文件列表

   if((FileList.Items.Count == 0) && (filesUploaded == 0))
   {
    TipInfo.Text = "错误 - 必须指定要上传的文件.";
    return;
   }
   else
   {
    foreach(System.Web.UI.HtmlControls.HtmlInputFile HIF in hif)
    {
     try
     {
      string fn = System.IO.Path.GetFileName(HIF.PostedFile.FileName);
      HIF.PostedFile.SaveAs(baseLocation + fn);
      filesUploaded++;
      status += fn + "<br>";
     }
     catch(Exception err)
     {
      TipInfo.Text = "上传错误 " + baseLocation
       + "<br>" + err.ToString();
     }
    }

    if(filesUploaded == hif.Count)
    {
     TipInfo.Text = "共上传了 " + filesUploaded + " 个文件。 <br>" + status;
    }
    hif.Clear();
    FileList.Items.Clear();
   }
  }
}
}

效果图

来源：https://www.cnblogs.com/Cohlint/archive/2005/12/09/293893.html

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filelist