多文件上传

---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" %>

 
  
  
 
 
  

   
   

   

   
   
       NAME="Upload">
  

  
 

---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
{
 ///

 /// 多文件上传
 ///

 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);
  }
       
  ///

  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  ///

  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

  ///

  /// 将要上传的文件添加到listbox中
  ///

  ///
  ///
  private void AddFile_Click(object sender, System.EventArgs e)
  {
   if (Page.IsPostBack == true)
   {
    hif.Add(FindFile);
    FileList.Items.Add(FindFile.PostedFile.FileName);
   }
   else
   {}
  }

  ///

  /// 从listbox中删除指定的文件
  ///

  ///
  ///
  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 = "";
   }          
  }

  ///

  /// 循环上传listbox中的文件到指定的文件夹下
  ///

  ///
  ///
  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 + "
";
     }
     catch(Exception err)
     {
      TipInfo.Text = "上传错误 " + baseLocation
       + "
" + err.ToString();
     }
    }

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

效果图

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