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ASP.NET上傳和下載檔案的代碼

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上傳:(可以實現依次上傳多個檔案)

前台:

<%@ Register TagPrefix="ew1" Namespace="eWorld.UI" Assembly="eWorld.UI, Version=1.9.0.0, Culture=neutral, PublicKeyToken=24d65337282035f2" %>
<%@ Page language="c#" Codebehind="webNewBid.aspx.cs" AutoEventWireup="false" Inherits="STAR.Web.main.Bidding.WebNewBid" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
 <HEAD>
  <title>WebNewBid</title>
  <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
  <meta content="C#" name="CODE_LANGUAGE">
  <meta content="JavaScript" name="vs_defaultClientScript">
  <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
  <LINK href="../../css/style.css" type="text/css" rel="stylesheet">
  <script language="JavaScript">
  function addFile()
  {
      var str = '<BR><INPUT type="file" size="50" NAME="File" runat="server">'
      document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str)
  }
  </script>
 </HEAD>
        <body MS_POSITIONING="GridLayout">
  <form id="Form1" method="post" runat="server">
   <table class="fullwidth" align="center">
                        <TR>
        <TD vAlign="top">Attachment :</TD>
        <TD>
         <P id="MyFile"><input id="filMyFile" type="file" size="50" name="filMyFile">&nbsp;<input onclick="addFile()" type="button" value="Add"></P>
         <asp:label id="lblAttachmentError" runat="server" ForeColor="Red"></asp:label><BR>
         <asp:button id="btnUpload" runat="server" Text="Upload"></asp:button><asp:label id="lblAttachment" runat="server"></asp:label></TD>
       </TR>
</table>
  </form>
 </body>
</HTML>

後台:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Collections.Specialized;
private void btnUpload_Click(object sender, System.EventArgs e)
  {
                        HttpFileCollection files  = HttpContext.Current.Request.Files;
   for(int i = 0; i < files.Count; i++)
   {
    if (i<files.Count&&i<10)
    {
     if (files[i].FileName!="" || files[i] != null)
     {
      int FileSize = 6*1024*1024;      
      HttpPostedFile myFile = files[i];
      string strFilePath = myFile.FileName.ToString().Trim();
      this.lblAttachmentError.Text = "<" + strFilePath + ">"; // Show file name
      int nFindSlashPos  = strFilePath.Trim().LastIndexOf("//")+1;   
      string UploadFileName=strFilePath.Substring(nFindSlashPos);
      string FileName=this.txtWorkOrder.Text+"_"+string.Format("{0:yyMMdd-hhmmss}",DateTime.Now)+"_"+UploadFileName;

      if(myFile.FileName.Trim() == "") // Empty value in Browse Box
      {
       this.lblAttachmentError.Text="No file selected.";
       return;
      }

      if(myFile.ContentLength != 0)
      {
       if (myFile.ContentLength > FileSize)
       {
        this.lblAttachmentError.Text="File Size is limited to 6 MB only.";
        return;
       }
       this.lblAttachment.Text+= "<BR>"+FileName;
       this.lblAttachmentError.Text=""; 
       //       string s=this.Request.PhysicalApplicationPath.ToString().Trim();
       //       string s1=this.Request.ApplicationPath.ToString().Trim();
       //       string s3=this.Server.MapPath("");
       myFile.SaveAs(this.Request.PhysicalApplicationPath.ToString().Trim()+@"/uploads/" + FileName);
       ArrayFileName[i]= FileName;
//       //       return;
      }
      else
      {
       this.lblAttachmentError.Text="File not found.";
       return;
      }
     }
    }
    else
     this.lblAttachmentError.Text="Uploaded File exceed limits.";
   }
  }

下載:(我只給了後太代碼)

public bool ResponseFile(HttpRequest _Request, HttpResponse _Response, string _fileName, string _fullPath, long _speed)
{
 try {
   FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
   BinaryReader br = new BinaryReader(myFile);
   try {
     _Response.AddHeader("Accept-Ranges", "bytes");
     _Response.Buffer = false;
     long fileLength = myFile.Length;
     long startBytes = 0;
     Int16 pack = 10240;
     Int16 sleep = Convert.ToInt16(Math.Floor(1000 * pack / _speed) + 1);
     if (!(_Request.Headers("Range") == null)) {
       _Response.StatusCode = 206;
       char[] splitChar = new char[1];
       splitChar(0) = "=";
       splitChar(1) = "-";
       string[][0] range = _Request.Headers("Range").Split("a");
       startBytes = Convert.ToInt64(range(1));
     }
     _Response.AddHeader("Content-Length", (fileLength - startBytes).ToString());
     if ((startBytes != 0)) {
       _Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength - 1, fileLength));
     }
     _Response.AddHeader("Connection", "Keep-Alive");
     _Response.ContentType = "application/octet-stream";
     _Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(_fileName, System.Text.Encoding.UTF8));
     br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
     long maxCount = Convert.ToInt64(Math.Floor((fileLength - startBytes) / pack) + 1);
     long i;
     for (int i = 0; i <= maxCount; i++) {
       if ((_Response.IsClientConnected)) {
         _Response.BinaryWrite(br.ReadBytes(pack));
         Thread.Sleep(sleep);
       } else {
         i = maxCount;
       }
     }
   } catch (Exception e) {
     return false;
   } finally {
     br.Close();
     myFile.Close();
   }
 } catch {
   return false;
 }
}

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