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ASP.NET文件下载函数使用浅析

http://www.sina.com.cn  2010年03月11日 02:11  《程序员》

  ASP.NET文件下载函数使用是什么情况呢?在你的Page_Load中添加这样的代码:

  Page.Response.Clear();

  bool success = ResponseFile(Page.Request, Page.Response, "目的文件名称", @"源文件路径", 1024000);

  if (!success) Response.Write("下载文件出错!"); Page.Response.End();

  ASP.NET文件下载函数代码为:

  public static 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; double pack = 10240;

  //10K bytes

  //int sleep = 200;

  //每秒5次 即5*10K bytes每秒 int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;

  if (_Request.Headers["Range"] != null)

  {

  _Response.StatusCode = 206;

  string[] range = _Request.Headers["Range"].Split(new char[] {'=', '-'});

  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);

  int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;

  for (int i = 0; i < maxCount; i++) { if (_Response.IsClientConnected) { _Response.BinaryWrite(br.ReadBytes(int.Parse(pack.ToString()))); Thread.Sleep(sleep);

  } else { i=maxCount;

  }

  } }

  catch

  {

  return false;

  }

  finally

  {

  br.Close();

  myFile.Close();

  }

  }

  catch

  {

  return false;

  }

  return true;

  }

  这样就实现了文件下载时,不管是什么格式的文件,都能够弹出打开/保存窗口.

  ASP.NET文件下载函数的基本情况就向你介绍到这里,希望对你了解ASP.NET文件下载函数有所帮助。

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