怎么用asp.net做文件下载？急

Question

各位高手，小的已经做好上传的但是下载做不来，求救

Answer 1

搜一下吧， 多的很提示个简单的： Response.TransmitFile()

Answer 2

/***************此主转自：**********/
*http://www.xnovo.com/doc/html/afaebd/bhaebeaaijnsjeivml.html     
/***********************************/ASP.NET提供文件下载函数 
  
// 输出硬盘文件，提供下载// 输入参数 _Request: Page.Request对象， _Response: Page.Response对象， _fileName: 下载文件名， _fullPath: 带文件名下载路径， _speed 每秒允许下载的字节数// 返回是否成功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;int 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(pack));Thread.Sleep(sleep);}else{i=maxCount; }}}catch{return false;}finally{br.Close();myFile.Close();}}catch{return false;}return true;}调用例Page.Response.Clear();bool success = ResponseFile(Page.Request, Page.Response, "filename", @"C:\download.date", 1024000);if(!success)Response.Write("下载文件出错！");Page.Response.End();