一个专门用于文件下载的类。实现文件下载时流量等相关信息的处理。

本文介绍了一个专门用于文件下载的类的实现，支持大文件下载、断点续传、限速等功能，通过使用C#和ASP.NET技术实现了高效的文件传输。

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转自：http://topic.youkuaiyun.com/u/20071013/09/7A6B96A3-8001-40E9-B2D4-E624631F4455.html

写一个专门用于文件下载的类。实现文件下载时流量等相关信息的处理。

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; using System.Threading; /// <summary> /// FileDownload 的摘要说明 /// </summary> public class FileDownload { /// <summary> /// 输出硬盘文件，提供下载支持大文件、续传、速度限制、资源占用小 /// </summary> /// <param name="_Request">Page.Request对象 </param> /// <param name="_Response">Page.Response对象 </param> /// <param name="_fileName">下载文件名 </param> /// <param name="_fullPath">带文件名下载路径 </param> /// <param name="_speed">每秒允许下载的字节数 </param> /// <returns>返回是否成功 </returns> 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((decimal)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((decimal)(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; } }