using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.IO; using System.Threading; namespace ProjectWenDangManage.Framework {     /// <summary>     /// HTTP文件下载辅助类     /// </summary>     public class HttpDownLoadHelper     {         /// <summary>         /// 文件下载         /// </summary>         /// <param name="_Request"></param>         /// <param name="_Response"></param>         /// <param name="_fileName">下载文件时的短文件名称</param>         /// <param name="_fullPath">待下载文件的绝对路径</param>         /// <param name="_speed">下载速度</param>         /// <returns></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;                     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;                         }                     }                     return true;                 }                 catch                 {                     return false;                 }                 finally                 {                     br.Close();                     myFile.Close();                 }             }             catch             {                 return false;             }         }     } } HttpDownLoadHelper

string filePath=Path.Combine(HttpRuntime.AppDomainAppPath,"Files","项目管理工具.msi"); HttpDownLoadHelper.ResponseFile(Request, Response, "下载显示的名称", filePath, 102400);

string filePath=Path.Combine(HttpRuntime.AppDomainAppPath,"Files","项目管理工具.msi"); HttpDownLoadHelper.ResponseFile(HttpContext.ApplicationInstance.Context.Request, HttpContext.ApplicationInstance.Context.Response, "下载显示的名称", filePath, 102400);