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>
    /// 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="MyRequest">Page.Request对象</param>
    /// <param name="MyResponse">Page.Response对象</param>
    /// <param name="MyFileName">下载文件名</param>
    /// <param name="MyFullPath">带文件名下载路径</param>
    /// <param name="MySpeed">每秒允许下载的字节数</param>
    /// <returns>True Or False</returns>
    public bool ResponseFile(HttpRequest MyRequest, HttpResponse MyResponse, string MyFileName, string MyFullPath, long MySpeed)
    {
         try
         {
            FileStream myFile = new FileStream(MyFullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            BinaryReader br = new BinaryReader(myFile);
            try
            {
                MyResponse.AddHeader("Accept-Ranges", "bytes");
                MyResponse.Buffer = false;
                
                long fileLength = myFile.Length;
                long startBytes = 0;
                int pack = 10240;     //10K bytes
                int sleep = (int)Math.Floor(1000.0 * pack / MySpeed) + 1;
               
                if (MyRequest.Headers["Range"] != null)
                {
                    MyResponse.StatusCode = 206;
                    string[] range = MyRequest.Headers["Range"].Split(new char[] { '=', '-' });
                    startBytes = Convert.ToInt64(range[1]);
                }
               
                MyResponse.AddHeader("Content-Length", (fileLength - startBytes).ToString());
                
                if ((startBytes != 0))
                {
                    MyResponse.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength - 1, fileLength));
                }

                MyResponse.AddHeader("Connection", "Keep-Alive");
                MyResponse.ContentType = "application/octet-stream";
                MyResponse.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(MyFileName, System.Text.Encoding.UTF8));
                br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
                
                int maxCount = (int)Math.Floor(1.0*(fileLength - startBytes) / pack) + 1;

                for (int i = 0; i <= maxCount; i++)
                {
                    if ((MyResponse.IsClientConnected))
                    {
                        MyResponse.BinaryWrite(br.ReadBytes(pack));
                        System.Threading.Thread.Sleep(sleep);
                    }
                    else
                    {
                        i = maxCount;
                    }
                 }
            }
            catch
            {
                return false;
            }
            finally
            {
                br.Close();myFile.Close();
            }
         }
         catch
         {
            return false;
         }
         return true;
    }

 

直接调用就行了.如
ResponseFile(Request, Response, "MyText.txt", @"D:/testtable.txt", 200 * 1024);