Conris.Utility/Files.Download.cs

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Web;
using System.Threading;

namespace Conris.Utility.Files
{
    public static class Download
    {
        /// <summary>
        /// 文件下载
        /// </summary>
        /// <param name="_Request"></param>
        /// <param name="_Response"></param>
        /// <param name="_fileName"></param>
        /// <param name="_fullPath"></param>
        /// <param name="_speed">单位为Bytes</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";

                    if (_Request.ServerVariables["http_user_agent"].ToLower().Contains("firefox"))
                        _fileName = "=?UTF-8?B?" + Convert.ToBase64String(Encoding.UTF8.GetBytes(_fileName)) + "?=";
                    else
                        _fileName = HttpUtility.UrlEncode(_fileName, System.Text.Encoding.UTF8);

                    _Response.AddHeader("Content-Disposition", "attachment;filename=\"" + _fileName + "\"");

                    br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
                    int maxCount = (int)Math.Floor((fileLength - startBytes) / pack) + 1;