MVC埰坑日记 文件权限

  public static void DownLoadFile(string FileFullPath)
        {
            if (!string.IsNullOrEmpty(FileFullPath) && FileExists(FileFullPath))
            {
                FileInfo fi = new FileInfo(FileFullPath);//文件信息
                FileFullPath = HttpUtility.UrlEncode(Path.GetFileName(FileFullPath)); //对文件名编码
                FileFullPath = FileFullPath.Replace("+", "%20"); //解决空格被编码为"+"号的问题
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=" + FileFullPath);
                HttpContext.Current.Response.AppendHeader("content-length", fi.Length.ToString()); //文件长度
                int chunkSize = 102400;//缓存区大小,可根据服务器性能及网络情况进行修改
                byte[] buffer = new byte[chunkSize]; //缓存区
                using (FileStream fs = fi.Open(FileMode.Open))  //打开一个文件流
                {
                    while (fs.Position >= 0 && HttpContext.Current.Response.IsClientConnected) //如果没到文件尾并且客户在线
                    {
                        int tmp = fs.Read(buffer, 0, chunkSize);//读取一块文件
                        if (tmp <= 0) break; //tmp=0说明文件已经读取完毕,则跳出循环
                        HttpContext.Current.Response.OutputStream.Write(buffer, 0, tmp);//向客户端传送一块文件
                        HttpContext.Current.Response.Flush();//保证缓存全部送出
                        Thread.Sleep(10);//主线程休息一下,以释放CPU
                    }
                }
            }
        }