播放非网站目录下的Flv文件

最近做了一个小项目，其中有一个功能是播放Flv文件，Flv文件存放在服务器的非网站目录下，不能使用虚拟路径进行访问，同时由于视频文件超过1OOM，因此播放的时候同时需要考虑到内存的占用，最终采用后台获取文件输出到Response，使用 Vcastr22.swf 播放器进行播放.具体代码如下:

 

protected void Page_Load(object sender, EventArgs e)
        {
            int SubjectID = ConvertHelper.ObjectToInt(RequestHelper.GetQueryString("ID"), 0);
            var LoginUser = CustomBase.GetLoginUser();
            if (LoginUser == null)
            {
                Response.Write("用户未登陆！");
                Response.End();
                return;
            }
            var Subject = BusinessLogic.SubjectService.GetSubject(SubjectID);
            if (Subject == null)
            {
                Response.Write("找不到该课程！");
                Response.End();
                return;
            };

            var userList = BusinessLogic.UserService.GetUserCategory(LoginUser.ID);
            if (userList.Count(n => n.ID.Equals(Subject.CategoryID)) == 0)
            {
                Response.Write("用户未开通该课程！");
                Response.End();
                return;
            }

            if (DirFileHelper.IsExistFile(Subject.Vedio))
            {

                //输出到浏览器
                try
                {
                    const long ChunkSize = 102400;
                    byte[] buffer = new byte[ChunkSize];

                    Response.Clear();
                    System.IO.FileStream iStream = System.IO.File.OpenRead(Subject.Vedio);
                    long dataLengthToRead = iStream.Length;
                    var ext = DirFileHelper.GetExtension(Subject.Vedio);
                    if (ext.ToLower().Equals(".swf"))
                    {
                        Response.ContentType = "application/x-shockwave-flash";
                    }
                    else if (ext.ToLower().Equals(".flv"))
                    {
                        Response.ContentType = "vedio/x-flv";
                    }

                    while (dataLengthToRead > 0 && Response.IsClientConnected)
                    {
                        int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));
                        Response.OutputStream.Write(buffer, 0, lengthRead);
                        Response.Flush();
                        dataLengthToRead = dataLengthToRead - lengthRead;
                    }
                    Response.Close();
                }
                catch (Exception ex) {
                    Response.Write(ex.Message);
                }
            }
        }