C# wpf下载问题，有没有解答一下。C# wpf有这么坑嘛？

使用httpwebrequest下载视频文件速度慢，无法打开播放。以及webclient下载速度慢，会中断致使文件下载不完整。

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
                        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                        //byte[] byteArr = webClient.DownloadData(url);
                        //string contentEncoding = webClient.ResponseHeaders["Content-Encoding"];
                        if (response.ContentEncoding == "gzip")
                        {
                            //Stream stream = new MemoryStream(byteArr);
                            Stream stream = response.GetResponseStream();
                            using (Stream zipStream = new GZipStream(stream, CompressionMode.Decompress))
                            {
                                using (Stream fileStream = new FileStream(address, FileMode.Create))
                                {
                                    byte[] read = new byte[1024];
                                    int readlen = zipStream.Read(read, 0, read.Length);
                                    while (readlen > 0)
                                    {
                                        fileStream.Write(read, 0, read.Length);
                                        readlen = zipStream.Read(read, 0, read.Length);
                                    }
                                    //fileStream.Close();
                                    //zipStream.Close();
                                    //stream.Close();
                                }
                            }
                            stream.Close();
                        }
                        else
                        {
                            webClient.DownloadFile(new Uri(url), address);
                            //Stream stream = new MemoryStream(byteArr);
                            //Stream stream = response.GetResponseStream();
                            //stream.ReadTimeout = -1;
                            //using (FileStream fileStream = new FileStream(address, FileMode.Create))
                            //{
                            //    byte[] read = new byte[1024];
                            //    int readlen = stream.Read(read, 0, read.Length);
                            //    while (readlen > 0)
                            //    {
                            //        fileStream.Write(read, 0, read.Length);
                            //        readlen = stream.Read(read, 0, read.Length);
                            //    }
                            //    //fileStream.Close();
                            //}
                            //stream.Close();
                        }

使用webclient下载视频文件出现速度慢，下载视频文件不完整的问题。突然结束中断。使用httpwebrequest下载的视频打不开，虽然下载的视频文件不是完整的。（webclient下载的不完整但是可以播放）

我的解答思路和尝试过的方法

我想要达到的结果

已解决。代码错误。

可以尝试多线程下载 然后合并
中断的部分可以考虑断点续传