Xamarin, UWP: Youtube downloader

This recipe shows how to download the videos from Youtube by Xamarin Android, Universal App.

NOTE : install YoutubeExtractor from Nuget.

Follow these steps to get the download URLs

// Our test youtube link
string link = "insert youtube link";

/*
 * Get the available video formats.
 * We'll work with them in the video and audio download examples.
 */
IEnumerable<VideoInfo> videoInfos = DownloadUrlResolver.GetDownloadUrls(link);

Xamarin Android: Download  videos 

NOTE: In Xamarin Android you have to search any video and then you click that video -> navigate to new paper -> so you can download video here

async void Download_Click(object sender, EventArgs e)

        {
 // create WebCLient() 
            var webClient = new WebClient();

            if (!string.IsNullOrEmpty(video_url))

            {
     
                byte[] bytes = null;



                webClient.DownloadProgressChanged += WebClient_DownloadProgressChanged;

                dialog = new ProgressDialog(this);

                dialog.SetProgressStyle(ProgressDialogStyle.Horizontal);

                dialog.SetTitle("Downloading...");

                dialog.SetCancelable(false);

                dialog.SetCanceledOnTouchOutside(false);

                dialog.Show();



                try

                {
           //Downloads the resource as a Byte array from the URI specified as an asynchronous operation using a task object.
                    bytes = await webClient.DownloadDataTaskAsync(video_url);

                }

                catch (TaskCanceledException)

                {

                    Toast.MakeText(this, "Task Canceled", ToastLength.Long).Show();

                    return;

                }

                catch (Exception a)

                {

                    Toast.MakeText(this, a.InnerException.Message, ToastLength.Long).Show();

                    dialog.Progress = 0;

                    return;

                }


     //save a video to the path is "My files/ Device storage/ Download"
                var documentsPath = Android.OS.Environment.ExternalStorageDirectory + "/Download";

      // remove all special symbol in video title
                string localFilename = video_title

                    .Replace('.', 'a')

                    .Replace('-', 'a')

                    .Replace('(', 'a')

                    .Replace(')', 'a')

                    .Replace('"', 'a')

                    .Replace(',', 'a')

                    + video_extension;




     //combine the path and file name together
                string localPath = System.IO.Path.Combine(documentsPath, localFilename);



                dialog.SetTitle("Download Complete");



                //Save file by using writeAsync

                FileStream fs = new FileStream(localPath, FileMode.OpenOrCreate);

                await fs.WriteAsync(bytes, 0, bytes.Length);

                fs.Close();



                dialog.Progress = 0;

            }



        }



        void WebClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)

        {

            dialog.Progress = e.ProgressPercentage;

            if (e.ProgressPercentage == 100)

            {

                dialog.Hide();

            }

        }

UWP: Download videos

public DownloadViewModel(string video_url, string title, string thumb, string type)
        
        {
            DownloadManager(video_url, title, thumb, type);

        }

        private async void DownloadManager(string video_url, string title, string thumb, string type)
        {
            this.Title = title;
            this.Thumbail = thumb;
            string result_title = this.Title.Replace("-", " ")
                .Replace("&", " ")
                .Replace("/", " ")
                .Replace("!", " ")
                .Replace("(", "")
                .Replace(":", "")
                .Replace(")", "");

  //BackgrounDownloader used to configure downloads prior to the actual creation of the download operation using CreateDownload
            var bgDownloader = new BackgroundDownloader();
  //get the path of VideosLibrary on PC or Phone
            StorageFolder folder = KnownFolders.VideosLibrary;
            var part = await folder.CreateFileAsync(result_title + type, CreationCollisionOption.ReplaceExisting);
            DownloadOperation downloadOperation = bgDownloader.CreateDownload(new Uri(video_url), part);

            await StartDonwloadAsync(downloadOperation);
        }


        private async Task StartDonwloadAsync(DownloadOperation obj)
        {
            var process = new Progress<DownloadOperation>(ProgressCallback);
            await obj.StartAsync().AsTask(process);
        }

        private void ProgressCallback(DownloadOperation obj)
        {
            this.Status = "Downloading...";
            this.Downloaded = string.Format("{0:0,000}", (double)(obj.Progress.BytesReceived / 1024));
            this.Percentage = ((double)obj.Progress.BytesReceived / obj.Progress.TotalBytesToReceive) * 100;
            if(percentage>=100)
            {
                this.Status = "Completed";
                this.Percentage = 0.0;
            }
        }

Screenshot

Android

UWP

Source

https://code.msdn.microsoft.com/Android-Youtube-Downloader-1c9cc7f0

https://code.msdn.microsoft.com/UWP-Youtube-Downloader-773d7e91