wpf download file with progress bar

Question

Hello All thank you for taking the time to read,

so i have upgraded my project from windows forms to wpf because the better ui and you have total control however i have a issue,

the download code is,

 public async Task downloaderpython(string path)
        {

            if(os == "x86")
            {

                if(!Directory.Exists("C:\Temp"))
                {
                    Directory.CreateDirectory("C:\Temp");

                    path = @"C:\Temp\" + "python-3.11.0-amd64.exe";
                    filepath = path;
                    filename = "python-3.11.0-amd64.exe";
                    httpdownloader = new HttpDownloader("https://www.python.org/ftp/python/3.11.0/python-3.11.0-amd64.exe", @"C:\Temp\" + Path.GetFileName("https://www.python.org/ftp/python/3.11.0/python-3.11.0-amd64.exe"));
                    httpdownloader.DownloadCompleted += Httpdownloader_DownloadCompleted;
                    httpdownloader.ProgressChanged += Httpdownloader_ProgressChanged;
                    Task.Run(() => httpdownloader.Start());
                }
                else
                {
                    path = @"C:\Temp\" + "python-3.11.0-amd64.exe";
                    filepath = path;
                    filename = "python-3.11.0-amd64.exe";
                    httpdownloader = new HttpDownloader("https://www.python.org/ftp/python/3.11.0/python-3.11.0-amd64.exe", @"C:\Temp\" + Path.GetFileName("https://www.python.org/ftp/python/3.11.0/python-3.11.0-amd64.exe"));
                    httpdownloader.DownloadCompleted += Httpdownloader_DownloadCompleted;
                    httpdownloader.ProgressChanged += Httpdownloader_ProgressChanged;
                    Task.Run(() => httpdownloader.Start());
                }
            }
            else
            {


                if(!Directory.Exists("C:\Test"))
                {
                    Directory.CreateDirectory("C:\Test");

                    path = @"C:\Temp\" + "python-3.11.0.exe";
                    filepath = path;
                    filename = "python-3.11.0.exe";
                    httpdownloader = new HttpDownloader("https://www.python.org/ftp/python/3.11.0/python-3.11.0.exe", @"C:\Temp\" + Path.GetFileName("https://www.python.org/ftp/python/3.11.0/python-3.11.0.exe"));
                    httpdownloader.DownloadCompleted += Httpdownloader_DownloadCompleted;
                    httpdownloader.ProgressChanged += Httpdownloader_ProgressChanged;
                    Task.Run(() => httpdownloader.Start());
                }
                else
                {
                    path = @"C:\Temp\" + "python-3.11.0.exe";
                    filepath = path;
                    filename = "python-3.11.0.exe";
                    httpdownloader = new HttpDownloader("https://www.python.org/ftp/python/3.11.0/python-3.11.0.exe", @"C:\Temp\" + Path.GetFileName("https://www.python.org/ftp/python/3.11.0/python-3.11.0.exe"));
                    httpdownloader.DownloadCompleted += Httpdownloader_DownloadCompleted;
                    httpdownloader.ProgressChanged += Httpdownloader_ProgressChanged;
                    Task.Run(() => httpdownloader.Start());
                }


            }

so in win forms i used a addon called Altohttp ( this is not available in .netcore )

but the big issue i have is delegates and how to get text block and and getting the required fields here,

        private void Httpdownloader_ProgressChanged(object sender, AltoHttp.ProgressChangedEventArgs e)
        {
            UpdateProgressBar((int)e.Progress);
            lbl_percent.Text = $"{e.Progress.ToString("0.00")} %";
            lbl_speed.Text = string.Format("{0} MB/s", (e.SpeedInBytes / 1024d / 1024d).ToString("0.00"));
            lbl_downloaded.Text = string.Format("{0} MB/s", (httpdownloader.TotalBytesReceived / 1024d / 1024d).ToString("0.00"));
            lbl_status.Text = "Downloading: " + filename;

        }

but unable to do this due to not being able to use Altohttp

second issue i have

        public static void InvokeIfRequired(Control control, MethodInvoker action)
        {
            if (control.IsDisposed)
            {
                return;
            }
            if (control.InvokeRequired)
            {
                try
                {
                    control.Invoke(action);
                }
                catch (ObjectDisposedException) { }
                catch (InvalidOperationException e)
                {
                    // Intercept only invokation errors (a bit tricky)
                    if (!e.Message.Contains("Invoke"))
                    {
                        throw e;
                    }
                }
            }
            else
            {
                action();
            }
        }

delegates for xmal i have no idea how to work around this,

xaml i have currently its only a muck up as i not sure how to proceed and cant seem to find any good tutorials on this,

Accepted Answer

For problems with using ProgressBar to display the download process in wpf, you could try to refer to the code below.

Xaml:

Codebehind:

 public class ViewModel

{
    CollectionViewSource cvs = new CollectionViewSource();
    public ICollectionView View { get => cvs.View; }
    public ObservableCollection MyClients;
    public ViewModel()
    {

        cvs.Source = GetData();
    }
    private ObservableCollection GetData()
    {
        ObservableCollection MyClients = new ObservableCollection();

        MyClients.Add(new Clients() { Id = 1, Text = "https://sample-videos.com/doc/Sample-doc-file-1000kb.doc" });
        MyClients.Add(new Clients() { Id = 3, Text = "https://freetestdata.com/wp-content/uploads/2021/09/1-MB-DOC.doc" });


        return MyClients;
    }
}

public class Clients : ICommand, INotifyPropertyChanged
{
    public Clients() => disp = Dispatcher.CurrentDispatcher;

    private Dispatcher disp;
    public int Id { get; set; }
    public string Text { get; set; }
    public int Status { get; set; }
    public string ProgressValue { get; set; }

    WebClient client1 = new WebClient();
    public void Execute(object parameter)
    {
        if (client1.IsBusy) return;
        Progress = 0;
        Uri uri = new Uri(Text);
        String FileName = System.IO.Path.GetFileName(uri.AbsolutePath);
        client1.DownloadFileAsync(uri, @"C:\Users\Administrator\Desktop\" + FileName);
        client1.DownloadProgressChanged += downloadprogress;
        client1.DownloadFileCompleted += Client_DownloadFileCompleted;
    }
    public double Progress { get; set; }
    private void downloadprogress(object sender, DownloadProgressChangedEventArgs e)
    {
        Progress = e.ProgressPercentage;
        double receive = double.Parse(e.BytesReceived.ToString());
        double total = double.Parse(e.TotalBytesToReceive.ToString());
        double percentage = receive / total * 100;

      
            ProgressValue = $"{string.Format("{0:0.##}", percentage)}%";
            Status = int.Parse(Math.Truncate(percentage).ToString());

        
        OnPropertyChanged(nameof(Progress));
        OnPropertyChanged(nameof(ProgressValue));
        OnPropertyChanged(nameof(Status));
    }
    private void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
    {
        System.Windows.Forms.MessageBox.Show("Download OK!", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    public event EventHandler CanExecuteChanged;
    public bool CanExecute(object parameter) => true;
    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged([CallerMemberName] string propName = "") => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
}

The result:

-

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wpf download file with progress bar

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