How to display the Progress Bar using thread when load data to data grid in WPF?

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Have used to display the progress Bar using thread concept when load data to data grid in WPF. the following codes are used.

public partial class MainWindow : Window
    {
        private  bool firstLoad = true;      
        private delegate void SimpleDelegate();
        DataSet ds = new DataSet();
        CollectionView view;
        public MainWindow()
        {
           InitializeComponent();
            BackgroundWorker worker = new BackgroundWorker();
            worker.DoWork += new DoWorkEventHandler(RunOnBGThread);
            worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(BGThreadWorkDone);
            worker.RunWorkerAsync();
            BackgroundWorker worker1 = new BackgroundWorker();
            worker1.DoWork += new DoWorkEventHandler(RunOnBGThreadProgressBas);
            worker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(BGThreadWorkDone);
            worker1.RunWorkerAsync();		
        }
        private void RunOnBGThread(object sender, DoWorkEventArgs e)
        {
            LoadProcess();
        }       
        private void LoadProcess()
        {
            try
            {
                SimpleDelegate del1 = delegate()
                {                                        
                    if (firstLoad)
                    {
                         
                        firstLoad = false;                       
                        SqlHelper.FillDataset(Application.Current.Properties["constr"].ToString(), CommandType.Text, "select * from account a left join transscheme ts on ts.schemecode = a.scheme where dist_code='c' order by acct_code", ds, new String[] { "tab_grdbindload" });
                         this.DataContext = ds.Tables["tab_grdbindload"];
                         view = (CollectionView)(CollectionViewSource.GetDefaultView(ds.Tables["tab_grdbindload"]));
                         grd_boview.ItemsSource = view;    
                     
                    }                    
                };
                this.Dispatcher.BeginInvoke(DispatcherPriority.Send, del1);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }		
        }
        private void BGThreadWorkDone(object sender, RunWorkerCompletedEventArgs e)
        {
            prgbar.Visibility = Visibility.Collapsed;  
        }
        private void RunOnBGThreadProgressBas(object sender, DoWorkEventArgs e)
        {
            Duration dd = new Duration(new TimeSpan(10));  //creating an object of the duration class.
            DoubleAnimation da = new DoubleAnimation(30.0, dd); 
           prgbar.BeginAnimation(ProgressBar.ValueProperty, da);
        }
    }
}

In this above code the following error was thrown "The calling thread cannot access this object because a different thread owns it." the line of code "prgbar.BeginAnimation(ProgressBar.ValueProperty, da);".
Please advice me how to use the thread while load the progress bar.

Posted 17-Jul-11 20:58pm

lakshmi.ksangam

Updated 17-Jul-11 21:14pm

Toniyo Jackson

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-07-17T21:12:00

Solution 1

This method also should not be called on you non-UI thread but invoked on the UI thread using Dispatcher.Invoke or Dispatcher.BeginInvoke. You cannot call anything on UI from non UI thread.

You will find detailed explanation of how it works and code samples in my past answers:
Control.Invoke() vs. Control.BeginInvoke()[^],
Problem with Treeview Scanner And MD5[^].

See also more references on threading:
How to get a keydown event to operate on a different thread in vb.net[^],
Control events not firing after enable disable + multithreading[^].

[EDIT]
This is how to work with delegate needed for invocation properly:

C#

void UpdateProgressBar(Dispatcher dispatcher, ProgressBar progressBar, double value) {
dispatcher.BeginInvoke(
    new Action<ProgressBar, double>(
        (progressBarInstance, newValue) => {
            progressBarInstance.Value = newValue;
        }), progressBar, value);
} //UpdateProgressBar

The body of the anonymous delegate instance comes between "{}" above.

—SA

Posted 17-Jul-11 21:12pm

Sergey Alexandrovich Kryukov

Updated 18-Jul-11 5:23am

v3

Comments

lakshmi.ksangam 18-Jul-11 3:23am

Thanks for ur reply..

Have used Dispatcher.BeginInvoke. but progress bar was not updated. for ur reference below mention the code..

private void RunOnBGThreadProgressBas(object sender, DoWorkEventArgs e)
{
SimpleDelegate del2 = delegate()
{
Duration dd = new Duration(new TimeSpan(10));
DoubleAnimation da = new DoubleAnimation(30.0, dd);
prgbar.BeginAnimation(ProgressBar.ValueProperty, da);

};
this.Dispatcher.BeginInvoke(DispatcherPriority.Send, del2);
}

Sergey Alexandrovich Kryukov 18-Jul-11 11:09am

I did not check it up, not sure I have all the data, but you don't need animation. Just assign Value the the value of your progress.
Also, I don't see invocation. Your work with delegates is very cumbersome.
--SA

Sergey Alexandrovich Kryukov 18-Jul-11 11:23am

Please see the code sample above, after [EDIT].
--SA

Espen Harlinn 18-Jul-11 8:37am

Good reply, my 5

Sergey Alexandrovich Kryukov 18-Jul-11 11:04am

Thank you, Espen.
--SA