When to use invoke and begininvoke in wpf

Question

Sachin Singh · Answer

Control.Invoke : Executes on the UI thread, but calling thread waits for completion before continuing. Control.BeginInvoke : Executes on the UI thread, and calling thread doesn't wait for completion. Delegate.Invoke : Executes synchronously, on the same thread. Delegate.BeginInvoke : Executes asynchronously, on a threadpool thread. credit:- https://stackoverflow.com/questions/229554/whats-the-difference-between-invoke-and-begininvoke

Rajanikant Hawaldar · Answer

Invoke is Synchronous whereas BeginInvoke is Asynchronous, which means in case of Invoke, control will not return to the calling object until the callback returns. If you are OK with blocking calls, then you can choose Invoke. create one simple app add one textbox and enter some text and add two buttons and see how threads are working. public MainWindow() { InitializeComponent(); txt.Text = "HI"; } private void invoke_Click(object sender, RoutedEventArgs e) { string enteredText = ""; txt.Dispatcher.Invoke(new Action(() => enteredText = txt.Text), null); MessageBox.Show(enteredText); } private void begininvoke_Click(object sender, RoutedEventArgs e) { string enteredText = ""; txt.Dispatcher.BeginInvoke(new Action(() => enteredText = txt.Text), null); MessageBox.Show(enteredText); }

Patel · Answer

Thanks yiu