Dispatcher.BeginInvoke and Dispatcher.Invoke

Naveen Kumar Kaushik

11y15k

Diffrence Between Dispatcher.BeginInvoke and Dispatcher.Invoke In WPF. When do we use both the method with example.

2 Replies

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Upendra Pratap Shahi11y ago
Hello Naveen,

new Thread(foo).Start();
private void foo()
{
this.Dispatcher.BeginInvoke(DispatcherPriority.Normal,
(ThreadStart)delegate()
{
myTextBox.Text = "bing";
Thread.Sleep(TimeSpan.FromSeconds(3));
});
MessageBox.Show("done");
}
If use BeginInvoke, MessageBox pops simultaneous to the text update. If use Invoke, MessageBox pops after the 3 second sleep. Hence, showing the effect of an asynchronous (BeginInvoke) and a synchronous (Invoke) call.

also read below link-

http://tech.pro/tutorial/800/working-with-the-wpf-dispatcher
http://www.shujaat.net/2010/11/wpf-dispatcherinvoke-is-overkill.html
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Shweta Lodha11y ago
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.
A nice sample code is given at: http://tech.pro/tutorial/800/working-with-the-wpf-dispatcher
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