How to use BeginInvoke method correctly?

Question

I have got this code. It works but it freezes the UI. What I want to know is how to use WPF BeginInvok method corectly?

private void ValidateAuthURL_Click(object sender, RoutedEventArgs e)
{
    ((Button)sender).Dispatcher.BeginInvoke(DispatcherPriority.Input, 
        new ThreadStart(() =>
        {
            bool result = false;
            try
            {

From the example you've posted, you're using it right. However what code is called within the Lambda function? It is possible you have re-entrancy and/or a deadlock - are you using other threads? What is the CPU usage like when frozen. Maximum or zero? — Dr. Andrew Burnett-Thompson
– Dr. Andrew Burnett-Thompson, Commented Jan 25, 2012 at 11:36
@Dr. Andrew Burnett-Thompson I just use var request = WebRequest.Create(serviceUrl) as HttpWebRequest; and etc... — NoWar
– NoWar, Commented Jan 25, 2012 at 11:54

Jon Skeet · Accepted Answer · 2012-01-25 11:38:16Z

3

Your delegate is going to be executed in the UI thread. That's what Dispatcher.BeginInvoke is there for. I assume you really want to execute that delegate in a background thread... then you should use Dispatcher.BeginInvoke to get back to the UI thread in order to update the UI later.

In terms of getting to a background thread, you could:

Use the thread pool directly (ThreadPool.QueueUserWorkItem)
Use BackgroundWorker
Start a new thread
Use Task.Factory.StartNew (if you're using .NET 4)

answered Jan 25, 2012 at 11:38

Jon Skeet

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