WCF call blocks UI

Asked Sep 23 '14 at 15:29

Active Sep 23 '14 at 15:38

Viewed 237 times

I've setup a DispatcherTimer that calls a WCF service on each tick event. After the service is called I'd like to update the UI without blocking it, so I've marked both the event handler for the timer and the method that makes the WCF call as async and included await commands in the relevant places (see code below). However, the UI is still getting blocked. Any ideas?

    static async void connectivityTimer_Tick(object sender, EventArgs e)
    {
        Person person = await ServiceClient.GetPersonAsync();

        lblText.Text = person.Name;
    }

    public static async Task<Person> GetPersonAsync()
    {
         Service.Client client = new Service.Client();

         Task<string> serviceResult = client.GetPersonAsync();

         string contentResults = await serviceResult;

         XmlSerializer serializer = new XmlSerializer(typeof(PersonContainer));

         using (TextReader reader = new StringReader(contentResults))
         {
                return ((PersonContainer)serializer.Deserialize(reader)).Person;
         }
    }

edited Sep 23 '14 at 15:38

asked Sep 23 '14 at 15:29

Gonzalo

Thank you for the comment John. I have exception handling code in that method, i removed it form my post for simplicity. – Gonzalo Sep 23 '14 at 15:35
Done, try/catch blocks removed – Gonzalo Sep 23 '14 at 15:39
Thanks. In general, keep irrelevant code out of the question - we tend to think that whatever is in the question is relevant. – John Saunders Sep 23 '14 at 15:44
You should use System.Timer instead of DispatcherTimer: http://stackoverflow.com/questions/1111645/comparing-timer-with-dispatchertimer – Matt Sep 23 '14 at 16:13
How often is the Tick event fired? – Patrice Gahide Sep 23 '14 at 16:48
@Matt Why would he do that? He updates a label in the Tick event. – Patrice Gahide Sep 23 '14 at 16:48
It's configurable, but right now it fires every 30 seconds – Gonzalo Sep 23 '14 at 17:13
1

How about `Dispatcher.CurrentDispatcher.BeginInvoke((Action) (()=> lblText.Text = person.Name))`? – XAMlMAX Sep 23 '14 at 19:14

WCF call blocks UI

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