Task action error

Question

Here is my code

Action<object> action = (object obj) =>// update currency
            {
                prLoading.Visibility = Visibility.Collapsed;

            };

            Task ct = new Task(action, "UpdateData");
            ct.Start();

The prLoading is a ProgressRing, when I debug the code it's always popup error: "The application called an interface that was marshalled for a different thread." in line "prLoading.Visibility = Visibility.Collapsed;"

It seems it's not allowed to operate in different thread.

Is there any other way to solve this issue, I just want when app updating data, the ProgressRing could be appear.

Thanks

Answer 1

You must only access UI elements on the UI thread so you need to use the Dispatcher here:

Action<object> action = async (object obj) =>// update currency
            {
                await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
                        () =>
                        {
                            prLoading.Visibility = Visibility.Collapsed;
                        });

            };

            Task ct = new Task(action, "UpdateData");
            ct.Start();

Answer 2

Awesome, thanks.