Update UI from thread in WinRT

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The preferred way to deal with this in WinRT (and C# 5 in general) is to use async–await:

private async void Button_Click(object sender, RoutedEventArgs e)
{
    string text = await Task.Run(() => Compute());
    this.TextBlock.Text = text;
}

Here, the Compute() method will run on a background thread and when it finishes, the rest of the method will execute on the UI thread. In the meantime, the UI thread is free to do whatever it needs (like processing other events).

But if you don’t want to or can’t use async, you can use Dispatcher, in a similar (although different) way as in WPF:

private void Button_Click(object sender, RoutedEventArgs e)
{
    Task.Run(() => Compute());
}

private void Compute()
{
    // perform computation here

    Dispatcher.Invoke(CoreDispatcherPriority.Normal, ShowText, this, resultString);
}

private void ShowText(object sender, InvokedHandlerArgs e)
{
    this.TextBlock.Text = (string)e.Context;
}

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