Windows Phone 8绑定

Question

I have a Windows Phone 8 Pivot application which contains the auto generated MainViewModel Binding mechanism.

I have changed the MainViewModel class to suit my needs and changed the MainPage.xaml markup so that it binds to the correct properties.

All good.

Now - I have a class which calls a Web Service and a call-back method which fires when data is received:

private void GetSigns_Completed(object sender, OpenReadCompletedEventArgs e)
{
    using (var sr = new StreamReader(e.Result))
    {
        var data = sr.ReadToEnd();
        var result = JsonConvert.DeserializeObject<SignViewModel>(data);
    }
}

As you can see, I am not returning or populating anything with the result object as I do not know how to do so. The MainViewModel 's properties have private setters :

public ObservableCollection<SignViewModel> Signs { get; private set; }
public ObservableCollection<TweetsViewModel> Tweets { get; private set; }

Each of these objects have a NotifyPropertyChange event.

So how do I populate the Signs and Tweets objects and make the whole binding work automatically when retrieving data from a Web Service? How do I make the UI/Mainpage.xaml communicate with the Web Service Class and the MainViewModel class?

Answer 1

To solve the issue, I simply changed the setters to public for Signs and Tweets . Once this was in place, the NotifyPropertyChange worked it's magic and automatically bound to the View. Magic! I wonder why Microsoft Developers made the setters private .....