Question

I parse an xml results from a webservice using linq :

XElement items = XElement.Parse(e.Result);
MyListBox.ItemsSource = from item in items.Descendants("node")
            select new MyViewModel
            {
               ...
            };

This automatically populate my ListBox. But the problem is, I usually access my ObservableCollection like this :

App.MyViewModel.MyItems;

having in my xaml :

ItemsSource="{Binding MyItems,}"

How can I modify directly my ObservableCollection ? I read Cast LINQ result to ObservableCollection
and tried this :

var v = from item in items.Descendants("node")
            select new MyViewModel
            {
               ...
            };
OApp.MyViewModel.MyItems = new ObservableCollection<MyViewModel>(v);

But I can’t since this in WP7 (Silverlight 3), and there is no constructor like this

Thanks !

Answer 1

I’d just invent a static method like this:-

public static ObservableCollection<T> CreateObservableCollect<T>(IEnumerable<T> range)
{
    var result = new ObservableCollection<T>();
    foreach (T item in range)
    {
        result.Add(item);
    }
    return result;
}

Now your last line of code becomes:-

 OApp.MyViewModel.MyItems = new CreateObservableCollection<MyViewModel>(v);