DataSource reflected after maximizing the window in wpf

Question

Hey,

This is really peculiar. I tried a simple data binding example program. I tried to bind a collection (IList) to a list box. When i alter the collection, the list box is updated only if i maximize the window. Here are the snippets,

<ListBox x:Name="myBirthdaysListBox" ItemsSource="{Binding}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <UniformGrid>
                <Label Content="{Binding Name}"></Label>
                <Label Content="{Binding DateOfBirth}"></Label>
            </UniformGrid>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

public Window1()
{
    InitializeComponent();
    myCalendar = new List<Calendar>();
    myBirthdaysListBox.DataContext = myCalendar;
}

I am just a beginner in wpf. Kindly let me know, if i have done some thing terribly wrong in here.

Answer 1

Try using a BindingList<Calendar> rather than just a List<Calendar>, As binding list raises events for when items get added/removed/etc.

What you're seeing is the control is redrawing when you resize, and it's going through all the data again.

Off the top of my head, I believe you need to implement INotifyPropertyChanged on your Calendar such that the binding list is notified if an item in it changes