yet another wpf listbox refresh - wpf

Question

As I am new to wpf i am loosing myself in the webpages about similar topic. I hope somebody could help me explain some basic stuff that I could not manage to understand.
I have a wpf application connected over a websocket to the server. The server returns me every 5 seconds a List. Every new list has nothing to do with the old one. When i get the new list, the old one is not important anymore. The only property of a Player (in the list) that interests me in his ID.
Somehow I need to refresh or update the listbox. I used the observable collection in this way:
private static ObservableCollection<Player> sample;
private static List<Player> sample2 = new List<Player>();
public List<Player> update
{
set
{
sample2 = value;
sample = new ObservableCollection<Player>((List<Player>) sample2);
onPropertyChanged(sample, "ID");
}
}
private void onPropertyChanged(object sender, string propertyName)
{
if (this.PropertyChanged != null)
PropertyChanged(sender, new PropertyChangedEventArgs(propertyName));
}
When debugging the propertychanged is always null. Im really lost here how to update the listbox.
The xaml of the listbox goes like this:
<DataTemplate x:Key="PlayerTemplate">
<WrapPanel>
<Grid >
<Grid.ColumnDefinitions x:Uid="5">
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<TextBlock VerticalAlignment="Center" Margin="5" Grid.Column="0" Text="{Binding Path=ID}" FontSize="22" FontWeight="Bold"/>
</Grid>
</WrapPanel>

Answer 1

sample doesn't have a property called "ID" because sample is your collection, not your Player instance. Moreover, since you are completely replacing the collection, there is no point using an observable one. Try this:
private ICollection<Player> players = new List<Player>();
public ICollection<Player> Players
{
get { return this.players; }
private set
{
this.players = value;
// the collection instance itself has changed (along with the players in it), so we just need to invalidate this property
this.OnPropertyChanged(this, "Players");
}
}