wpf ObservableCollection填充组合框

Question

How do I fill up my combobox to an item of my ObservableCollectio ?

public ObservableCollection<Contacts> contacts = new ObservableCollection<Contacts>();

Item within Contacts is "Grname". Those items need to be binded to it. Prefer by code, because I want to filter out the duplicates (grouping).

    class Contacts
{
    public string Contact_id { get; set; }
    public string Grname { get; set; }

}

UPDATE:

I found it !

ICollectionView contactsView = CollectionViewSource.GetDefaultView(dataGrid1.ItemsSource);

cmbGroup.ItemsSource = contactsView.Groups;

But how to filter my datagrid with the selected item of combobox ?

I've got:

    void Filter(object sender, FilterEventArgs e)
    {

        if (cmbGroup.ItemsSource == contactsView)
        {
            e.Accepted = true;
        }
        else
        {
    e.Accepted = false;
    }
}

And Filter is binded in CollectionViewSource in my XAML

Answer 1

For filtering, grouping, sorting etc. you could use a CollectionViewSource . That means something like

ICollectionView contactsView = CollectionViewSource.GetDefaultView(contacts);
// For filtering:
contactsView.Filter += sender => {
    // Filter logic here
    return true;
}

Then you bind your combobox against the contactsView.