How to bind List<object> dynamically to a DataGrid in WPF?

Question

i want to bind list to a datagrid dynamically, following code works for first time, if click add again it is not getting populated in the data grid.

screenshot

       private List<Item> PopulateItemList()
    {
        return itemLst;
    }
    private void btnAdd_Click(object sender, RoutedEventArgs e)
    {
        Item item = new Item();
        item.Item1 = txtItem.Text;
        itemLst.Add(item);
        grdItem.ItemsSource = PopulateItemList();

    }
    private List<Item> itemLst = new List<Item>();

    private void Page_Loaded(object sender, RoutedEventArgs e)
    {
        itemLst.Clear(); 

    }

Thanks.

+1 for a good screenshot and a code sample that contains exactly the relevant parts. — Heinzi
– Heinzi, Commented Oct 5, 2011 at 17:19

SLaks · Accepted Answer · 2011-10-05 17:17:44Z

5

You should use an ObservableCollection<T> instead of List<T>.

ObservableCollection<T> implements INotifyCollectionChanged, which will tell WPF when you add or remove items.

answered Oct 5, 2011 at 17:17

SLaks

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2 Comments

SQLMason Over a year ago

I was going to type a very similar response.

Philippe Lavoie Over a year ago

In addition : The ObservableCollection<T> notify for list change (Add, Remove, Move) but not for T change. You need T to implement INotifyPropertyChanged for that.

Rohit Vats · Accepted Answer · 2011-10-05 17:33:38Z

1

Either you should use ObservableCollection as suggested by Slaks. Otherwise you have to set the datatgrid itemSource null first before populating it again to some other value. But i would strongly suggest you to use ObservableCollection and you can set it to datagrid's ItemSource in the UserControl's constructor instead of setting it again.

answered Oct 5, 2011 at 17:33

Rohit Vats

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