Question

I am working on a WPF application. For some reason, the values in my view model are not showing

MyViewModel.cs

public class MyViewModel : ViewModel
{
  private ObservableCollection<Item> items = Item.GetAll();
  public ObservableCollection<Item> Items
  {
    get { return items; }
    set { items = value; }
  }
}

public class Item
{
  public int ID { get; set; }

  public List<int> Tally = new List<int>();

  public int Total { get; set; }

  public Item(int id)
  {
    this.ID = id;
    for (int i = 0; i < 7; i++)
      this.Tally.Add(0);
  }

  public static ObservableCollection<Item> GetAll()
  {
    ObservableCollection<Item> items = new ObservableCollection<Item>();
    for (int i = 0; i <= 10; i++)
    {
      items.Add(new Item(i));
    }
    return items;
  }
}

MyPage.xaml

<telerik:RadGridView x:Name="myGridView" Grid.Row="1" AutoGenerateColumns="False" 
  ItemsSource="{Binding Path=Items}">
  <telerik:RadGridView.Columns>
    <telerik:GridViewDataColumn Header="ID" DataMemberBinding="{Binding Path=ID}" IsReadOnly="True" />
    <telerik:GridViewDataColumn Header="Monday" DataMemberBinding="{Binding Path=Tally[0], Mode=OneWay}" IsReadOnly="True" Width="1*" />
    <telerik:GridViewDataColumn Header="Tuesday" DataMemberBinding="{Binding Path=Tally[1], Mode=OneWay}" IsReadOnly="True" Width="1*" />
    <telerik:GridViewDataColumn Header="Wednesday" DataMemberBinding="{Binding Path=Tally[2], Mode=OneWay}" IsReadOnly="True" Width="1*" />
    <telerik:GridViewDataColumn Header="Thursday" DataMemberBinding="{Binding Path=Tally[3], Mode=OneWay}" IsReadOnly="True" Width="1*" />
    <telerik:GridViewDataColumn Header="Friday" DataMemberBinding="{Binding Path=Tally[4], Mode=OneWay}" IsReadOnly="True" Width="1*" />
    <telerik:GridViewDataColumn Header="Total" DataMemberBinding="{Binding Path=Total, Mode=OneWay}" />
  </telerik:RadGridView.Columns>
</telerik:RadGridView>

An entry for each Item appears in the grid as expected. However, only the first and last columns have values. The values in the Monday-Friday columns (the columns that reference the Tally List) are not appearing. I’m not sure what I’m doing wrong. Can somebody please tell me?

Thank you!

Answer 1

Tally is a field, needs to be a public property.

(I also hope that you are aware of INPC if you want to make runtime changes)