CODEWITHSUNDEEP
c#wpf
Nickon
Nickon

Reputation: 10156

ListView row numbers without binding

I have always wondered if it's possible in WPF to create a ListView that has row numbers without binding to the IEnumerable<>'s index property? Maybe making a template that autoincrements a row number? How to realise that?

It could be useful in some cases (e.g. when you use an external class that returns tons of data in unpleasant form - like a dictionary or some custom class).

Upvotes: 3

Views: 6053

Answers (1)

David
David

Reputation: 16277

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XAML:

  <ListView.View>
     <GridView>
        <!-- This is the column where the row index is to be shown -->
        <GridViewColumn Width="100" Header="No."
        DisplayMemberBinding="{Binding RelativeSource=
             {RelativeSource FindAncestor, AncestorType={x:Type ListViewItem}}, 
              Converter={StaticResource IndexConverter}}" />
        <!-- other columns, may be bound to your viewmodel instance -->
        <GridViewColumn Width="100"
        ...
        </GridViewColumn>
    </GridView>
  </ListView.View>

Create a converter class:

public class IndexConverter : IValueConverter
{
    public object Convert(object value, Type TargetType, object parameter, CultureInfo culture)
    {
        var item = (ListViewItem) value;
        var listView = ItemsControl.ItemsControlFromItemContainer(item) as ListView;
        int index = listView.ItemContainerGenerator.IndexFromContainer(item) + 1;
        return index.ToString();
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

In window or control's resource section:

<Converter:IndexConverter x:Key="IndexConverter" />

Upvotes: 10

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