Binding to sub objects using cell template

[Bartłomiej Tyla]

Hello

I'm developing silverlight application using wcf data service and radgridview. From wcf dataservice I get collection of objects TimesheetWeekSummary. 

[DataContract]
  public class TimesheetWeekSummary
  {
      [DataMember]
      public WorkingDay[] WorkingDays;

      // other properties

      [DataContract]
      public class WorkingDay
      {
          [DataMember]
          public DateTime Date { get; set; }
          [DataMember]
          public decimal? Hours { get; set; }
          [DataMember]
          public bool IsApproved { get; set; }
      }
  }

Now I want to bind each object of WorkingDays array to different RadGridView columns, corresponding to each day of the week (WorkingDays contains 7 elements). Fyi I'm creating columns dynamically. In each cell I want to display Date in one line and Hours in another. I've written a template to do so:

<DataTemplate x:Name="DayCellTemplate" x:Key="DayCell">
    <StackPanel Orientation="Vertical">
        <TextBlock Text="{Binding Date, StringFormat='yyyy/MM/dd' }" />
        <TextBlock Text="{Binding Hours}" />
    </StackPanel>
</DataTemplate>

And here is example of how the columns are created:

WorkingDayConverter converter = new WorkingDayConverter();
radGridView.Columns.Add(new GridViewDataColumn()
{
    UniqueName = Columns.Monday.ToString(),
    Header = columnHeaders[Columns.Monday],
    DataMemberBinding = new System.Windows.Data.Binding() { Converter = converter, ConverterParameter = (int)DayOfWeek.Monday },
    CellTemplate = (DataTemplate)LayoutRoot.Resources["DayCell"],
    Width = 100,
    IsResizable = false,
    IsReadOnly = true
});

Converter code seems fine:

public class WorkingDayConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        int param = (int)parameter;
        if (value == null || param < 0 || param > 6)
            return null;

        TimesheetWeekSummary weekSummary = (TimesheetWeekSummary)value;
        return weekSummary.WorkingDays[param];
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null;
    }
}

This solution is unfortunately not working, grid cells are empty and the object binded to the data template is TimesheetWeekSummary (I can display it's properties if I change the template).

Any help would be greatly appreciated. 

[Pavel Pavlov]

Hello,

The data context of inside the cell would be your TimeSheetWeekSummary , so the correct binding should point to the nested property ... something like :

<TextBlock Text="{Binding WorkingDay.Hours}" />  rather than "{Binding Hours}"
Regards,
Pavel Pavlov
the Telerik team

[Bartłomiej Tyla]

Yes, but that's why I'm using the converter. I think I didn't explain it properly. I'd like the converter to bind the correct WorkingDay on a fly. I'm passing a parameter to the converter ((int)DayOfWeek.Monday for instance) and it does return correct WorkingDay, but the data context of the cell template is still the TimesheetWeekSummary, just as you said.