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Binding to a collection which holds multiple other collections
posted

I have a xamdatagrid binding to a collection of “Nodes”. Here are my custom classes

    public class Node

    {

        string name = string.Empty;

        public string Name { get; set; }
 

        ObservableCollection<Node> child = new ObservableCollection<Node>();

        public ObservableCollection<Node> Child

        {

            get

            {

                if (child == null) child = new ObservableCollection<Node>();

                return child;

            }

            set { child = value; }

        }

 

        ObservableCollection<Forecast> forecasts = new ObservableCollection<Forecast>();

        public ObservableCollection<Forecast> Forecasts

        {

            get { return forecasts; }

            set { forecasts = value; }

        }

    }

 

    public class Forecast
    {
        public string Name { get; set; }
        public List<Load> Loads { get; set; }
    }
 
    public class Load
    {
        public string Name { get; set; }
        public int Value { get; set; }
    }

I would like to bind my grid to a collection of Nodes. I have to generate my fields dynamically. I first create a field for my Node and Child. Then once I try to expand a child that doesn’t have any other children I would like to display the values in my forecasts collection.

        private void xamDataGrid_RecordExpanding(object sender, Infragistics.Windows.DataPresenter.Events.RecordExpandingEventArgs e)
        {
            if (e.Record.HasChildren == false)
            {
                Field forecast = new Field();
                forecast.Name = "Forecasts";
                forecast.Label = "Region";     
                e.Record.FieldLayout.Fields.Add(forecast);   
            }
        }

When I do this I get 2 blank rows with just the names of the Child field and Forecasts field. If I expand the Forecasts row I can then see the values in my forecasts collection.

Is there a way to display the Forecasts values automatically and not display the Child Field name? I tried to remove the Child field but if I do that I lose all child fields in the grid and can only see my top level node…

Thanks

Parents
  • 28407
    posted

    HI,

     Maybe the best thing to do is to show the forecast colleciton when the child collection has no items in it.

     I am attaching a sample, which hides the forecast colleciton if the child collection has data and shows the forecast colleciton when the child colleciton has no data.

     Please review my sample.

    Sincerely,

     Matt

     Developer Support Engineer

     

    WpfApplication149.zip
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