CODEWITHSUNDEEP
c#wpf
Kuntady Nithesh
Kuntady Nithesh

Reputation: 11721

How to find the parent of the BindingList?

My Model is as below . 

public class FItem
    {
        public FItem()
        {
            FSubsystems = new BindingList<FSubsystem>();            
        }

        public int RecordId { get; set; }
        public string ItemName { get; set; }


        public BindingList<FSubsystem> FSubsystems { get; set; }


    }

    public class FSubsystem
    {
        public int SubSystemID { get; set; }
        public string ItemName { get; set; }
        public int YearID { get; set; }
    }

Code :

FItems = new ObservableCollection<MarketRecord.FItem>();
FItems.CollectionChanged += OnUiCollectionChanged;


        private void OnUiCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            if (e.Action == NotifyCollectionChangedAction.Add)
            {
                var addedItem = e.NewItems[0] as MarketRecord.FItem;
                if (addedItem != null)
                {
                    addedItem.PropertyChanged += OnColumnModified;

                    if (addedItem.RecordId == 0)
                        modifedItems.Add(addedItem);


                    addedItem.FSubsystems.ListChanged += OnColumnModified;

                }
            }
        }






private void OnColumnModified(object sender, EventArgs e)
     {
        if (sender.GetType().Name == "FItem")
        {
            MarketRecord.FItem modifiedItem = (sender as MarketRecord.FItem);
            if (!modifedItems.Contains(modifiedItem))
                modifedItems.Add(modifiedItem);
        }
        else
        {
            // add parent of the binding list (i.e fitem object ) add it to             modifedItems

// Find parent here 
        }

     }

As my code tells I need to find the parent of binding list in else clause of OnColumnModified . How can I do this ?

Upvotes: 0

Views: 101

Answers (1)

Daniel Hilgarth
Daniel Hilgarth

Reputation: 174329

The way you currently structured your code this is not really possible.

You can achieve this with the help of an anonymous method:

addedItem.FSubsystems.ListChanged += (s, e) => OnColumnModified(addedItem, e);

This will register an anonymous method as the event handler for ListChanged. When that event is raised, it discards the sender argument of the event and instead passes in addedItem, your FItem instance.

You could improve the type safety of this code a bit by changing OnColumnModified to this:

private void OnColumnModified(MarketRecord.FItem modifieditem)
{
    if(!modifiedItems.Contains(modifiedItem))
        modifiedItems.Add(modifiedItem);
}

The event registrations would now look like this:

addedItem.PropertyChanged += (s, e) => OnColumnModified(addedItem);

addedItem.FSubsystems.ListChanged += (s, e) => OnColumnModified(addedItem);

Upvotes: 2

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