BindingListView / Discussion / Help: Adding custom business object to DataGridView

Hi,

I have been using this library for sometime now and it has been extremely useful. Recently, I have made a DataGridView that I can add, edit, and delete objects the default way (in grid CRUD.) The DataGridView is hooked up to a BindingSource with its DataSource property set to a BindingListView with a BindingList of my custom object. The problem I am having is that I have a property in my custom business object that uses the value of another property in the object, i.e.:

public int Amount
{
    get
    {
        return this._amount;
    }
    set
    {
        if (this._amount!= value)
        {
            this._amount = value;
            this.OnPropertyChanged("Amount");
            this.OnPropertyChanged("Amount10";
        }
    }
}

public int Amount10
{
    get
    {
        return this._amount * 10;
    }
}

I data bind the DataGridView through the Windows Forms Designer and set the DataSource of the BindingSource to a BindingListView with the source data source. I am implementing the INotifyPropertyChanged interface in this class. While I add a new row to the DataGridView (by entering data on the "new row" in the DataGridView), the Amount10 column doesn't update as I would expect after entering data for the Amount column. The current data for Amount10 only appears if I focus on the Amount10 cell, focus off the row I added and back to it, or I add another new item through the grid. When I stepped through the code (using Visual Studio 2008) I found that this call in AggregateBindingListView.ItemPropertyChanged (line 760):

int index = _sourceIndices.IndexOfItem((T)sender);

always returns -1 because the sender is the new row and hasn't been committed to the object data source. The subsequent code:

if (index > -1)
{
    // Tell listeners that an item has changed.
    // This is inline with the IRaiseItemChangedEvents implementation.
    OnListChanged(ListChangedType.ItemChanged, index);
}

obviously doesn't run and won't update the DataGridView with the correct value for the Amount10 column.

I apologize that this was long-winded, but it was an issue I would point out. Again, thank you for a great library that has saved me plenty of time not implementing something like this over and over again.

Corey Sullivan

Adding custom business object to DataGridView

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Adding custom business object to DataGridView