Question

I’m trying to implement change notification on the RowState property of a DataRow object.

Here’s what I have so far, but my SetModified method never gets called:

internal class DataRowEx : DataRow, INotifyPropertyChanged
{
    #region Events
    public event PropertyChangedEventHandler PropertyChanged;
    #endregion

    #region Construction
    public DataRowEx(DataRowBuilder builder)
        : base(builder)
    { }
    #endregion

    #region Overrides
    protected new void SetModified()
    {
        base.SetModified();
        PropertyChanged(this, new PropertyChangedEventArgs("RowState"));
    }
    #endregion
}

I suppose I could make it internal and call it myself from the object containing the row, but I feel like there should be a better way.

Answer 1

The DataTable works with DataRow and, as such, will never call your SetModified() in DataRowEx (it “hides” the inherited member, it doesn’t override it).

Probably the easiest way of achieving what you want is to also implement a custom DataTable, override either OnRowChanging() or OnRowChanged(), and delegate to custom functionality in your DataRowEx from there.