Question

I have a partial class to extend one of my LinqToSql classes. In this partial class I have the following calculated field.

    public bool IsInCluster
    {
        get
        {
            return Cluster != null;
        }
    }

In order for a grid column databound to this field to update automatically I have implemented the following partial method.

    partial void OnClusterIDChanged()
    {
        SendPropertyChanged("IsInCluster");
    }

However when I update the Cluster property as shown in the following code the OnClusterIDChanged method does not get called:

private void ExecCreateClusterCommand()
{

        var cluster = new Cluster()
        {
            ID = Guid.NewGuid(),
            MailService = AppState.CurrentMailService
        };

        App.DataContext.Clusters.InsertOnSubmit(cluster);

        foreach (DeliveryPoint deliveryPoint in SelectedDeliveryPoints)
        {
            deliveryPoint.Cluster = cluster;
        }

        App.DataContext.SubmitChanges();      

}

I have successfully used this technique with other non navigation properties related to calculated fields. Is there a way to make this work?

Answer 1

The only solution I could find for this was to create a public method in the DeliveryPoint class enabling me to call SendPropertyChanged for the required field (navigation property):

        public void CallSendPropertyChanged(string propertyName)
        {
            SendPropertyChanged(propertyName);
        }