Question

I have a DataGrid bound to a DomainDataSource:

<sdk:DataGrid AutoGenerateColumns="False" Height="Auto"
     ItemsSource="{Binding ElementName=mailboxDomainDataSource, Path=Data,Mode=TwoWay}"   
     Name="mailboxHeaderDataGrid"....>...</sdk>

I also have an add button to add a new row:

    private void addMailboxButton_Click(object sender, RoutedEventArgs e)
    {
        Mailbox m = new Mailbox();

        InboxNotifierDomainContext context = (InboxNotifierDomainContext)mailboxDomainDataSource.DomainContext;
        ((InboxNotifierDomainContext)mailboxDomainDataSource.DomainContext).Mailboxes.Add(m);
        if (!mailboxDomainDataSource.DomainContext.IsSubmitting) if (mailboxDomainDataSource.HasChanges) mailboxDomainDataSource.SubmitChanges();
        mailboxHeaderDataGrid.ItemsSource = ((InboxNotifierDomainContext)mailboxDomainDataSource.DomainContext).Mailboxes;

        foreach (Mailbox m1 in ((InboxNotifierDomainContext)mailboxDomainDataSource.DomainContext).Mailboxes)
        {
            MessageBox.Show(m1.MailboxID + '-' + m1.MailBox1);
        }
    }

Now, when I iterate through DomainContext.Mailboxes, as at the end of the function, the new mailbox exists.

When I look in my database, the new mailbox exists.

If I refresh the page, the new mailbox appears in the DataGrid.

However, when I iterate through the ItemsSource, the new mailbox doesn’t appear (shouldn’t it be the same as DomainContext.Mailboxes, since I set them equal?). And the new mailbox doesn’t appear in the grid.

Any help would be wonderful.

Thanks in advance!

Answer 1

My favourite way to do this is as follows:

InboxNotifierDomainContext _context = mailboxDomainDataSource.DomainContext as InboxNotifierDomainContext;

_context.EntityContainer.GetEntitySet<Mailbox>().EntityAdded += (s,e) => {mailBoxGrid.ItemsSource = mailboxDomainDataSource.DomainContext.EntityContainer.GetEntitySet<Mailbox>();};

Alternatively, you can use the event args to get the added entity, cast it as a mailbox and and it to the ItemsSource–this was just the lazy way.

Might as well take advantage of C# being event-driven!