Possible to extend constructor in partial class? [duplicate]

Question

I'm using an MS Access database (I know...), so to capture the auto-generated primary key, I'm extending the table adapter class. I took me a while to figure this part out, so if that's your problem, future reader, right-click on your dataset file (*.xsd) and select View Code. This will create a partial class. The GetLastID() method is just a query with SELECT @@IDENTITY. The trick is that it has to be done when the row is updated, without closing and opening a new connection, so the RowUpdated event needs to be handled. Here's the code for that:

namespace TimeTrack.TimeTrackDataSetTableAdapters
{
    public partial class TimeSlipsTableAdapter
    {
        public void CustomSetup()
        {
            Adapter.RowUpdated += Adapter_RowUpdated;
        }

        private void Adapter_RowUpdated(object sender, OleDbRowUpdatedEventArgs e)
        {
            if (e.StatementType == StatementType.Insert && e.Errors == null)
            {
                int lastID = (int)GetLastID();
                e.Row["ID"] = lastID;
                e.Status = UpdateStatus.SkipCurrentRow;
            }
        }
    }
}

My question is: Is there are way to avoid having to call the CustomSetup() method?

I would like for somehow to include the event handler assignment in the construction of the table adapter without having to make an additional call. Is there a way?

Is there a default constructor for TimeSlipsTableAdapter defined somewhere else? — D Stanley
– D Stanley, Commented Jun 26, 2021 at 2:52
See also closely related stackoverflow.com/questions/9371200/… (it'd be a duplicate, except it's really more specific to a T4-related scenario) — Peter Duniho
– Peter Duniho, Commented Jun 26, 2021 at 4:57
@DStanley Yes, sorry. The default constructor is in the auto-generated code the DataSet Designer produces. — RobertSF
– RobertSF, Commented Jun 26, 2021 at 14:11

Will Moffat · Accepted Answer · 2021-06-26 02:29:59Z

1

I think you've got the optimal solution here. While you can add new constructors (with different signatures), there's no way in C# for partial classes to add additional steps to a constructor. The only way to do this is with a method.

answered Jun 26, 2021 at 2:29

Will Moffat

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