Question

I have two tables I am using to fill a gridview. The tables have a common field named RangeActivityID. My problem is that the database is very old and some of the older entries do not match up IDs between tables, so I am unable to add an association between them in the database.

I do not care about the old data which doesn’t match up, so in my .dbml file, I manually created an association in order to select good data from both tables. This is the LINQ query I have:

var collective = from p in rangeConnection.RangeActivities
                            orderby p.RangeActivityID
                            select new
                            {
                                TestName = p.TestName,
                                DateTime = p.ActivityDateTime,
                                Notes = p.Notes,
                                //RoundSerialNumber = p.RoundFire.RoundSerialNumber,
                                //RoundType = p.RoundFire.RoundType,
                                //LotStockNumber = p.RoundFire.LotNumber
                            };

I can set my grid datasource to ‘collective’ and everything works, but if I uncomment the three commented lines, the query returns no results because the tables have data that doesn’t meet the association criteria. Is there a way to have the LINQ query ignore results that do not match up?

Thanks in advance!

Answer 1

Try to add where p.RoundFire != null criteria.