How to avoid "source !=null" when using Code Contracts and Linq To Sql?
- by Florian
I have the following code using a normal data context which works great:
var dc = new myDataContext();
Contract.Assume(dc.Cars!= null);
var cars = (from c in dc.Cars
where c.Owner = 'Jim'
select c).ToList();
However when I convert the filter to an extension method like this:
var dc = new myDataContext();
Contract.Assume(dc.Cars!= null);
var cars = dc.Cars.WithOwner('Jim');
public static IQueryable<Car> WithOwner(IQueryable<Car> cars, string owner)
{
Contract.Requires(cars != null);
return cars.Where(c => c.Owner = owner);
}
I get the following warning:
warning : CodeContracts: requires unproven: source != null
