拆分实体框架linq查询会导致包括不起作用

Question

If I do this:

var shipmentQuery = dataAccess.Shipments().Where(x => x.OriginId == originId)
    .Take(100)
    .Include(shipment => shipment.Boxes);

return shipmentQuery;

My box data is included in the result set. But if I do this:

var shipmentQuery = dataAccess.Shipments().Where(x => x.OriginId == originId);

shipmentQuery
    .Take(100)
    .Include(shipment => shipment.Boxes);

Then the box data is not included (boxes is null for every result.)

Are includes supposed to not work if you break up the query?

And, is there anyway to be able to break it up? (I want to add a few conditional where clauses.)

(I am using Entity Framework 6.1.3 connecting to a sql server 2012 database.)

Answer 1

Just put the include statement with the first statement. It won't actually query the db at that point, it's just a query definition, so you don't have to worry about extra records being pulled.

Something like this:

var shipmentQuery = dataAccess.Shipments().Where(x => x.OriginId == originId)
    .Include(shipment => shipment.Boxes);

// Extra query conditions can be applied here

return shipmentQuery.Take(100);