仅选择具有多个包含的 mvc linq 查询中的某些字段

Question

When looking at generated json,I saw that a rules page was including image data. I traced it to this code: `

.Include(m => m.OrderRuleType)
            .Include(m => m.OrderRuleType.Type)
            .Include(m => m.OrderRuleType.Category)
            // best match fields
            .Include(m => m.TicketType)
            .Include(m => m.DestTicketType)
            .Include(m => m.Shipper)
            .Include(m => m.CarrierType)
            .Include(m => m.Carrier)
            .Include(m => m.DriverGroup)
            .Include(m => m.Driver)
            .Include(m => m.TruckType)
            .Include(m => m.ProductGroup)
            .Include(m => m.Destination)
            .Include(m => m.Origin)
            .Include(m => m.DestState)
            .Include(m => m.OriginState)
            .Include(m => m.DestRegion)
            .Include(m => m.OriginRegion)
            .Include(m => m.Producer)
        .Where(m => !m.OrderRuleType.Hidden)
        .Where(m => m.ID == id || id == 0)

I tried doing a .select on the offending include (shipper) like this:

.Select(m => new { m.ID, m.Name}})

that caused a red line for all code after it. I tried putting an .asEnumerable() on it as well.

What is the proper way to select just multiple fields from these? Pretty much all of them we are only using the ID and name field from that table.

I could probably do a .select at the very end, but i do not know if it's possible to select out values like that without creating a view model. I tried adding a select after the shipper include but it broke all following includes.

Answer 1

I solved this by using an anonymous select. I was not able to select directly into the model for two reasons: 1. Some of the fields (all the named ones) were notmapped fields without setters, and 2. The model was bound to a table. Here is working code:

var data = db.OrderRules
                        .Include(m => m.OrderRuleType)
                        .Include(m => m.OrderRuleType.Type)
                        .Include(m => m.OrderRuleType.Category)
                        // best match fields
                        .Include(m => m.TicketType)
                        .Include(m => m.DestTicketType)
                        .Include(m => m.Shipper)
                        .Include(m => m.CarrierType)
                        .Include(m => m.Carrier)
                        .Include(m => m.DriverGroup)
                        .Include(m => m.Driver)
                        .Include(m => m.TruckType)
                        .Include(m => m.ProductGroup)
                        .Include(m => m.Destination)
                        .Include(m => m.Origin)
                        .Include(m => m.DestState)
                        .Include(m => m.OriginState)
                        .Include(m => m.DestRegion)
                        .Include(m => m.OriginRegion)
                        .Include(m => m.Producer)
                    .Where(m => !m.OrderRuleType.Hidden)
                    .Where(m => m.ID == id || id == 0)
                    .Select(m => new { 
                        m.ID,
                        allowRowDeactivate = true,
                        allowRowEdit = true,
                        m.EffectiveDate,
                        m.EndDate,
                        m.Value,
                        m.TypeID,
                        m.OrderRuleType,
                        m.OrderRuleType.Type,
                        m.OrderRuleType.Category,
                        OriginTicketTypeName = m.TicketType.Name ?? BestMatchCore.DEFAULT_LABEL,
                        DestTicketTypeName = m.DestTicketType.Name ?? BestMatchCore.DEFAULT_LABEL,
                        ShipperName = m.Shipper.Name ?? BestMatchCore.DEFAULT_LABEL,
                        CarrierTypeName = m.CarrierType.Name ?? BestMatchCore.DEFAULT_LABEL,
                        CarrierName = m.Carrier.Name ?? BestMatchCore.DEFAULT_LABEL,
                        DriverGroupName = m.DriverGroup.Name ?? BestMatchCore.DEFAULT_LABEL,
                        DriverName = (m.Driver.FirstName + " " + m.Driver.LastName == " ")? BestMatchCore.DEFAULT_LABEL: m.Driver.FirstName + " " + m.Driver.LastName,
                        TruckTypeName = m.TruckType.Name ?? BestMatchCore.DEFAULT_LABEL,
                        ProductGroupName = m.ProductGroup.Name ?? BestMatchCore.DEFAULT_LABEL,
                        DestinationName = m.Destination.Name ?? BestMatchCore.DEFAULT_LABEL,
                        OriginName = m.Origin.Name ?? BestMatchCore.DEFAULT_LABEL,
                        DestStateName = m.DestState.Abbreviation ?? BestMatchCore.DEFAULT_LABEL,
                        OriginStateName = m.OriginState.Abbreviation ?? BestMatchCore.DEFAULT_LABEL,
                        DestRegionName = m.DestRegion.Name ?? BestMatchCore.DEFAULT_LABEL,
                        OriginRegionName = m.OriginRegion.Name ?? BestMatchCore.DEFAULT_LABEL,
                        ProducerName = m.Producer.Name ?? BestMatchCore.DEFAULT_LABEL,
                        CreateDate = m.CreateDateUTC,
                        m.CreatedByUser,
                        LastChangeDate = m.LastChangeDateUTC,
                        m.LastChangedByUser

                        });

This created a query that only brought back the fields i wanted.