Help with Entity Query

I can't seem to figure out how to write this query properly. I've tried various combinations but nothing's worked yet.

Below is the relevant portion of my database model:

I need to select the products that match a given Category and Group, and that match a given Year, Make, Model, submodel. This I've done below:

 ItemList = From P In gDataContext.Products.Include("Groups").Include("Groups.Category1").Include("LookupYearMakeModels") From G In P.Groups Where G.Category = Cat And G.Grp = Group  From Y In P.LookupYearMakeModels Where Y.Year = YMM.Year And Y.Make = YMM.Make And Y.Model = YMM.Model And Y.Submodel =开发者_Python百科 YMM.Submodel Select P

I now also have to select products that match the Category, and Group but are Universal (Product.Univeral = True).

I'm currently writing two queries, the one above and the one below. I'm merging the results of the two by simply using ItemList.AddRange(ItemList2)

ItemList2 = From P In gDataContext.Products.Include("Groups").Include("Groups.Category1") where P.Universal From G In P.Groups Where G.Category = Cat And G.Grp = Group  Select P

But I want to combine both queries into one and avoid merging the results. How can I do it?

Thanks for your help!

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I tried to set up a similar model, and I believe this works. Here I am selecting products that have a group matching the given category and group and that have a matching year/make/model/submodel or are universal.

ItemList = From P In gDataContext.Products.Include("Groups").Include("Groups.Category1").Include("LookupYearMakeModels") 
           Where P.Groups.Any(Function(G) G.Category = Cat And G.Grp = Group) _
                And ( _
                        P.LookupYearMakeModels.Any(Function(Y) Y.Year = YMM.Year And Y.Make = YMM.Make And Y.Model = YMM.Model And Y.Submodel = YMM.Submodel) _
                        Or _
                        P.Universal = True _
                    )
           Select P

HTH

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You can use IQueryable.Union Method:

ItemList = (From P In gDataContext.Products                                 
                                  .Include("Groups.Category1")
                                  .Include("LookupYearMakeModels") 
            From G In P.Groups 
                Where G.Category = Cat And G.Grp = Group  
            From Y In P.LookupYearMakeModels 
                Where Y.Year = YMM.Year 
                     And Y.Make = YMM.Make And Y.Model = YMM.Model 
                     And Y.Submodel = YMM.Submodel 
            Select P)
            .Union(
            From P In gDataContext.Products                     
                                  .Include("Groups.Category1")
            Where P.Universal
            From G In P.Groups Where G.Category = Cat And G.Grp = Group
            Select P)