将表实体与视图实体合并的最佳实践

Question

Is there any better way to merge a Entity Table with a Entity View

A little example: I have a Person table with:

id ,

name ,

lastname

columns and a view named ViewPersonLastLocations with:

person_id

location_name .

I need to display Person table with the information of ViewPersonLastLocations . Actually i can "merge" those entities with two foreachs, and i create a variable in the Person partial class .

Is there any other way to do this?

Answer 1

I am a little unclear on what you want based on your last comment, but will start with this code for a join if the relationship is 1:1. If it is 1:Many, then it is similar, but project into a collection.

var personWithLocation = context.Persons
        .SelectMany(p => context.ViewPersonLastLocations
                                .Where(vp => vp.person_id == p.id)
                                .DefaultIfEmpty(),
                         (p, vp) => new PersonViewModel  // create a viewmodel for results or anonymous
                         {
                             Id = p.id,
                             Name = p.name,
                             LastName = p.lastname,
                             LocationName = vp.location_name
                         }
                     ).ToList();