Linq Includes Alternative

问题

I am a loading a entity from the database like so

    var profileEntity = await Context.Profiles
                                     .Include(x => x.MedicalRecords)
                                     .Include(x => x.DrugHistory)
                                     .Include(x => x.EmploymentStatus)
                                     .SingleOrDefaultAsync(x => x.Id == id);

All is working fine, I was just wondering if there is a better way to include its non generic type properties rather using the Include method because this particular entity has a lot of properties I need to include

回答1:

It is not possible to automatically eagerly load those properties (Mechanism for statically defining eager loading for navigation properties), but you can create a reusable extension method for this purpose:

public static IQueryable<Profile> IncludeAll(this IQueryable<Profile> query)
{
     return query.Include(x => x.MedicalRecords)
                 .Include(x => x.DrugHistory)
                 .Include(x => x.EmploymentStatus);
}

Which can be used in a following way:

var profileEntity = Context.Profiles.IncludeAll().SingleOrDefault(x => x.Id == id);

回答2:

One option is to consider turning off lazy loading for those particular navigation properties by making them not virtual. Example below from the MSDN page.

public class Blog 
{  
    public int BlogId { get; set; }  
    public string Name { get; set; }  
    public string Url { get; set; }  
    public string Tags { get; set; }  

    public ICollection<Post> Posts { get; set; }  
}

See the section titled Turning off lazy loading for specific navigation properties at this link for reference.

来源：https://stackoverflow.com/questions/48566437/linq-includes-alternative

标签

linq