如何将 Collection 中的属性包含在 EntityFramework 核心中

Question

I have this relationship:

public class Company
{
  public virtual ICollection<Employee> Employee { get; set; }
}

Inside of Employee I have a Profile property:

public class Employee
{
    public virtual Profile Profile { get; set; }
}

I'm able to get all the employees but not the Profile property.

And the request:

var result = await Context.Company.Include(a => a.Employee).Where(a => a.Token == Token).SingleOrDefaultAsync();

The result is retrieved but not the Profile.

Answer 1

as @jcruz pointed out ThenInclude in EF Core is what you want:

var result = await Context.Company.Include(a => a.Employee).ThenInclude(e => e.Profile).Where(a => a.Token == Token).SingleOrDefaultAsync();

Answer 2

Change the Include() function to the string overload and include the Profile property.

var result = await Context.Company.Include("Employee.Profile").Where(a => a.Token == Token).SingleOrDefaultAsync();

Answer 3

In addition to ThenInclude, you can write query syntax with join. Sure you should get your lists first; that will be costly. https://docs.microsoft.com/en-us/dotnet/csharp/linq/perform-inner-joins