Entity Framework Selecting columns from multiple tables (for ThenInclude)? - entity-framework-6

Question

I have question about select...
var applicationUser = unitOfWork.ApplicationUsers.GetAll().Include(i => i.ApplicationUserRoles).ThenInclude(i => i.ApplicationRole)
.Where(i => i.UserName.ToUpper() == userName.ToUpper())
.Select(i => new
{
i.Email,
i.FirstName,
i.LastName,
i.PhoneNumber,
i.ImageUrl,
i.JoinedDate,
i.DateOfBirth,
i.ApplicationUserRoles
})
.FirstOrDefault();
I cant get ApplicationRole how to use it in select ?

Answer 1

If you are using projection with Select you don't need to use Include. Just select the values. To get the Roles via the UserRoles you will need to Select to retrieve those:
var applicationUser = unitOfWork.ApplicationUsers.GetAll()
.Where(i => i.UserName.ToUpper() == userName.ToUpper())
.Select(i => new
{
i.Email,
i.FirstName,
i.LastName,
i.PhoneNumber,
i.ImageUrl,
i.JoinedDate,
i.DateOfBirth,
ApplicationRoles = i.ApplicationUserRoles.Select(x => x.ApplicationRole).ToList()
})
.FirstOrDefault();
You can further refine this by sub-selecting just the role details you need from the application role...
// ...
ApplicationRoles = i.ApplicationUserRoles.Select(x =>
x.ApplicationRole.Select(ar => new { ar.RoleId, ar.RoleName })).ToList()
I recommend using SingleOrDefault rather than FirstOrDefault if you are expecting at most 1 result. First/FirstOrDefault should always be used with an OrderBy/OrderByDescending condition to ensure predictable results.

Answer 2

If I can use for ApplicationRoles, it is working
.Select(i => new
{i.Email,i.FirstName,i.LastName,i.PhoneNumber,i.ImageUrl,i.JoinedDate,i.DateOfBirth,
ApplicationRoles = i.ApplicationUserRoles.Select(x => x.ApplicationRole).ToList(),
})
I cant use for ApplicationUserRoles how is it work for it ?
public class ApplicationUserSummary
{
public DateTime JoinedDate { get; set; }
public string ImageUrl { get; set; }
public string Email { get; set; }
public string PhoneNumber { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime? DateOfBirth { get; set; }
public ICollection<ApplicationRole> ApplicationRoles { get; set; }
public ICollection<ApplicationUserRole> ApplicationUserRoles { get; set; }
}