EF Core - 使用投影并包含实体的集合

Question

我有一个基本存储库：

public async Task<TEntity> GetByCondition(Expression<Func<TEntity, bool>> predicate, Func<DbSet<TEntity>, IQueryable<TEntity>> baseQuery = null, Expression<Func<TEntity, TEntity>> projection = null)
{
    IQueryable<TEntity> q = _context.Set<TEntity>();

    if (baseQuery != null)
    {
        q = baseQuery(_context.Set<TEntity>());
    }

    q = q.Where(predicate);

    if (projection != null)
    {
        q = q.Select(projection);
    }

    return await q.FirstOrDefaultAsync();
}

我尝试获取业务实体并包含 image.inverseParents 但没有成功：

 Expression<Func<Businesses, bool>> predicate = x => x.Id == id;

            Expression<Func<Businesses, Businesses>> projection = x => new Businesses
            {
                BusinessImages = x.BusinessImages
                                  .Where(bi => bi.Status == (int)EnumGringo.LU_Status.active && bi.Image.Status == (int)EnumGringo.LU_Status.active)
                                  .Select(bi => new BusinessImages
                                  {
                                       //Won't complie
                                      Image = bi.Image.Include(i=>i.InverseParent)
                                  }).ToList()
            };

            Businesses business = await _repository.GetByCondition(predicate, projection: projection);

我怎样才能做这样的事情？
Image = bi.Image.Include(i=>i.InverseParent)

我尝试过的事情：
Image = bi.Image.Select(i=>i.InverseParent.Parent).FirstOrDefault()

添加

IQueryable<Businesses> baseQuery(DbSet<Businesses> x) => x
    .Include(c => c.BusinessImages)
    .ThenInclude(c => c.Image)
    .ThenInclude(c => c.InverseParent);

Businesses business = await _repository.GetByCondition(predicate, projection: projection);

基本存储库忽略基本查询。

Answer 1

投影查询忽略 Include，一旦您使用 Select，您需要继续使用 select。

这对我有用：

 BusinessImages = x.BusinessImages
                                  .Where(bi => bi.Status == (int)EnumGringo.LU_Status.active && bi.Image.Status == (int)EnumGringo.LU_Status.active)
                                  .Select(bi => new BusinessImages
                                  {
                                      Image = new UserImages
                                      {
                                          InverseParent = bi.Image.InverseParent
                                      }
                                  })

EF Core - 使用投影并包含实体的集合

EF Core - use projection and include a collection of an entity

c#

asp.net-core

ef-core-2.2