在EF Core中的何处包含/然后包含

Question

我需要在ThenInclude中使用where

        var templatesFields = await _context.Sections
        .Include(x => x.Subtitles)
        .ThenInclude(r => r.Fields.Where(t=>t.TemplatesFields.TemplateID==TemplateID))
        .ThenInclude(r => r.OptionSources)
        .ThenInclude(r => r.OptionsSourcesDetails)
        .ToListAsync();

Answer 1

您不能使用Include或ThenInclude中的where条件。您可以做的是：

var templatesFields = await _context.Sections
    .Include(x => x.Subtitles)
    .ThenInclude(r => r.Fields)
    .ThenInclude(r => r.OptionSources)
    .ThenInclude(r => r.OptionsSourcesDetails)
    .Where(t=>t.Subtitles.Fields.Any(x => x.TemplatesFields.TemplateID==TemplateID))
    .ToListAsync();

Answer 2

来自This：

不支持在 Include 或 IncludeThen 中过滤。使用 Select 创建投影：

questionnaire = _context.Questionnaires
.Select(n => new Questionnaire
{
    Id = n.Id,
    Name = n.Name,
    Questions = n.Questions.Select(q => new Question
    {
       Id = q.Id,
       Text = q.Text,
       Answers = q.Where(a => a.UserId == userId).ToList()
    }).ToList()
})
.FirstOrDefault(qn => qn.Id == questionnaireId);